Opa1612 diyaudio review reddit

Opa1612 diyaudio review reddit. I'd suggest using NE5532 or OPA1612 for U4 in the first instance and see if that's making a difference. 9038 recomendation is OPA1612, OPA1656 Mar 17, 2019 · We tried OPA1612, OPA1656, NE5532, and Muses 8920 opamps in Rohm BD34301EKV Evaluation Board (which came with 5532's installed). For a lot of these op amps, the parameters which fall out of spec may not make a hill of beans difference in an audio circuit, but make them useless for instrumentation. 5A LPS with it for 360 RMB (€45). Even though Amir his measurements on ASR showed that an LPS wouldn't improve sound too much compared to the original 1. I have diyinhk es9038pro board and try muses8920 for i/v and LPF. No hump at all and IMD of two devices together looks quite low, at least 3 times better vs DIY 9038PRO(which is 12x times more expensive vs 9038Q2M) I have to remeasure DR/SNR and THD+N as well, because OPA1656 is Aug 30, 2020 · The OPA1612 has worse current noise rating compared to for example the good old NE5542. May 8, 2011 · Speed is an issue, though. Opa1656 has good phase response at high frequency. This combination will sound slightly more clinical than the OPA2228/OPA2822 combination. Apr 7, 2019 · Unpopular opinion- If you are talking about measured performance in the audio band, it probably is OPA1612 or LME49720. Aug 3, 2019 · I have successfully assembled and tested them with OPA1642s and OPA1612s. Sound is very good, especialy a voice but sometimes I hear a little distortions. Oct 25, 2023 · Been tracing out this new es9039q2m DAC to give it cleaner supply to the relevant parts. 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. Dec 10, 2015 · A fair question! And although I was the product definer and systems lead for this part, I don't get 100% control over the marketing folks But, I can honestly say that when we started working on this part about a year ago, I was very adamant that I didn't want to create a part with excellent specs but terrible sound quality in the real world. Facebook Reddit Pinterest Community platform by XenForo Jan 5, 2020 · How many layers does your board have? I design a ES9038Q2M board with ADP151 for AVCC and Opa1612 buffer for AVCC_L, AVCC_R on 2 layer pcb, one layer is solid gnd plane and only get one channel 2nd harmonic at about -110db, 3rd -120db, another channel is -120db, -108db respectively, opamps for IV and SE converter are also opa1612, do you have any suggestions? Oct 9, 2019 · For the RIAA I use OPA1612 instead of the LM833. Apr 26, 2018 · Mark Johnson Opamp Evaluation Round 2 Mark Johnson kindly sent me a second set of evaluation opamps which I was very happy to listen to and review immediately upon receipt. Looking at it its clear that your DAC chip has internal opamps (its voltage-out), these are most likely to be the weakest link in the chain such that they'll limit the improvement you get from upgrading downstream chips. Yes, it's a very subjective question, so what I am looking is the highest class of sound -- In my opinion, also as said by Tangent, the openness and the cleaness of OPA627/37 put them into a higher league that OPA2604 and LT1364, both of which are very • audio·phile: a person with love for, affinity towards or obsession with high-quality playback of sound and music. TL074 is easily surpassed by OPA1644, that's a no-brainer. At this point noise and ultra low noise supplies might be the last area I should put more effort into for this interface. 