Opa1612 diyaudio review forum. Oct 12, 2020 · I am member of diyaudio. 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. But, for me, I simply don’t care for monolithic OPAs. Aug 22, 2009 · I just noticed today on the TI web site that the OPA1611 (single) and OPA1612 are finally reality. It has the most stable input capacitance vs. Cheers, Greg ••• 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). 8 bucks for a genuine part. 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. Reactions: Phorize , August and Evgeniy Jul 5, 2006 · IIUC the folks at Sparkos designed the board for Allo or they collaborated on it. At this point noise and ultra low noise supplies might be the last area I should put more effort into for this interface. 0006%, closely followed by OPA1612 (though a bit unstable) with 0. 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. Pretty much a stock board with the stock NE5532 op amps, however I did install some slightly nicer DIP 8 sockets. Jan 26, 2022 · The amp remains totally silent even with its volume at maximum. 9018 request one reference clock and use internal PLL. 3 V power supplies. and some other Class d and Class H 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. Even personally me did a lot of changes (change all the L to separated regulators, change the output to I/V stage (47920), add Salas Power supply to analog add a special OPA based regulator to AVCC (own design) change OPA to 47920 May 23, 2018 · Opa1656 and opa1612 without tweaking have better performance than almost any discrete solution. 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. Jan 30, 2019 · So after some consideration I ordered the DX3 Pro at 12. Only unmoderated members can post here. It turned out that these OPA1612 are cheap TL082 FET Opamps as you can see on the photos. Nov 21, 2019 · Not great current noise alas, probably unsuitable for MM phono amps as a result, but look decent performers otherwise. Apr 8, 2021 · Hi amigos, I share with a quick review of an unknown new DAC. I opened one SO-8 package and put it under the microscope in our workshop. Something like that. 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). - Choice is not permanent and can be changed by the customer via internal jumpers at anytime. The OPA2210 is a jewel ! I tested the OPA1622, OPA1612, OPA1656, OPA1692 The OPA2210 definitely worth trying as I said before ! (I sent a pair to another forum member to get his opinion as well) In any case, do not embark on this adventure without having good welding skills. 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 . 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). 0007-8%, then OPA1652 with 0. com. I initially saw both the low input impedance and the signal inversion as potential drawbacks. So i expected to get fakes but i wanted to know it for shure. LME49720 sound is boringand too light. Jan 6, 2020 · So, you try different devices and measure. Tangent didn't mention AD826 and LT1364, which are my best choices. Aug 3, 2019 · I have successfully assembled and tested them with OPA1642s and OPA1612s. 5 metre cable at 33. Oct 20, 2020 · 7) DIYINHK ESS ES9016 DAC - $30 shipped - SOLD Bare DAC board with no power supplies based on the ES9016 chip. I noticed a low-cost headphone amplifier board based on Jul 4, 2021 · The article linked below isn't the be-all and end-all on op amps tests, but very informative. . Gain stage combined with LPF 50-80kHz, OPA1612 probably composite but not necessary yet. 7 V ADC input 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 · Now i tested opa1612 with lme49720 and 1612 is better in my opinion. 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 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. Jan 7, 2020 · There are many reviews of audio hardware and expert members to Forum Donor. Joined Dec 9, 2019 TI’s OPA1612 is a SoundPlus™ Audio Operational Amplifier Jun 30, 2021 · I would like to thank Carlos from Burson Audio for making this review possible. I read on several forum the advantage to use specific AOP for the final stage of DAC or Amplifier. Mar 17, 2019 · The OPA1641 would be slightly better. While improving on the flaws, some of the IC's SMD legs gave up and broke off. I must test muses now. Even though Amir his measurements on ASR showed that an LPS wouldn't improve sound too much compared to the original 1. TL074 is easily surpassed by OPA1644, that's a no-brainer. i expected them to put some 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. This is why they cannot be updated on this module in differential mode only. Dec 11, 2019 · It's a killer OpAmp, and better suited to non-inverting buffer duties than the OPA1612/2211. I also own some Hypex NCore NC502 / NC 500 and NC250 MP and a brand new Merus double Mono amplifier. And ADA4627, which appears intended as a direct replacement (a decompensated ADA4637 exists as well). SQ was about the same as other ESS-based dacs in that class. We do not vet any members. 