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Opa1612 vs opa1642 forum

Opa1612 vs opa1642 forum. It sounds fine, just slightly better than my HTC Desire 820 Dual SIM. opa1612 is a nice unity gain stable opamp that does reasonably well as a buffer as well as in the VAS, reasonably priced etc. A true FET input stage is incorporated to provide excellent sound quality and speed for exceptional audio performance. Thread starter wyn palmer; Start date Aug 3, 2019 The output amp could, for example, be an OPA1611 and the buffer amps OPA1612. 3. @raoultrifan Dude I gonna pick up the Opa1612 next purchase but the OPA1652AIDR was 2 bucks cheaper and well let’s not be pc OPA1642. Oct 2, 2021 #6 I would agree, that if there is an audible difference it will come form gain bandwidth. There's much discussion on the internet audio forums about the best opamp to use. The original amp has the OPA1656 and the other has the OPA1642. 试下opa1642. - high levels of DC precision are generally not required by audio customers (audio equipment makers). The current noise paired Which of the two mentioned OP Amps (OPA1612 or OPA1656) is the better one, in a scientific point of view. Last edited: Jan 3, 2023. (Page 4) But temperature condition of Electrical Characteristics is -40C to 125C, and dV OS /dT, I B over temperature, I Q over Temperature is specified at -40C ro 125C. TL072 is not in the same league, I replaced those decades ago already for better performing types. Turntables . 08 @ Mouser). try the new OPA1642. 5 VVS+ + 0. The OPA1642, Sometime I use OPA1612, OPA1642 and OPA1622. This op amps offer rail-to-rail output swing to within 200 mV of the power supplies with a 2-kΩ load, which increases headroom and maximizes dynamic range. 75us TC in input stage to optimize overload characteristic- approx. 다음 번엔 opa1612의 변환기판을 바꿔서 다시 들어보는 거랑 이번에 소개 못한 opa1642의 소리 평을 들고 오겠습니다. I bought the Master because it uses the same op amp as the Z8 (OPA1612). Search previously answered questions or ask our product application engineers a new question. Close to zero DC mv at its output would enable removal of the dreaded electrolytic coupling caps which will definitely lower colouration and Site Site Announcements Forum Problems & Feedback Terms and Rules. Sometimes the company decides to go from two letters to three in the part number and parts get stuck in the middle. 0 2280 protocol, up to 4TB Gode I've read good things about the OPA1642 in the super long CNC thread. Just set up your OPA1612 model having using the 5 pins in the order listed - as you would for the OPA1611 single op amp. The OPA1641 (single), OPA1642 (dual), and OPA1644 (quad) series are JFET-input, ultralow distortion, low-noise operational amplifiers fully specified for audio applications. Pin can be left floating or connected to any voltage between (V–) The OPA1602 and OPA1604 bipolar-input operational amplifiers achieve very low 2. 5 V. It appears that the OPA1611/2 have a lower noise Here’s a great article comparing opa2156 CMO vs opa1612. Oct 2, 2021 #24 audio2design said: ( the others I tried: opa1642 opa2134 and opa1612 ) Last edited: Oct 2, 2021. Just did an A/B with 2 opamp buffers on my Hypex NC500 monoblocks, which I normally use with no buffer, He talked to me about OPA1611's versus OPA134's as well as the OPA1612's versus OPA2134's. Funny you should ask Part Number: OPA1612 Other Parts Discussed in Thread: OPA2134, , OPA1678. Meanwhile we isolated the symmetric stage by pulling the input with 10kOhm to gnd. 000015% VS OPA1642 on the standard DMP-A6 THD+N vs Frequency (2-k Ω Load) OPA1677 , OPA1678 , OPA1679 SBOS855E – JANUARY 2017 – REVISED DECEMBER 2022 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. Power Supply: Low noise, high quality switching power supplies. Customer support center . It ensures a very low noise density of 1. Part Number: OPA1612 请问如何设计才能达到符合预期的THD+N性能指标？避免以低性能运行？ 一、比如用在一个10倍放大的线路中，作为正相放大，正相输入端可以悬空接信号输入还是需要并联电阻接地？需要的话电阻取值多大合适，反馈电阻和反相端接地电阻取多大比较合适？ I am designing A DAC analog stage using the OPA1602. Compared to OPA1612 however it's a toss. It is actually a complementary. 540B1536-57EA-4D11-A9B2-BD108CBD6A76. Forum Donor. 5 ~ +36 / ±2. In note slyt630. These three Op-Amps sounds great. I don't like the sound of opa1642. DIY (Do-It-Yourself) Discussions. In this case I would like to The OPA1611 (single) and OPA1612 (dual) bipolar-input operational amplifiers achieve very low 1. The OPA 627 is well over price and is bass heavy and it’s not worth the price you pay for it The OPA1612 and OPA827 are much better than any of these but these are SOIC and you’ll need an adapter with experience soldering skills. Best performing sample I have is a TL082CP vintage National Semiconductor by the way. As mentioned previously the OPA2134 in BIFET is a decent performer. Enjoy Free Shipping Worldwide! Limited Time Sale Easy OPA1611（单通道）和 OPA1612（双通道）双极型输入运算放大器在 1kHz 时可实现很低的噪声密度 (1. (Normally one would probably point to LM4562 as being the best compromise, but I think the Quiescent Current of 10mA is OPA1611, OPA1612 www. We changed the OPA1642 by the OPA1652, no change, the popcorn noise is still there. Furthermore, this OPA features rail-to-rail output switching at Forums. Audio, Audio, Audio! Amplifiers, Phono preamp, and Analog Audio Review The picture shows my op-amp rolling, I have tried the ne5532, opa1612, lm4562 and opa1642. Very nice presentation in the link! Thank you. The OPA1641, OPA1642, and OPA1644 rail-to-rail output swing allows increased headroom, making these devices ideal for use in any audio circuit. 0Vrms output single ended. The Vendor's Bazaar forum is for commercial offers and transactions. The second stage is set up to provide gain anywhere from 1/10*Vin to 333*Vin. It's FET, mainly specified for audio, very low distortion (especially for a FET opamp!), low supply current (1. For example, Aol for the OPA1656 with a 600 ohm load will have a linear output swing that is 1. You can dig on the Internet and find modern op-amp test results, but it quickly crosses over into sonic character and subjective opinion. Pin can be left floating or connected to any voltage between (V–) The OPA1662 (dual) and OPA1664 (quad) series of bipolar-input operational amplifiers achieve a low 3. OPA1612A OPA1612AID OPA1612 OPA1611 OPA1612AQDRQ1 OPA1662 OPA1632D OPA1662AID OPA1602AID OPA1611AID OPA1652 OPA1642 OPA1632 OPA1612AIDR OPA1641 OPA1602DR OPA1632DG4 OPA1642AID OPA1652AID To accomplish this, I designed this schematic using the OPA1642 audio op amps. 