7 EUR at Mouser. In your simulations you seem to use a purely resistive load (32 ohm). The op-amps are not necessarily bad just because the part number start with NJM. The OPA1612 is used by Topping/SMSL and I believe Gustard is using it too and also in the Latest Topping Preamp that everyone is gossiping about…. common mode voltage that I've measured on any op amp. Jul 24, 2017 · OPA1612 has like an 80 MHz GBW and 40 MHz fT while being run at a gain of 3, while NJM4556AD is an 8 MHz part. A couple of things surprised me a bit. Jan 6, 2010 · Replace OPA2604 with OPA1612? Jun 17, 2015 · I tried my Whammy (with OPA1612) and found it smoother but sacrificed a small amount of detail, so I still prefer the BA2018. mainly because although the 1611/12 series are technically very sound, I find them boring as hell. MFB, and Sallen-Key configuration Jul 4, 2021 · Sounds like you need some sort of EQ system to get the effect you want, opamps just all work the same, some are a bit noisier, some have higher distortion, but they don't do florid adjectives, just reproduce a signal to a high accuracy (if all is working well). Just check the rails aren't over +/-18V. Generating higher levels of H2 would be fun. Also they are very hot. BTW, last year I crippled my €4. Cheers, Greg ••• Jan 30, 2019 · So after some consideration I ordered the DX3 Pro at 12. Dec 8, 2023 · Welcome to SylphAudio thread! Our New Product Release Roadmap for 2024 **** SE800 PFFB High Power Class-D Amplifier Supply Voltage: dual ± 25V min, ± 85V DC max Unclipped Power ( Feb 22, 2019 · My experience with the Burson V6 "Vivid" opamps Feb 11, 2021 · According to the TI datasheets OPA1612 has less noise than OPA1656. Feb 17, 2023 · Hello, guys. 15ppm, intermodulation way below that, 1. But in general once you give these opamps +-15V then they can output about +-14. In addition, another possible consideration is with the opamp VCC- connected to ground, then the opamps are running with inputs and outputs offset to within 3 May 19, 2017 · Something better than the LM4562? Jun 5, 2023 · 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. Something like that. Mar 5, 2018 · System: Equitech 1. Mar 14, 2010 · OPA1612 is fuller sounding - especially lower midrange but also more dynamic. Benefit is lower dc offset and less distortion also high open loop gain also superior stability. Jul 25, 2016 · The schematic is very helpful thanks. TI was going to discontinue the LM4562 and others as well. What's not to like with that, and all the other SoundPlus family? Craig ••• Jul 26, 2020 · OPA1692 seems better than OPA2209 Little review here : The Opamp thread | Page 392 | Headphone Reviews and Discussion - Head-Fi. The high bias currents responsible for the high current noise will cause issues in many circuits with offsets too - pretty much every stage needs ac-coupling with that sort of bias. He’s optimized the distortion for the OPA1612 into the TPA6120A2 for lowest distortion and that’s not what I’m about. Mar 22, 2022 · The OPA1612 is one of the best I’ve ever encountered, the LME 49720 are hard to beat at any price……. Use a simple resistor, or a J-fet with the IDSS trimmed to 3mA~5mA. It is a little bit cleaner and perhaps because of that instruments are more defined in space. They are ~6. Last edited: 2021-03-30 4:29 am Sep 14, 2021 · 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). Jun 30, 2021 · I would like to thank Carlos from Burson Audio for making this review possible. Output pin 4 is about -1. i expected them to put some Mar 17, 2019 · The OPA1641 would be slightly better. Now even 40 MHz / 3 clearly is not < 3 * 8 MHz, so that won't work out without some local feedback across the 1612 to reduce GBW, usually in the form of a small capacitor. I had read it many times before posting this threat. Jul 30, 2021 · If I could also request test of: OPA1642 ~ 2 Euro OPA1656 ~ 2. Feb 11, 2021 · 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. Haven't seen this Oct 29, 2009 · That is why I always say 'when used correctly'. When we developed the OPA1656, this was also a major design target for us, and the designer and myself spent quite awhile in the lab with previous CMOS audio op amps (specifically OPA1652 and OPA1688) hunting for sources of input capacitance variation. I had been thinking about trying out some of the Burson opamps and saw on these pages that Burson would send opamp samples for an honest review and good to his word Carlos sent me 2 V5i-d opamps to try and review. I opened one SO-8 package and put it under the microscope in our workshop. Input pins 1, 2 