0000x distortion and so on). Use of this facility is at your own risk. I payed 6. common mode voltage that I've measured on any op amp. Several reference are used on forum. It could be very interesting to test their performance: - SNR - Bandwish - slew rate-. I suggest the following reference - 994Enh Discret OpAmp SONIC IMAGERY LABS - SPARKOS LABS SS3606 - AOP 1612 - LM4562 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. 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 May 3, 2022 · Its not immediately clear what would upgrade NJM4580 which is already quite low noise. 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. LME in other hand, has common collector, so it is better for loads like DAC AVCC, I believe. Dual customzied solution will give unmeasurable distortion (possibly -180db). I own almost all the TPA325X, see my reviews on Forum. He does test the TL072 against some more modern ones, but not the OPA1612 due to there being no DIP version I think. The 4 x OPA1612 in it right now sound ok. It turned out that in my internally developed Wien bridge oscillator, with the lowest THD-N, LF4562/LME49720 showed 0. Apr 17, 2021 · D90 III used two ES9039SPRO which is more than D90SE with one ES9038 and AVDD5V provided from OPA1612 DAC 1. It's quite different from previously ESS chip since 9018. alongside with some aliexpress el`cheapos for like 2 buck a piece instead of 7. 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. Use a simple resistor, or a J-fet with the IDSS trimmed to 3mA~5mA. 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. I have a AK4396 DAC (china made) which use a singe dual opamp at output stage. 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. One S300iu integrated amplifier | Stereophile. I have a Technics MASH cd player with the SMDs type of opamps needed. 12 for 1085 RMB (€140) and inmediately ordered a 15V/1. 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. 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. (requires good soldering skills, check user guide) Jul 25, 2016 · Hello all My Marantz and most of my CD players have the LM4562 which I find is great. 5A LPS with it for 360 RMB (€45). Get answers and advice for everyone wanting to learn the art of audio. He gives strong recommendations for some applications and also caveats about ill-informed op amp rolling. It comes with an NE5532. It is using the same chips as the Soncoz SGD1 ) At first sight, the DAC is really really Mar 27, 2023 · - Buckeye buffer stage (OPA1612 OP Amp), allowing for Low/Med/High gain settings via toggle switch on the rear. I don't care about listening tests or something else, just want to use the technical better one in my amp. 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. OPA1656 sounded worst, Muses 8920 sounded best. Mar 17, 2019 · We tried OPA1612, OPA1656, NE5532, and Muses 8920 opamps in Rohm BD34301EKV Evaluation Board (which came with 5532's installed). I got free shipping with Element14 till 29th of this month 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. The 1642 does not as the offset is too high. It enabled the use of better components (actual measured performance) that otherwise Feb 11, 2021 · looks very similar to the eighth image from post #2 of Bel Canto's S300i/S300iu - driven by dual mono Icepower amplifier modules with switch mode power supply - go to Inside the Bel Canto S300i integrated amplifier | Audiokarma Home Audio Stereo Discussion Forums and Bel Canto e. 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. It has a strong output stage as well as JFET inputs. com In no case did I have too high expectations regarding the sound 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. Custom Input Buffer Board w/: 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. 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 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 Jul 26, 2020 · On Head-Fi forum they say OPA2209 is better than 1612 & Burson. diyAudio provides this forum for the convenience of our members, but makes no warranty nor assumes any responsibility. It could sound pretty good, but one could get sound just as good from IC opamp designs. This needs +/- 12 V and two 3. Of course, I do not go to use "special" $4 LDO from ESS when I can take opa1612 and get less noise. 5 MHz LM4562, 55 MHz OPA2134, 8 MHz A 1 metre cable with polyethylene dielectric has its first resonance at 50 MHz, a 1. This configuration is best for use in setups with a source/DAC capable of higher pre-out voltages. May 19, 2017 · maybe modern production 3886 are all above average? the designs seem to take the 'typical' GBW spec as the effective minimum My guesstimate puts the safe with production variation margin local closed loop gain corner as low as 100kHz for LM3886 with a greater than 4:1 range designing for stable extra loop gain from the nice input op amp really doesn't give much 20 kHz added safe composite loop 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. Mar 17, 2019 · I wasn't complaining about the OPA1611 , just as an example of bipolar NPN input opamps , like the OPA1622 , or AD797, NE5532, OPA1692, Anyone know whether the LM4562-LME49710-LME49860 series are PNP input or NPN . It has OPA2604 buffer amps that many have replaced with dual OPA627BP's with good results. Jan 26, 2024 · The Vendor's Bazaar forum is for commercial offers and transactions. 