魅族mx4pro运放芯片用的是1612，而xplay 3s用2604，不知道魅族能不能比vivo更屌呢？ 貌似老外们觉得2604比较好有助攻的么 OPA1612 与 OPA2604 对比？ AMB Laboratories DIY Audio Forums. Clock System – Accusilion Femtosecond oscillators with noise reduction and improved jitter VS high precision crystal oscillators on the standard DMP-A6 3. The OPA1622 is a slow device compared to the OPA1612/OPA1656. The data sheet is very handy for audio designers working with 600Ω loads, but also presents apparently conflicting specs, and lacks 2KΩ load data. Much more detailed HF eliminating listening fatigue. For OPA1642, the output current (limit) appears to OPA1612到了后，自己先试了试OPA1612+JRC5532，感觉和OPA1642+JRC5532没什么区别，我试了好些碟，也试不出来什么区别；三频几乎没有差别，打分还是一样的，90分水平； Part Number: OPA1642 Other Parts Discussed in Thread: TLE2426, , OPA1656, JFE150, JFE2140, OPA1612, LME49720, OPA891. Mar 27, 2023 #1 Hypex NCx500 Power Specs (1kHz, THD = 1%): - 700w @ 2ohm (peak) - 700w @ 4ohm (peak) - Buckeye buffer stage (OPA1612 OP Amp), allowing for Low/Med/High gain settings via toggle switch on the rear. We tried OPA1612, OPA1656, NE5532, and Muses 8920 opamps in Rohm BD34301EKV Evaluation Board (which came with 5532's installed). The OPA1612 is a bipolar IC while it's brother the OPA1642 is a JFET. opa1642 is a real JFET. Opa2156 sounds a little more "detailed" and a little "grainy" in comparison. You could also consider OPA1652 as another option here. . 00005% at 1 kHz. My own conclusions with Speed is an issue, though. 00003% at 1kHz. The Now i tested opa1612 with lme49720 and 1612 is better in my opinion. 2. 2 nd: We notice popcorn noise (symmetric stage), change the OPA1642 and the popcorn noise doesn’t disappear. As the title says: What are the good general purpose audio op-amps these days? Last time I did anything audio-related I would've reached for the NE5532 & friends, but I assume better devices have appeared in the last 20+ years I'm toying with the idea of building a couple of custom small audio mixers for basic sound reinforcement / THD+Noise vs Frequency 3 Description The OPA134, OPA2134, and OPA4134 (OPAx134) series are ultra-low distortion, low-noise operational amplifiers fully specified for audio applications. I know well the opa1612 in the output stage of DAC and while it is good I prefer the sound of AD4898-2 for that application. This device operates over a very wide supply range of ±2. This device also has a high output drive capability of ±30 mA. pdf (sorry, pasting the address makes a huge link) you use a - LMP8672 (probably discontinued) - OPA1612 (which is barely available in SOIC8 at the moment) - ADA4898-2 - OPA1656 (if the circuit around it is right, it performs like opamps which are much more expensive, because of the FET Input stage it doesn't produce so much noise even with higher resistor values on its inputs) - AD8599 ( not a 电子发烧友网为你提供ti(ti)opa1642相关产品参数、数据手册，更有opa1642的引脚图、接线图、封装手册、中文资料、英文资料，opa1642真值表，opa1642管脚等资料，希望可以帮助到广大的电子工程师们。 We would like to show you a description here but the site won’t allow us. 3V inside of each supply. I seem to recall that the OPA1642 is newer than the OPA1612. It could be very interesting to test their performance: - SNR - The OPA1611 (single) and OPA1612 (dual) bipolar-input operational amplifiers achieve very low 1. The output swing for Aol should be considered as it is different between the two devices. 2 NVME 3. OPA1612 on paper has lower voltage noise but whether its lower noise Tubey, better late than never - I just replaced all NE5532 amps in Benchmark DAC1 with OPA1612 and play it so far for few hours. Hello guys, About half a year ago I decided to design my own high performance headphone amplifier. The idea came more from some kind of engineering challenge rather than serious need - my O2 was probably more than enough. My designs considerations were pretty simple: The Audiophonics OPA1612 operational amplifier is based on an authentic Texas Instruments 1612 chip. 000 (DIY!) tube preamp with Forum Home Amplifiers Solid State Pass Labs Tubes / Valves Chip Amps Class D Power Supplies Headphone Systems. OPA1612, OPA1642 and good old NE5532/5534A will do everything you ever need - perhaps not what you think you need, but perform well above human perception limits. 000015%)。OPA1611 和 OPA1612 在 2-kΩ 负载下能够提供摆幅在距离电源轨 600mV 的范围内的轨到轨输出，这有助于实现动态范围最大化。 The LME's should work well in the EQ stages but I would install machine sockets and compare the noise of the LME vs. 1-nV/√Hz and an extremely low distortion level of 0. i expected Products Precision op amps (Vos<1mV) INA1620 — High-fidelity audio operational amplifier with integrated thin-film resistors and EMI filtering OPA130 — Single, 1-MHz, 20-pA bias current, 530-µA power, FET operational amplifier OPA131 — Single, 4-MHz, 50-pA bias current, 750-µA power, FET operational amplifier OPA140 — Single-channel, 11-MHz, Stability should be considered especially with the wider bandwidth of the OPA1656. 3 nV/√ Hz noise density with an ultralow distortion of 0. OPA1642 Datasheet. The OPA1656 is the industry’s lowest voltage noise high voltage CMOS on Is the OPA1612 good enough to feed into an external amp? It's in the Fiio K3s but I want to use it as a standalone DAC MASH covers a few different number of bits in the output - the DAC output could just be switches. 不过，大学同学推荐我试试opa1642这块片子，据他说非常好。不过这个片子是贴片的，需要买焊好的贴片转直插的才行。不过就算加上转直插的电路板后价格也就9元，于是买回来试了试。 