are ok (5vdc and 0v). Harmonic distortion <0. Apr 8, 2021 · LEAF Dual 9038Q2M VS Gustard X16 pictures inside Mar 17, 2019 · We tried OPA1612, OPA1656, NE5532, and Muses 8920 opamps in Rohm BD34301EKV Evaluation Board (which came with 5532's installed). Dec 11, 2019 · It's a killer OpAmp, and better suited to non-inverting buffer duties than the OPA1612/2211. CMRR is not a big issue. Jun 25, 2021 · SMPS powered small cl. With a low price and nevertheless minimum THD. Nov 2, 2010 · Try a pull-down load to the negative supply rail to force the NE5532 into class A, just a few mA will really make it sound better. May 19, 2004 · agreed, but I just couldnt help myself in this instance. Mar 17, 2019 · The OPA1641 would be slightly better. Dec 25, 2019 · The OPA1612 may be strained close to its limit, but the LME479xx family exists even in a variant that can output 100mA. 8 bucks for a genuine part. Nov 2, 2018 · Many of us experimenting with many different power amplifiers run into the problem of needing a pre-amp for test that can handle all power amplifiers concerning input level and impedance. I like the OPA1642 due to its MUCH reduced bandwidth compared to the 1656 (11MHz vs, 55 Jun 5, 2023 · I have used the OPA1612, AD797, LT1115, OPA1642 and OPA1656 in phono/analog preamp stages for a while now and have conducted extensive listening tests, sometimes double blind, sometimes blind, sometimes as just an unannounced "impartial" observer to listening/comparison/"shoot out" sessions. May 23, 2018 · Opa1656 and opa1612 without tweaking have better performance than almost any discrete solution. 4vdc, pin 6 is about 5vdc only. 1/f corners: 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 May 19, 2004 · If you're looking for an opamp substitution, I'd try OPA1642 to replace OPA2604. I do reverse the loudspeaker leads when listening to the B1K to maintain signal chain polarity. I went through several iterations and settled on JFET buffers to raise the input impedance. The two 1612s that I have tested have offsets <150uv and the DC servo loop functions in the MC preamp. IMHO the outcome was mostly decided by how the opamps responded to the RF coming out of the dac chip. 12 for 1085 RMB (€140) and inmediately ordered a 15V/1. My workshop is for fun and not to produce a product. Jan 26, 2012 · zergxia I think you'll never see H2 with 1656 <-140-145db if you'll not match the opamps inputs impedance. It turned out that these OPA1612 are cheap TL082 FET Opamps as you can see on the photos. Power it off, and check ohm values from pin 1 to 4, 5, 6 are infinitive. It has a strong output stage as well as JFET inputs. Tangent didn't mention AD826 and LT1364, which are my best choices. Apr 16, 2021 · I wonder if the OPA1612 are like this: Fake OPA1612 from China I have done similar small test batches and examination of some other components such as solid polymer capacitors, polypropylene capacitors and certain difficult to obtain very low noise transistors. Feb 11, 2021 · 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. I'm not sure on the output current. Sound is more "color", and "massive". ADA4625-1/2 are supposed to be even better than the ADA4627-1, though I've yet to try them. Mar 17, 2019 · TI's SoundPlus opamp family are astonishingly superb designs. 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. May 19, 2017 · OPA2211A/OPA1612 also sound a bit better than LM4562, IMO. Jul 5, 2006 · Hi All, Please advise what would be the best bet for a modern replacement of the NJM353 in my 12-15 years old vintage 4X60W Class A Zero Feedback car amplifier? Tried dual OPA627AU on adaptor but the sound is of reduced volume, of loss details and PCB is warmer than before and the noob in me did not realized the input current of 7mA X 2 or 14mA for the each of 4 dual adaptor as compared to Jun 8, 2023 · THD=-117. OPA1656 sounded worst, Muses 8920 sounded best. 000 (DIY!) tube preamp with tube Jan 11, 2019 · Improving a cheap chinese PCM1794 DAC Jul 5, 2006 · Since CMOS parts tend to top out at a mere 5. 