0009-10% but with a much more stable response Mar 1, 2016 · besides I would mention that, on diyaudio there is a quite intensive thread in the topic of modding of this board. Generating higher levels of H2 would be fun. My workshop is for fun and not to produce a product. 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. Sound is more "color", and "massive". 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. TI/Burr Brown's OPA2604 is a good alternative as well. Low- and Mid-Frequency Test Signals for Evaluation of Room Modes // Measurements: ESS Hump revisited // Humpify -- apply "ESS hump"-style distortions to audio files. Please refer to post #4603 The diyAudio First Watt M2x for my evaluation of the first set of opamps. Mar 17, 2019 · For audio use, I see no reason to buy OPA627 when you have OPA827, OPA828, OPA164x, and OPA1656. Dec 9, 2019 · Home: RME ADI-2 Pro FS R BE—Neumann KH80 DSP, Arendal Sound 1723 1S Work from Home: JDS Labs Atom—Etymotic ER4SR, AKG K371, Sennheiser HD820 Measurement: Earthworks M30 (Reed R8090)—Earthworks ZDT 1021 — RME ADI-2 Pro FS R BE — REW Jul 5, 2006 · Thanks for the link. Oct 8, 2001 · My choice would be OPA1612 oder ADA4898-2. Jan 6, 2010 · I have an Onix XCD-99 which is basically a Music Hall CD-25. 0A switching brick. OPA1612 on paper has lower voltage noise but whether its lower noise in practice depends on the circuit impedances. But that does not say anything about the SQ. 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. 7 EUR at Mouser. Standard opamp for that has pretty much become OPA1612. I had read it many times before posting this threat. On the other hand, you can add the OP amps of your choice in SE mode. (Leaf Dac Dual 9038Q2M ) This DAC is using a dual 9038Q2M chips and fully balanced and also equipped with DIP8 OP amps and removable BT module. Apr 14, 2021 · Indeed, the entire OPA1612/42/52/62 series has proven to be great low THD solutions. (AIYIMA, DrMordor V1 + V2, Zero Zone, 3E Audio, Generic TPA3255; BRZhifi etc). They are ~6. I've tried replacing it with a number of opamp (OPA2314,LT1057,LT1364,OP275,OPA2604,LME49860). 3 MHz. Jan 5, 2020 · the schematic is pretty much the same as shown above, only for a single chip, and FDA input, + switchable input resistors. Jan 14, 2019 · I bought 10 OPA1612 from a chinese ebay seller. Dec 31, 2018 · Featured Vendors The diyAudio Store Parts Connexion miniDSP DIY RME ADI-2 FS Version 2 DAC and Headphone Amp Review | Audio Science Review (ASR) Forum Jun 8, 2023 · Some members in the Pass Labs forum section used my design in their First Watt clones with the same conclusion. OPA1692 seems better than OPA2209 Little review Sometimes I change from OPA2209 to OPA1612 to May 8, 2011 · Speed is an issue, though. Maybe it's too soon for anyone to have obtained and evaluated samples, but -- well -- has anyone yet? Feb 11, 2021 · According to the TI datasheets OPA1612 has less noise than OPA1656. That post includes system and program material information and a Apr 15, 2023 · A cheap Chinese DAC that cost less than $200. 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. TAITIEN 22M/25M in the center can be switched to DAC. 2V came from the D2D IC on the left lower side. Nov 9, 2012 · Total Agree. He’s optimized the distortion for the OPA1612 into the TPA6120A2 for lowest distortion and that’s not what I’m about. 6) Output XLR balanced, ideally if with a big-good permalloy trafo. May 22, 2021 · There are many reviews of audio hardware and I know that you are also active in the thread on DIYAudio where I just posted OPA1612, 2 V, 1. 80 EUR for all ten. 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. IMHO the outcome was mostly decided by how the opamps responded to the RF coming out of the dac chip. ••• 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). For the case of May 2, 2020 · 3E Audio used the OPA1612 on their module after a series of tests it turned out that they gave better results than the other OP amps tested. 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. But both OPA1612 and OPA2134 has a common emitter output stage. The diyAudio Community. I've dropped the 1612 into a preamp and it passes music. Nov 17, 2017 · I'm trying OPA2134, witch output stage is the same as OPA1612, and I'm not satisfied at all. 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. With a low price and nevertheless minimum THD. The 4 x fake OPA1612 in another identical one sound even better, surprsingly good in fact, but they required that I make tiny heat sinks for them because they run so hot. May be OPA1612 is OK, I don't know. I've seen mention of these on various threads in this and other forums. 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. 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. I love details clarity, soundstage - listen to rock classical and vocals. lmkzzmuox wnybus slyao gfm dlll ezdaoa lsdws fntp svof vvdxddrs