经同学推荐，自己又买了两块opa1612，想看看这个系列的组合能 2. And bias current vs common-mode voltage has a slope that adds distortion (H2) when source impedance isn't super low and well balanced while OPA2156 doesn't have that problem (but may have nonlinear capacitance vs CM voltage unless the input Not to sure whether its still available, you can register with Brown Burr on the Texas Instrument site and provided you are doing R&D not for military purposes, you can order the OPA1612, OPA1642 on SOIC devices free as SAMPLE for R&D and place them on an adaptor that converts from SOIC to dip 8. Featured Vendors Even better, try the OPA1612 (if input current isn't a big problem). Last edited: Aug 4, 2019. Trying a second OPA1642 the popcorn noise is still there. by changing the different opamps in audio gear. OPA2134 is basic hi quality Op-Amp and all rounder Op-Amp with great The OPA1642 has much lower current noise and better 1/f noise than the OPA1656. Low- and Mid-Frequency Test Signals for Evaluation of Room Modes // Measurements: Public challenge on AVS Forum on differences between 24 bit/96 kHz and CD rate with content from AIX: foo_abx 1. The OPA1622 offers extremely-high ac PSRR and CMRR specifications that eliminate noise from power supplies, making the OPA1622 プライバシーポリシー 当サイトでは、以下のとおり個人情報保護方針を定め、個人情報保護の仕組みを構築し、個人情報保護の重要性の認識と取組みを徹底することにより、個人情報の保護を推進致します。 The Vendor's Bazaar forum is for commercial offers and transactions. Opa1642 sounds a bit smoother and silky at top end but a little bit fat in the mids. 000015%: OPA164: OPA1642. The OPA1612 op amp is Zero. Joined Feb 29 The OPA1612 and OPA1642, distortion is much better. At least it is my preference when associated with an AK-449x DAC. It has OPA2604 buffer amps that many have replaced with dual OPA627BP's with good results. cant really remember ad815, but plenty of experience with opa1612 and opa1632. If you really feel the need for something faster, look at ADA4898-2 or ADA4896-2 (+/-5V supplies max). Additionally the OPA1642 sounds fine to me with the PCM1793 chip. Español $ USD United States. You are right, OPA1656 is interesting part, but as anything in engineering field it depends on user case and circuit environment. Especially in a We would like to show you a description here but the site won’t allow us. 1-nV/√Hz as well as an extremely low distortion level of 0. Contact Mouser (USA) (800) 346-6873 | Feedback. 5 mA The advantages of the SiGe process used in the BUF634A are pretty obvious. My statements were verified: - OPA1611/1612 are optimized for better distortion than the OPA211 (already pretty good). While it still has some treble sparkle, It isn't enough to save its sound of complete mudyness and lack OPA1611, OPA1612 www. I too find that the OPA1612 and OPA1642 are fantastic upgrade/replacements in a whole lot of professional and consumer audio gear out there equipped with comparatively The OPA1642 is the best choice that you can make other than incredibly expensive ones that provide very, very, slightly less noise and higher distortion. 8mA per OP Amp Rolling: the Philips CD753 (aka Marantz CD5000) with MUSES8820 vs OPA1692 vs LME49723 and Others - an article by Paul Hunting on TNT-Audio, Internet HiFi magazine, www. SSD: M. Several reference are used on forum. The DC feedback amps are a TL052ACP. Reactions: TheWalkman. Output Current characteristic curves seem to behave in opposite manners. This configuration is best for use in setups with a I am designing a IV stage and summing using opa1612. PA Op Amp The Vendor's Bazaar forum is for commercial offers and transactions. Musician and DIY builder Expert in loudspeaker installation for optimal pace, rythm and dynamics. 5nV/√ Hz noise density with an ultralow distortion of 0. Any way, it is also Products Precision op amps (Vos<1mV) INA1620 — High-fidelity audio operational amplifier with integrated thin-film resistors and EMI filtering OPA130 — Single, 1-MHz, 20-pA bias current, 530-µA power, FET operational amplifier OPA131 — Single, 4-MHz, 50-pA bias current, 750-µA power, FET operational amplifier OPA140 — Single-channel, 11-MHz, OPA2192 being my favorite CMOS opamp and OPA2209 my favorite bipolar alongside OPA1612. (Page 6) Optional parallel input amps-2x LT1115/AD797/OPA1611 or OPA1612 for MC 2x OPA1641 or similar or OPA1656/OPA1642 for MM Cartridge load components can be altered without soldering. The OPA1642 for instance has a diff input voltage max to the supplies. The OPA2134, in comparison to OPA1612, is more detailed but perhpas shrowded. opa1602, opa1612. I talked to a TI/B-B applications engineer today. For some reason I refuse to use it as often as I can though, being CMOS. 1nV/sqrt(Hz) and 0. Hi all, Tried few OPAMPs myself in I/V, LPF, VAS and BUFFER stages with my Essence One DAC/headamp, like: NE5532, LM4562, NJR2114, OPA1602, LME49720, MUSES8820, MUSES8920, OPA2604, OPA1642, OPA2132PA, AD8672, AD8599, MUSES01, MUSES02. The op amp. The IV stage was changed so from my DAC I get a 2. Need applications or design support on a specific part number? Part number not found. OPA1622 SoundPlus High-Fidelity, Bipolar-Input, Audio Operational Lead finish/ I have replaced an OPA1611 in the second stage of a MC preamp with an OPA1642 + adapter with no problems, and I've replaced an LT1115/AD797 in the front end of the same preamp with an OPA1612 + adapter with no problems. Forum Home Amplifiers Solid State Pass Labs Tubes / Valves Chip Amps Class D Power Supplies Headphone Systems. 0Vrms. Low end: NJM2068 NJM2114 I'm thinking OPA1642 or NJM2068 at the input and OPA1612 or OPA1642 at the output could be an awesome setup. They'll say the OPA2134 "sounds dark" for example. I like the OPA1642 due to its MUCH reduced bandwidth compared to the 1656 (11MHz vs, 55 MHz)---thus much less chance of oscillation in vintage circuits. Perhaps it's a further development. Dear TI E2E support, Hi there, Our team made a prototype of a phono We would like to show you a description here but the site won’t allow us. I took out the Audio Jade AD797BR from my Zishan Z1 because it's too dark. Replacing the lesser quality opamps in another Technics player with the OPA1642, the improvements were noticed right away, even was better to my ears over the other identical Technics player Hi, can I use OPA1612 as input buffer for audio application? I'm trying to understand if the input diodes can cause some problem to the audio signal. 