3 MHz. Low output current would mean the transimpedance gain of the I/V circuit will be high, and the input current noise of the op amp will be a significant contributor. Often chosen for headphone amplifiers (built one and loved it) it could also be used with speakers when using a OPA454 as controlling opamp for increased voltage swing. With the current buffer output stage it should simplify design very much. Jan 5, 2020 · the schematic is pretty much the same as shown above, only for a single chip, and FDA input, + switchable input resistors. Also they are not necessarily "one size fits all" just because the part numbers start with OPA. Aug 15, 2014 · Wel I have tryed th model OPA1612 and it works in the 64 bit version, but not in 32 bit version, I get just offset and no amplifing effect. Mar 17, 2019 · And I would bet that the amplitude of each step is too small to actually reach the slew rate of the amplifier. A amp I very much like this example of a composite. OPAs 1642 and 1656 MUCH MUCH better. I'd like to have a crack at making a decent DAC to level up my elec skills. Mar 17, 2019 · Voltage noise is higher on 1656 at low frequency til 1khz. Dec 31, 2018 · RME ADI-2 FS Version 2 DAC and Headphone Amp Review | Audio Science Review (ASR) Forum opa1612 , opa1622, muses8920 or LM4562? Facebook Twitter Reddit May 8, 2022 · I am not certain that would be an good idea: The MJM4558 should have a gain-bandwidth of 3MHz whereas the OPA1612 has 40-80 MHz (depending on amplification). He gives strong recommendations for some applications and also caveats about ill-informed op amp rolling. 5 V - single supply - I would not be surprised to find some common-mode issues. Jan 19, 2023 · - 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 very fast opamp but therefore it is easy to get it stable Jul 5, 2006 · IIUC the folks at Sparkos designed the board for Allo or they collaborated on it. Transients are stronger, both rimshots of snare drum and big-band trumpets. SQ was about the same as other ESS-based dacs in that class. I've done more research and actually have decided against the 2211 and will be using the opa1612 instead for the following reasons: - opa1612 supports 45ma full output current (which could be useful since it's an output buffer stage driving unknown amplifier impedance Nov 17, 2017 · Probably better to use OPA1612 anyway, less sensitive to RF and may sound a little better too. If you're prototyping - be sure to apply power at the same time, if your ground connection fails - AD8397 will burn, JRC4556 is virtually indestructible compared to AD8397. At a gain of 60dB, the THAT is only down to -82dB. 8Vrms and remeasured the range -15dbfs. 6) Output XLR balanced, ideally if with a big-good permalloy trafo. Low- and Mid-Frequency Test Signals for Evaluation of Room Modes // Measurements: ESS Hump revisited // Humpify -- apply "ESS hump"-style distortions to audio files. TI/Burr Brown's OPA2604 is a good alternative as well. More options Share Jun 23, 2019 · 5) I/U OPA1612 or similar with 600ohm feedback resistor and some preliminary passive LPF before I/U stage(ES9038Q2M has quite big out-band noise). I'm using the OPA1612 dual opamp in a commercial design. Apr 7, 2019 · Rs can be also in series with both RC which is a tiny bit better. 1-nV/√ Hz noise density with an ultralow distortion of 0. LME49720 sound is boringand too light. 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. Jul 5, 2006 · Personally I prefer LM4562, OPA2228 and OPA1612 over OPA1642 because of the input noise that makes it sound less pristine. You should go with opa1612 all the way, in both i/v and filters once you're upsampling . Nov 21, 2019 · Not great current noise alas, probably unsuitable for MM phono amps as a result, but look decent performers otherwise. It's best use as an alternative to opa1612 when noise is not a big concern. Jan 14, 2019 · I bought 10 OPA1612 from a chinese ebay seller. Sep 14, 2022 · 800d model Power amplifier based on Hypex modules Power supply: 2 Hypex SMPS400 V14 modules Final