2 2014/07/10 If I could also request test of: OPA1642 ~ 2 Euro OPA1656 ~ 2. thuanth Posts: 5 Likes: 1 post Liked in: 0 post Joined: February 16th, 2018, 3:27 am Location: California Country: Top. Please confirm your currency selection: Mouser Electronics - Electronic Components Distributor. 000015% at 1kHz. We made 10 units of the same, of which 5 units failed OPA 1642. opa1642 and opa1656 as I can in a small headphones amp design. I'll check The TI OPA1612 dual operational amplifier benefits from excellent technical characteristics, allowing very good electrical and audio performance. --lme49722 lme4562 lm4562 opamp The OPA1612 offers rail-to-rail output swing to within 600 mV with a 2 kΩ load, which increases headroom and maximizes dynamic range. No the Mercedes runs on diesel. Pin can be left floating or connected to any voltage between (V–) OPA1612-Q1: 1Mb / 31P [Old version datasheet] SoundPlus High-Performance, Bipolar-Input Audio Operational Amplifier Burr-Brown (TI) OPA134_071: 403Kb / 14P: High Performance AUDIO OPERATIONAL AMPLIFIERS OPA134: 432Kb / 14P: High Performance AUDIO OPERATIONAL AMPLIFIERS More results. View all forum topics. Forums. I have no regrets but in your case, I'd just buy the regular version and Part Number: OPA2210 Other Parts Discussed in Thread: LM4562, , INA1620, OPA1622, OPA1656, OPA828, OPA1642, OPA1678, OPA1612, BUF634A Pardon if any of the following has been covered. Aol OPA1612 VS MUSE02 ทั้งคู่เป็น BiPolar เหมือนกัน เสียงต่างกันไม่มากนัก OPA1612 เสียงจะสว่าง และ สะอาดกว่า ส่วน MUSE02 เสียงกลางจะมีน้ำหนักกว่า The Vendor's Bazaar forum is for commercial offers and transactions. 6mA: 140dB: 120dB: 0. 6 mA but I know I’m in the Op amp thread so I don’t want to take the thread off topic. BTW, last year I crippled my €4. We do not vet any members. The next op-amp I am planning to try is the OPA1612 but perhaps the DAC is the limiting factor and perhaps the measurements will look very similar to the OPA2134 even if the OPA1612 is a really good op-amp. jpeg. The new breed of TI J-Fet opamps offer superior performance to that old soldier the OPA2134. 5 Euro OP275 ~ 3 Euro OPA1612 ~ 6 Euro According to specs I would think the OPA1642 would be one of the best compromises cost vs performance wise. My output is single ended 2Vrms . OPA1622 SoundPlus High-Fidelity, Bipolar-Input, Audio Operational Lead finish/ AudioKarma Audio Forums. If a transient causes the op amp inputs to be pulled apart, the differential input voltage forward-biases those diodes causing a large input bias current. My first tests were with an OPA1612 (equivalent to OPA2211) in the instrumentation stage, but I didn't manage to get the circuit ringing free under all circumstances due to sloppy wiring, decoupling and grounding. The OPA1611 (single) and OPA1612 (dual) bipolar-input operational amplifiers achieve very low 1. I was wondering if the OPA2604's could be replace with a dual opamp like the OPA1612 with similar or hopefully better results than the OPA627's The OPA1611 and OPA1612 offer rail-to-rail output swing to within 600 mV with a 2-kΩ load, which increases headroom and maximizes dynamic range. Extensive listening test showed me that the best sounding result was with the lm4562. The AD opamp is more expensive though than the OPA1612. opa1612 与 . Frequency (Hz) Voltage Noise Density (nV/ Hz) 1 10 100 10 100 1k 10k 100k 1M 10M C020 + + ± ± Treble Bass +15-15 1/2 OPA1656 1/2 OPA1656 Input Output Pad Product Forum Home Amplifiers Solid State Pass Labs Tubes / Valves Chip Amps Class D Power Supplies that some of the high-end Op-Amps are hitting distortion and noise figures that i would think is hard to beat like the OPA1612 with its 1. Misc. Depending on the actual application circuit, there are alternatives with better noise performance. The OPA1612 (2. the BB OPA1642 and OPA1612. Thanks, Sherlon Kauffman. e. I got by far the best sound with the Muses 02. If you'd prefer to use a bipolar The following two sets of Output Voltage vs. Source & Line Analogue Source Analog Line Level Digital Source Digital Line Level PC Based. The OPA169x operational amplifiers achieve a new level of performance for low-power amplifiers with a low 4. Therefore, the OPA1612 simulation model really only contains one op amp having the pin order of the single OPA1611 op amp. 000015% I really like the OPA1642 in the Z8 so if the use of it in the Master vs. 8 bucks for a genuine part. 5 V IN+, IN− current –10 10 mA OUT+, OUT− current –50 50 mA Output short-circuit(4) Continuous TA Operating Temperature –40 150 °C TJ Junction Temperature –40 175 °C Tstg Storage Temperature –65 150 °C (1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. NE5532 is a very good Prodigy 205 points. At this point noise and ultra low noise supplies might be the last area I should put more effort into for this interface. Rolling opa1642, opa1612, muses8920, 2xopa627bp, lme49720na, opa2134. Headphone output stage is basically a Cmoy operating at single supply 3. 输出部分则选用了两片时下美国德州仪器出产的最受发烧友好评的发烧运放opa1612，opa1612是ti推出的一款性能相当优异、双通道、双极输入音频运算放大器。 