modules: 2 Hypex UcD400OEM V7 Rated power: 250W 8 Ω 1% THD, 400W 4 Ω 1% THD This is a completely dual mono final, each channel has its own Hypex SMPS400 power supply (V14) in the version with ± 62V DC output voltage that powers a Hypex UcD400OEM (V7). g. 1nV/root Hz at 1kHz with a 10Hz 1/f corner and will cheerfully drive 600 ohms. 8 or 2. Thanks for the information on "running hotter". . The real limitation is a somewhat limited drive ability, but we also have to be realistic and say that even though 2k loading is often suggested as a minimum value, that figure is one that allows full voltage swing when operating on nominal -/+15 volt supplies. Pin can be left floating or connected to any voltage between (V–) and (V+). But, for me, I simply don’t care for monolithic OPAs. For the case of Jan 6, 2020 · Not long after AX published Michael Steffes composite OPA1612/TPA6120A2 design in March, 2021, I decided to give his circuit a try. I also tried my B1K and find I also prefer the BA2018. OPA1612 on paper has lower voltage noise but whether its lower noise in practice depends on the circuit impedances. Standard opamp for that has pretty much become OPA1612. Yes, I know everyone likes to think you need GHz op-amps for I/V. It could sound pretty good, but one could get sound just as good from IC opamp designs. Oct 29, 2009 · Even for audio use there are a lot of different applications like - line stage low gain/unity gain (buffer) - line stage, high gain (microphone amplifier) - RIAA stages with RIAA in the NFB network - power amp front end (two versions - signal pad by output and by power supply rails) - two version of low pass/high pass stages in active crossover networks (e. That circuit will work very well with any dac that outputs 1ma . ti. Of course, I do not go to use "special" $4 LDO from ESS when I can take opa1612 and get less noise. Unfornately the 64 bit version crashes all the time after some time of simulation, I can not use it, and that was also the case past year, so I did replace the 32 bit version again and that works oke, reason I do not now, maybe mailing the writer of the Dec 10, 2018 · Mark, thank you for reply good to know that you like OPA1612 as I/V for quality 24 bit dacs do you recomend to try It with not just only pcm1794 but also pcm63, pcm1704 what Is your choice for power supply to pcm1794, analogue and digital : Salas shunt, LT3042, ADM7150, cap multiplier what Is your choice for OPA used as diferential summator / low pass buffer - what do you think about OPA2132 Nov 13, 2016 · Aren't you comparing the the that1512 at 60dB gain vs the opa1612 at 0dB gain ? At x1, the that1512 is -100dB thd+n (0,001%). Jan 5, 2020 · I did replace OPA1612 for OPA1656, and also switched ADC input range for the 1. Pin 2-4 are 130ohm, 2-5: 0ohm, pin 2-6: 4300ohm. org OPA1656 is a great alternative to OPA1692 as well. 000015% at 1 kHz. Even AD797 or OP627 cant hold a candle vs OPA1612 in terms of SQ - the difference is HUGE! My preamp sounds best with OPA1612 for gain and OPA2192 as buffer. I realize power supply for the JC MC front end is absolute critical and quite touchy as DC voltage must be kept absolutely stable and noise free as well. While improving on the flaws, some of the IC's SMD legs gave up and broke off. Gain stage combined with LPF 50-80kHz, OPA1612 probably composite but not necessary yet. 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. Wouldn't it be necessary to check the stability with a complex load, at least with a capaci Apr 18, 2020 · It has something for it (buffer, filter) but for I/V I liked the opa1612 a lot for an I/V task looking forward your review about this new one over the 1656a very good one for ears indeed. Remember, to actually hit the specified slew rate of an op amp, you have to create a large enough voltage between the op amp inputs to direct 100% of the tail current into the compensation capacitor. The plan is to build the amplifier stage directly as described by TI in their reference design tidu672c Voltage conversion for the PCM2707 and PCM1794 will be done by two LP5907 Jan 26, 2024 · Audio amplifier device review: Fosi Audio ZA3 This is the second review I have written relating to a product from the FOSI brand, the first was relating to Jul 4, 2021 · The article linked below isn't the be-all and end-all on op amps tests, but very informative. Swapping might (not "will") cause oscillation as the PCB and decoupling designed for the slow '4558 may not be up to the task with the much faster '1612. May 26, 2016 · AD8397 is great, just be sure to put 2-3 Ohm output resitor, wirewound 5W should keep the op-amp safe from shorting output to the ground. May 15, 2022 · Member. So i expected to get fakes but i wanted to know it for shure. OPA1611, OPA1612 www. Mar 9, 2023 · 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 May 9, 2023 · Which of the two mentioned OP Amps (OPA1612 or OPA1656) is the better one, in a scientific point of view. Adding those capacitors at the input like in Denon 1560 (you need to find the perfect values yourself) can be done with any op-amp. I must test muses now. Sep 14, 2021 · The LM4562 is an exception, but otherwise it are the fast op-amps that JRA has trouble with: Misbehaving: OPA1656, gain-bandwidth product 53 MHz LME49990, 110 MHz OPA1612, 40 MHz Behaving well: OPA2604, 20 MHz OPA627, 16 MHz OPA2107, 4. That post includes system and program material information and a Dec 12, 2019 · It would most likely be +/-15V (30V total). IMO, the ADA4627-1 has a fuller, more "musical", sound than the somewhat thin/sterile LM4562, whilst still retaining nicely detailed highs, and remains my favorite sounding op amp to date. Apr 15, 2023 · MUSES02 pricing? Oct 7, 2020 · Hi :) I've a bit of experience with Altium Designer, C/PP, general MCU stuff, things like I2C and so on. 000130% Although the price was also cheap, It is a pity that NS was absorbed by TI and was abolished after losing the brand power competition with BB. 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. -60dbfs. Nov 9, 2012 · Has anyone ever had experience with MUSE opamps? Aug 24, 2012 · i tryed lme49722 opa2134 and opa1612 ,--. OPA1612 sounds better than any transistor preamp I've ever heard and better then my own 6N6P 2 case -no barrels hold- 36kg monster preamp with a 100% double blind test win rate. Now i tested opa1612 with lme49720 and 1612 is better in my opinion. 5RQ Balanced Power - Tascam CD200 - Oppo 93 - Auvio HD Radio Tuner- MiniDSP OpenDRC-DI DSP, 2x4HD - AcourateDRC - UMIK-1 - ECM8000 - REW - Behringer DEQ2496 - Behringer UMC202HD and Focusrite 4Pre USB - Benchmark DAC2 HGC - Krell KCT pre and FPB 350mcx monoblocks - Sennheiser HD650 - MartinLogan reQuest 15" x 48" electrostatic hybrid with 12" sealed woofer 180Hz cross Feb 11, 2021 · Dont make me laugh, if you can't hear the difference 5532 vs OPA1612 than you should not be very concerned about SQ (in your case). Aug 1, 2024 · The TL072 H does show a faster slew rate than before (now 20, was 13) but the same poor voltage noise and the same inability to effectively drive anything below 10KΩ. But that does not say anything about the SQ. r/audiophile is a subreddit for the pursuit of quality audio reproduction of all forms, budgets, and sizes of speakers. He does test the TL072 against some more modern ones, but not the OPA1612 due to there being no DIP version I think. I initially saw both the low input impedance and the signal inversion as potential drawbacks. I noticed a low-cost headphone amplifier board based on Jul 5, 2006 · Thanks for the link. They certainly control the output voltage. 0A switching brick. 