胆味和醇厚绵密的味道，输出端还特别增加了一枚ti新构架的场效应jfet音频专用的发烧运放opa1642，该运 After working with some OPA1612 on my recent Topping PA5 D01 Module replacement project (at ASR), a friend sent me a few OPA1612 opamps he ordered when they were in stock since i couldnt get them anywhere. I ordered OPA2365 to replace OPA1642, OPA140, and OPA827 all use a similar FET front end, designed not to exhibit the nonlinear junction capacitance that classical FET input architectures do. Hi Community, TI!!! I would like to upgrade an audio amplifier OPA2134 and the TI site web recommands me to change for a new OPA. Opa1642 4. ). My phono preamp, bye the way, uses OPA1611/1612 and OPA1641/1642s- amongst others. Part Number: OPA1656. Marketplace Home. Actually, the OPA1612 and OPA1688 are available in SO-8, not bad. OPA1612 1612 will sound warmer, thicker, mellower and darker with most headphones and IEMs. consists of 2 x 10 op-amps in parallel and the two I'll look at it if you know of one amp using OPA1612 sounding audibly better than another amp using cheaper op amp in objective listening comparison. Reports are that both should produce great sound. The higher current drive of the OPA2822 Even the Voltage noise spectral density curve in the OPA1612 datasheet figure 32 shows lower noise when the source resistance is low. It might require more capacitance in the LPF of the I/V stage to keep it happy Vs the others. It's best use as an alternative to opa1612 when noise is not a big concern. The OPA1642 is “one step down” but still very highly rated, and it is JFET-input which should give a low enough DC-offset to be used directly in this kind of application. OPA Chips – OPA1612 with ultra-low noise and low distortion 1KHz 0. The OPA1662 and OPA1664 series of op amps offer rail-to-rail output swing to within 600 mV with 2-kΩ load, which increases headroom and maximizes dynamic range. Precision Operational Amplifier OPA1612 TI E2E™ forums with technical support from TI engineers. It has to do with the load capacity limitation be under a certain load The OPA1641, OPA1642, and OPA1644 series of operational amplifiers are unity-gain stable and provide excellent dynamic behavior over a wide range of load conditions. Joined Sep 4, 2021 Messages 9,056 Likes 15,511 Location UK/Cheshire. The single of the OPA1612 is the OPA1611. Below is a comparison between OPA1656 and OPA1642. And Specified range is -40C to 125C as follows. if using it alone its the better choice, but if there is a buffer afterwards to drive the headphones, or you are using them for line out, I have interested in low ESR Electrolytic Capacitors to power the Opa1612. Every amp. 1mV: 60000pA: 114dB: 40MHz: OPA1641: 1: 0. The OPA1602 and OPA1604 bipolar-input operational amplifiers achieve very low 2. You will need to ad a pair of . After confirming the fault condition Three pins of Pin 8 + Supply, Pin 5 + INPUT, and Pin 4 - Supply were short-circuited inside TI’s LME49860 is a 2-channel, 44-V, high-fidelity, high-performance audio op amp. OPA1642 - Improved clarity, dynamics and soundstaging. The dual and quad versions feature completely independent circuitry for lowest crosstalk and freedom from interactions between channels, even when overdriven or overloaded. We would like to show you a description here but the site won’t allow us. It's made on the same process as OPA1612, OPA1642, OPA1622, OPA1692, and many others. alongside with some aliexpress el`cheapos for like 2 buck a piece instead of 7. Two cases were evalutated – in a The OPA2134 is very ordinary, I consider it a side step to the NE5532. So, parts are not spec'ed for or The thread was started in 2014. 2 mA BUF634A Wide Bandwidth Mode: 210 MHz / 8. BJT-inputs without bias current cancellation (OPA1622), Super-Beta BJTs (OPA2210), Low voltage noise JFET and CMOS (OPA1642, OPA827, OPA828, OPA1656/2156). Two identical gain 11 amplifiers were tested. If thats not the case this forum would not exist 1 10 100 1000 1 10 100 1k 10k 100k 1M 10M 9ROWDJH1RLVH6SHFWUDO'HQVLW\ Q9 ¥+] Frequency (Hz) C006 Product Folder Sample & Buy Technical Documents Tools & Software The OPA1612 does not seem to have the process contamination of the LM497X0 that produces rocky-sounding noise. From what I know the OPA1656 is currently the highest-spec audio grade standard opamp that TI offers. When I do serious listening test between them, just an A - B testing, not back and forth, I found the OPA1642 creates more noise at upper frequency because of those high frequency details. But over time, i tryed lme49722 opa2134 and opa1612 ,--. Sound is more "color", and "massive". For example the OPA1678 has a much higher gain-bandwidth product than TL072 and different output impedance, which means that the criteria for it being stable (i. TI 5532P vs ST TL02CN Inverting configuration Gain=10 Output=1VRMS across 2kΩ Load. The data sheet claims each OPA1612 uses 7. OPA1612, OPA2211, LME49720HA, OPA2111, AD746 (class A), AD8620, AD8066, OPA2228, I read on several forum the advantage to use specific AOP for the final stage of DAC or Amplifier. 8-nV/√ Hz noise density with an ultralow THD+N of –119. The OPA1642, however, is also LESS expensive ($2. No experience with the 1612 but the 1642 is super. 18 I have an Onix XCD-99 which is basically a Music Hall CD-25. The reality is it probably isn't audible difference vs. If you have guitar related questions, start with the "search" field at the top of the page. The OPA1612 has lower noise and distortion The OPA1641, OPA1642, and OPA1644 series of operational amplifiers are unity-gain stable and provide excellent dynamic behavior over a wide range of load conditions. 000015% VS OPA1642 on the standard DMP-A6 Hi Ervin, Yes those devices are very popular, unfortunately I don't have any way to know for sure when they are back in stock. 2 dB at 1 kHz, while driving a 32-Ω load at 100-mW output power. Some members in the Pass Labs forum section used my design in their First Watt clones with the same conclusion. Buy AkLIAM Original TI BB OPA1612 OPA1611 Classic Op Amp for DAC Headphone Amplifier at Aliexpress for . Manufacturer: Texas Instruments. Ne5532 then the opa1642 was the winner. has slightly less voltage noise but also slightly more current noise; slightly faster and less THD, but worse CMRR. 9 nV/√Hz at 10 kHz Other Parts Discussed in Thread: OPA1642 , OPA1622 大家好。我使用OPA1642+OPA1622搭建了一个简单耳放电路，OPA1642接电流输出型dac作IV转换，OPA1622作差分运放接耳机负载。我发现音频段内所有频率都会有很大的失真，不知道问题出在哪里，还请工程师帮忙看一下 Here’s a great article comparing opa2156 CMO vs opa1612. Just check the rails aren't over +/-18V. It's especially difficult to test the mod in an active speaker scientifically (since there's no output where you can simply measure THD etc. English. I kept the test output level at 0dBV to avoid visible THD contribution from the sound card. OP . OPA2228 and OPA1612 over OPA1642 because of the input noise that makes it sound less pristine. how about the sound of opa1612? I don't have it yet, it is cheaper than using 2 opa1611. Audio, Audio, Audio! DACs, Streamers, Servers, Players, Audio Interface. If soldering surface mount isn't your thing you can order them presoldered from the The OPA1642 has more open at the high frequency, it is more detail but it noticeable sharp and edgy sound. Skip to Main Content (800) 346-6873. All five op amps have more than half the noise compared to the NJM4560. wyn palmer Super But usually I do this on more technical forum. 7 pA/rthz) will multiply with the pickup resistance (varies quite a bit, say typical is 10 The OPA 1642 is adopted for this circuit. LME49720 sound is boringand too light. 之前Opa2211x2+Opa1642那個組合用左半年左右，幾星期前IV轉用左2粒Opa1612，即是Opa1612x2+Opa1642。 而家諗緊好唔好試Opa2211x2+Opa1612，估計聽喇叭時會清過Opa1642做RCA的LPF。 Forum Donor. Of course on summing I want to have the same 2. 1 uf mono ceramic caps from pin's 4 and 8 to a nearby ground point to stabilize those wideband opamps. Jim Williams Audio Upgrades Access to members-only sub forum discussions; Access to members-only Chat Room; Get INSTANT ACCESS to the world's best private pro audio Classifieds for only USD $20/year; The OPA1622, dual, bipolar-input, SoundPlus™ audio operational amplifier achieves a very low, 2. 25 ~ ±18: 55mA: 3. 6 mA of supply current per channel. PRODUCTION DATA. If a FET-input amplifier is required There's no shortage of candidates here, and the new OPA1656 is a great option, but you could also check out: OPA1642, OPA1678, OPA827, and the newer OPA1642, or OPA1688 are good choices for a FET or CMOS op amp in this application. The OPA1641, OPA1642, and OPA1644 series of operational amplifiers are unity-gain stable and provide excellent dynamic behavior over a wide range of load conditions. See the LM4562 vs Better choices include LME49720, OPA2211, AD8599, OPA1642, AD8512, OPA1612, etc. Newest offerings from National and Linear both lost to the TI's. JFET-Input Audio Op Amps OPA1642 TI E2E™ forums with technical support from It's a killer OpAmp, and better suited to non-inverting buffer duties than the OPA1612/2211 . Re: OPA1656 instead of OPA1612. TI E2E™ design support forums . com OPA1612, MUSES8820, OPA1692, LME49723 and the NJM8801. Reactions: Schlippwhip68. -Category Forums. com SBOS450C –JULY 2009–REVISED AUGUST 2014 5 Pin Configuration and Functions D Package OPA1611, SOIC-8 D Package (Top View) OPA1612, SOIC-8 (Top View) DRG Package OPA1612, SON-8 (Top View) (1) NC denotes no internal connection. Last edited: 2010-01-19 1:33 pm Just measured a couple of examples to illustrate your argument. by amb » January 27th, 2024, 10:37 pm . if 802 is LM833, its bjt input isn't suited to the circuit OPA2134 is probably a good choice in general. Referring to fig 37 from datasheet , I understand that to have unity gain I have to change the R330 to 680. I must In SMT the OPA1612, rated at 40V absolute maximum, is a very good part. opa1642 is actually really good. Description: High-Performance, JFET-Input AUDIO OPERATIONAL AMPLIFIERS. If there is a difrence , how many DB do I gain by using +- 15V vs +- 5V OPA1642 (JFET but otherwise similar to the 1612) These will have to be mounted on browndog adapters. It provides a very low noise density of 1. Of Part Number: OPA1612-Q1 Hello, OPA1612-Q1 datasheet explain that Specified temperature range is -40C to 85C. For high source impedance sensors such as a phono cartridge lower current noise is better. ti. Some seem to like it used in combo with he OPA1612. " but I think Forum Home Amplifiers Solid State Pass Labs Tubes / Valves Chip Amps Class D Power Supplies Headphone Systems. Opa1656 has I'm currently using the OPA1612 and OPA1642 in combo with my phono pre and like the sound. maybe, but unlikely and that wouldn't matter to you if you use outboard DAC. Access to members-only sub forum discussions; Opa1612 ( sounded almost as good as lm4562, very small difference ) 3. 00003% @ 2k欧, VS=± 15V 压摆率: 20V/μs 增益带宽: 55MHz 因为稳压板加调压板坏了，只能用电池供电，18V的高压下，听到了各种直流信号，和手机信号的干扰，但还是能听出这个顶级运放的基本声音的。。。 主要感觉就是顶级白 Unpopular opinion- If you are talking about measured performance in the audio band, it probably is OPA1612 or LME49720. I don't care about listening tests or something else, just These are probably among the two highest of the best sounding dual opamps around today. Since I am a novice, I am assuming that the current specification is for unity gain applications? 이번에는 opa1612, ad8620을 들어보고, 원래 끼워져있던 muses8820과 비교를 해보게 됐습니다. Attachments. For DAC-output IV Forum Donor. (for leaded packages at least) can be improved by placing output between +/- VS pins giving smaller loop area for output current I've also seen soic types with common connected feedback OPA165x Ultra-Low-Noise, Low-Distortion, FET-Input, Burr-Brown™ Audio Operational Amplifiers 1 Features • Ultra-low noise: – Voltage noise: 2. Then I also experience the mid range of this In places less hospitable to LME49720, OPA1612 has proven to be a very useful opamp for dac I/V and or differential summing. 随着智能手机和平板电脑的高速发展，便携式高保真（Hi-Fi）音频市场的需求与之增长。无论是消费者还是做Hi-Fi的商家，都希望产品拥有更高的输出功率，并且保持低失真率的运放，从而驱动各种耳机。目前市场上大部分产品采用的TI公司的OPA1612，虽然失真率很低，但是驱动能力不够强。 For a complete stereo setup, I will be using 30 OPA1612's with unity gain for the active crossover network and 8 OPA1612's for the parametric equalizer circuit which will have a 12 dB cut and gain. OPA1642 on adapter, make sure to check decoupling and make sure to check for oscillation. I think lmh6643 and opa1656/opa2156 have the lowest distortion at higher frequencies, 6643 probably even Mouser offers inventory, pricing, & datasheets for Texas Instruments OPA1612 Series Audio Amplifiers. The OPA1652 and OPA1654 op amps offer rail-to-rail output swing to within 800 mV with a 2-kΩ load, which increases headroom and maximizes dynamic range. I use the the 1641 in my Marchand XM44 to replace the OPA2134 as it is a JFET. Regards, Thomas OPA1612: 2: 0. The supply voltages are +/-12V and both are capable of supplying up to 1A currents. My question is (I cannot see it in the datesheet) for best THD+N , do I need to feed +- 15V or I can use +- 5V with no influence on THD+N . “ti从1985年至今，在音频领域已耕耘超过30年，从 到转换器，我们现在在业内的市场占有率接近30%。” 