5V continuously, and since +-10V is sufficient to drive the Purifi modules at their max output (which they cannot do continuously, mind you), I Jun 5, 2023 · Just because they are not fake doesn’t mean they’re ”good” - they may be fall outs that don’t meet spec. Aug 30, 2012 · the OPA549 datasheet has no useful audio distortion curves the related OPA541 does - and shows the worst possible distortion profile for audio - the distortion rises at low levels indicating output crossover distortion most specialized audio chip amps show low distortion at various power levels with much better profile than OPA541 LM3886, other audio chip amps have more loop gain due to The OPA1611 (single) and OPA1612 (dual) bipolar-input operational amplifiers achieve very low 1. Does this indicate that Oct 19, 2013 · DK90, I have done extensive listening test with multiple opamps in my A1 clone (including OPA1641, OPA2209, LME49720HA, OPA211, OPA2604, OPA2134, ADA4627) and had the best results with: 1. It has the most stable input capacitance vs. 707dBc=0. The 1642 does not as the offset is too high. I'm at the first hurdle, finding accurate footprints/models to Mar 17, 2019 · Hi John, Currently kind of assessing the OPA1656 following your excellent thread(s) - very modestly in some line output stages of my HIFI. I don't care about listening tests or something else, just want to use the technical better one in my amp. Check there is HF decoupling on that chip first though. I've dropped the 1612 into a preamp and it passes music. What do you think will be the opa1612 distortion now that the available amount of feedback at 1khz has lost 60db ? ••• Nov 23, 2019 · Until you change the MC33078 for something with lower distortion and noise it won't make much difference what the differential amp is (AD797 and OPA1611 are pretty similar performers BTW). I will have a listen to various op amps, old favourites and newer ones, from AD, LT and yours because your triggered my curiousity and all your efforts deserve it for sure. The higher current drive of the OPA2822 would be beneficial. You can take RT6863S, a very cheap Chinese opamp(1/3 of opa1612 cost) with very high symmetry of the input stage, and in that case, you'll see <150-160db H2. I payed 6. --lme49722 lme4562 lm4562 opamp is very good sound ,higher ratings than opa2134 -but not as Jan 6, 2020 · So, you try different devices and measure. 5 metre cable at 33. May 3, 2022 · Its not immediately clear what would upgrade NJM4580 which is already quite low noise. Oct 8, 2001 · My choice would be OPA1612 oder ADA4898-2. Now I use OPA1612 for i/v and LPF, distortion is gone but sound is flat. Dual AD797 AVCC regulators might be slightly better yet, and can also be used for ES9028PRO. Please refer to post #4603 The diyAudio First Watt M2x for my evaluation of the first set of opamps. You can also try OPA1612 as buffer with OPA2822 for the headphone driver. alongside with some aliexpress el`cheapos for like 2 buck a piece instead of 7. not just because they are so clean, there is that, but so are the others I mention, but I dunno, I just find there is a difference between clean and sterile. Jan 6, 2020 · Hi Michael, I have read your interesting article in the March 2021 edition of AudioXpress. 5 V) tends to be run inverting anyway since common-mode input range would be pathetic otherwise. Real low-voltage stuff (think 1. Mar 17, 2019 · For a DAC chip with a low output current, I would suggest op amps with FET type inputs, either JFETs or CMOS. That's 36dB worse than the opa1612, not 50. I'm hoping this community could be of help. It enabled the use of better components (actual measured performance) that otherwise Dec 11, 2018 · My plan is to use a PCM2707C for USB to I2S converstion, a PCM1794A will be used as the DAC and the amplifier stage will contain a pair of OPA1612 and a OPA1622. ••• Nov 17, 2017 · I removed DAC from Pi and power it on, measure it. Feb 11, 2021 · I think the problem I'm seeing with the OPA2156, and to a lesser extent the OPA1656 is that the 1/f knee for the noise is much higher than for the OPA1612 and OPA1642. Does anybody know how the voltage ist regulated in the following configuration? I can't find where the pins 3 and 5 of the OPA1612 are going to. 5 MHz LM4562, 55 MHz OPA2134, 8 MHz A 1 metre cable with polyethylene dielectric has its first resonance at 50 MHz, a 1. 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. 80 EUR for all ten. qrfudn osgxpm ebl kwqx mxg iotgh emkpcr epz fvmvus ydzjgm