中国区模拟产品市场拓展经理信本伟表示，“无论是从技术、还是市场需求角度来看，ti最近都会有更大的动作。 “比如30多年前的opa2604、2134，到后来的opa627，以及近几年的opa1612，都是口碑非常好 The Vendor's Bazaar forum is for commercial offers and transactions. the best sounding is OPA1612 ,not for driving headphones -low output current drive ,3ma current consumption ---then opa2134 the best all around as preamplifier it can be used at high gain 6-10 times,very good sounding and Musical,good for biassing in class A. It's a toss up between the JFET input's higher noise vs their lower sensitivity to input OPA1642 was clearly beat by OPA1612 being more "rocky" and forward. Datasheet: 764Kb/21P. Only unmoderated members can post here. High gain opamp based preamp for low output MC cartridges. bipolarer Eingang OPA1611 — Energieeffizienter Präzisions-Operationsverstärker mit 1,1nV/√Hz Rauschen OPA1612 In my experience, the lower the noise the more 'air' in the soundstage so I would recommend OPA1642 its noise is way lower than OPA2604. the datasheet says that in "G = 1 circuit a fast ramping input signal can forward bias the diodes because the output of the amplifier cannot respond rapidly enough on the input ramp. Part #: OPA1642. it is recommended to be used in portable devices I/V stage because it has a input fet like the opa1612 and the opa1642. 1nV/√ Hz) 和超低失真 (0. This OPA has a rail-to-rail output toggle at 600mV with a 2K Ohm load, improving Hello everyone, I have the DAC Emotiva XDA-1 preamp with the DAC Analog Devices AD1955 and Burr Brown OPA-2134 op-amps, I want to update to the Burson Audio Play with the DAC: ESS Technology SABRE32 / ESS9018 and NE5532 X 3, NE554 X 2 op-amps, would it be a good update to the Burson Audio? thank you very much to all. Change Location. I found that OPA1612 was in the ultimate soundplus collection that's why i have change for it. Since the OPA1642/1641 Site Site Announcements Forum Problems & Feedback Terms and Rules. Which is slightly lower performance than the OPA1612 bipolar op amp. J. This feature, in combination It's easy to convince oneself of an improvement only to find out later that it actually was the opposite. In 2022 one would suggest OPA1642 and OPA1656 methinks. tnt-audio. 2-nV/√ Hz noise density and distortion of –127 dB at 1 kHz. Find parameters, ordering and quality information There are some things to watch out for when swapping op amps. Texas Instruments OPA1612 ระดับ วงจรขยายระบบเสียง มีจำหน่ายที่ Mouser Electronics Mouser ให้บริการสินค้าคงคลัง การประเมินราคา และใบข้อมูลสำหรับ Texas Instruments OPA1612 OPA1612/2211 has excellent CMRR but PSRR isn't stellar and strictly follows OLG. I almost went that way, but Parts Connexion has super low prices on the Forums. 00006% at 1 kHz. Next, OPA828 was evaluated as a gain or VAS section in a small A class power amplifier with extreme performance (2 MHz power bandwidth, 200 ns rise time, 0. In that case, for example, the Sparkos SS3602 opa1642 失真比opa2604低了十倍，音质非常好，三频均衡，音色甜美，无可否认的音频专用运放，jeft结构，关键价格非常便宜，一美金不到，看看这次大湿们还能说什么良品率什么渠道什么的了，不能说音质不好了吧，几个大湿本来手上就没有任何可以拿出来的器材和录音，看看这次还能说什么，想再 OPA1612 with ultra-low noise and low distortion 1KHz 0. I have not tested the OPA1612 with high value bias resistors to see if it has the latch-up/bias current correction start-up issues of the LME49720. Should I expect any improvement from the OPA1612? Thanks. Other Parts Discussed in Thread: OPA2134, OPA2604. lm4562 and opa1612 and I prefered LM 4562 in both Aiyima a07 and the tpa3251-based Aiyima a04. 2nV/rtHz), the OPA1642 which is a FET input op amp and then the newest part that is currently in development is the OPA1602. Last edited: 2020-10-05 9:04 pm More options MASH covers a few different number of bits in the output - the DAC output could just be switches if 802 is LM833, its bjt input isn't suited to the circuit filter/feedback impedances - really should be a jfet type OPA1642 looks good on paper, better when you read the chatter from TI engineer on the project I would worry that there simply isn't The diyaudio forum might be better suited for posing the question. Search the support knowledgebase; This leads me to believe there could be an issue caused by the back-to-back diodes across the inputs of bipolar (LME49990, OPA1612) and CMOS op amps (OPA1656). OPA1612 ---- 10 Hz OPA1642 ---- 20 Hz OPA1656 ---- 1 kHz OPA2162 ---- 1 kHz It also looks like the OPA1642 and OPA2162 are not happy driving 600 ohms, but the OPA1612 and OPA1656 are. 00005% AD8610 AD8620 Bandwidth Bias current CMRR Gain LM4562 LME49710 LME49720 LME49721 LME49722 LT1057 NE5532 Noise Offset voltage OPA134 OPA1612 OPA1602はOPA1612より1mA少ない OPA1602はUnity Gainでの安定度が高い。 OPA1612はOPA1602よりも安定度が悪いのでゲイン1以上で使ったほうがよさそう。 容量性負荷の場合，OPA1612はCfが必要。OPA1602にOPA1612と同じCfを取り付けると容量負荷でもオーバーシュートが出ない。 VS– – 0. This is a forum where guitarists, from novice to experienced, can explore the world of guitar through a variety of media and discussion. 000015%: 1. The OPA1611 and OPA1612 offer rail-to-rail output swing to within 600 mV with a 2-kΩ load, which increases headroom and maximizes dynamic range. The input stage is set up as a unity buffer with a bootstrap for high input resistance. However, many just read about a specific opamp that is the current I had the chance to gather up a selection of opamps from my parts bin, including BB OPA2604, OPA637, AD823, LME49860, JR4556, Muses8820 and 8920, and compare them against each other along with a Burson V6 Classic (thanks to them for sending me an evaluation). (opa1642를 샀는데 soic이 아니라 8-tssop이어서 망했습니다 Comparing the two parts: LME49600 Wide Bandwidth Mode: 180 MHz / 13. 0000x distortion and so on). With that in mind, matching source and feedback resistance is no longer as critical to ensure good distortion performance (as can be seen in Figure 37 in the OPA1642 datasheet). Welcome to r/guitar, a community devoted to the exchange of guitar related information. 000015% THD or the OPA1642 if JFET is the way to go. I'm not a big fan of the OPA1642 in general and didn't like it in EQs. They require a SOIC-8 to DIP-8 adapter though. diyAudio provides this forum for the convenience of our members, but makes no warranty nor assumes any responsibility. Manufacturer: Part # Datasheet: Description: Texas Instruments: OPA1642: 742Kb / 22P [Old version datasheet] High-Performance, JFET-Input AUDIO OPERATIONAL AMPLIFIERS OPA1642: 865Kb / 25P [Old version We have several very low noise audio op amps that would be good replacements for the JRC devices. OPA1612 is a great amplifier, however, it is bipolar (input type) and when used immediately at the front-end of a guitar input, the input current noise (1. 000015% at 1 kHz. OPA1612 with ultra-low noise and low distortion 1 KHz 0. My understand if noise isn’t a problem the opa1656 is great alternative to the opa1612. So, it is a different design and chip. These are SOIC8 size, but you can buy OPA1612 opamps on eBay pre-soldered on a SOIC to DIP adapter. Part Number: OPA1642 Other Parts Discussed in Thread: TL072, LM833, , OPA1656, OPA1655, OPA2156 I've just started working with the OPA1642A, and I want to use it in a basic audio buffer circuit. Originally we used OP 275, we adopted OPA 1642 for recent lot. 25 V to ±18 V, on only 3. OPA1612-Q1 Price, OPA1612-Q1 Stock, Buy OPA1612-Q1 from electronic components distributors. It is very airy, the bass and treble regions extension pretty well and overall it has a very neutral lively tonality. That should get you going. While improving on the flaws, some of the IC's SMD legs gave up and broke off. My main attraction to them is a higher ripple current in the AC to “ power” the board onward as the opa1612 only requires low quiescent current of 3. Try our site search. It has rail to rail differential The OPA1641 (single), OPA1642 (dual), and OPA1644 (quad) series are JFET-input, ultralow distortion, low-noise operational amplifiers fully specified for audio applications. Would the AR sound brighter? 高音質電源改善アクセサリーを中心に、音響を中心に電気で世の中に貢献しています。 总谐波失真(THD): 0. Digital To Analog (DAC) Reviews and Discussion (stock), opa2156, opa1656, opa1612 opa1642 opa2140 etc. the OPA1642 used the regular DMP-A6. Joined May 28, 2020 Messages 1,861 Likes 7,160. 4 report foobar2000 v1. W. But for MC phono pre-amps a low noise bipolar input op amp like the OPA1612 would give the best noise performance. Or perhaps it took the lessons learned on the 1612 and applied them during the design of the 1642. I have a China made DAC in which they used AD8397 for the headphone OUT. The OPA1602 and OPA1604 series of op amps offer rail-to-rail output swing to within 600mV with 2kΩ load, which increases headroom and maximizes dynamic range. not going into high frequency oscillation) are different and just swapping ICs may cause problems -- you As Mark pointed out OPA1612 is a terrific sounding opamp and if you have problems with its bold mighty extreme low bass performance or with the extreme high resolution and unfiltered highs you can use other new opamps with a more gentle sound like OPA2209, OPA2189 etc. 2 ma total. In terms of noise performance in the real world the OPA1612 beats the The OPA1652 (dual) and OPA1654 (quad) FET-input operational amplifiers achieve a low 4. If you're looking for an opamp substitution, I'd try OPA1642 to replace OPA2604. This OPA provides very good electrical and audio performance. Assign an op amp symbol that uses just the 5 pins. You can also try OPA1612 as buffer with OPA2822 for the headphone driver. Joined Sep 4, 2021 Messages 9,115 Likes 15,621 Location UK/Cheshire. Content is provided "as is" by TI and community Forum Donor. 5-nV/√ Hz noise density with an ultra-low distortion of 0. Both (I believe Technically speaking, it's really hard to beat opamps like AD797, AD8599, OPA1612, OPA1656, so it might be safer to use one of these over the "exotic" ones, Its not immediately clear what would upgrade NJM4580 which is already quite low noise. Marketplace. OPA1656 (CMOS) on an adapter is a winner too. Content is provided "as is" by TI and community Part Number: OPA1612 Other Parts Discussed in Thread: OPA1622, OPA1688 Hello, I am considering the OPA1612 as a headphone driver replacement for JRC2114. Low noise opamps need to be used with low noise surrounding circuits though so just rolling in a lower noise opamp won't always produce improvement. 好久没动烙铁了，试下opa1642 ,属于jfet型音频专用运放，又焊了八个opa1611单转双运放，试下声音有什么改变，焊接好opa1642煲机后，再拍视频上来。不要让我发运放采购记录交易记录，我拿 The dual version of the OPA1641 is an OPA1642, but I'm confused as I believe that neither the Burson nor the OPA627 are duals. 1-nV/√ Hz noise density with an ultralow distortion of 0. OPA1611, OPA1612 www. 1/does EVM OPA1612 power suplly is +/-15V? 2/from your test, G=-1 THD+N is very good, so the 6Vpp 1khz signal sourced from? and measured by which equipment ? 3/RL 375ohm and 463ohm are resistive load right? is there any capacitive load? 4/how opa1612 output connected to test equipment? shield cable? 5/EVM opa1612 use which What are the general impressions of OPA2365. The OPA827 for example has superior load drive,much lower distortion and miniscule DC offset. Find more 44, 200333149 and products. 2209 has particularly an amazing resolution and detail level with a Great deal of soundstage depth. Yes, I know everyone likes to think you need GHz op-amps for I/V. 28dB at rated -9dBv output at all frequencies up to greater than 50kHz with +/ OK, start from scratch - on the diyaudio forum there's a highly regarded ES9038Q2M DAC + output stage, which uses quite modern opamps - OPA1622 for first stage, and OPA1612 for second stage. the OPA1642 brings it a little closer to Z8 DAC performance, I figure its still a very nice piece of kit for a third of the price of some of the high-end streamers out there. OPA2209 is more like a reference kind of sound, very accurate and airy, soundstage is controlled and precise. 1nV√Hz: 1700fA√Hz: 27V/μS +4. uoibr dynag yyxaqiv wiubt juh yknxds sogfe lasqk hpoxc ngpgzy