Opa1612 diyaudio review. 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. Opa1656 has good phase response at high frequency. 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. 2V came from the D2D IC on the left lower side. 90 mm × 3. 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. 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. 8 or 2. 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. Gain stage combined with LPF 50-80kHz, OPA1612 probably composite but not necessary yet. 15ppm, intermodulation way below that, 1. It enabled the use of better components (actual measured performance) that otherwise 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. I'm using the OPA1612 dual opamp in a commercial design. Apr 8, 2021 · Hi amigos, I share with a quick review of an unknown new DAC. Please refer to post #4603 The diyAudio First Watt M2x for my evaluation of the first set of opamps. It's quite different from previously ESS chip since 9018. Benefit is lower dc offset and less distortion also high open loop gain also superior stability. 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. Low- and Mid-Frequency Test Signals for Evaluation of Room Modes // Measurements: ESS Hump revisited // Humpify -- apply "ESS hump"-style distortions to audio files. 5 V) tends to be run inverting anyway since common-mode input range would be pathetic otherwise. Real low-voltage stuff (think 1. I initially saw both the low input impedance and the signal inversion as potential drawbacks. 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 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 Search Everywhere Threads This forum This thread Jul 26, 2020 · OPA1692 seems better than OPA2209 Little review here : The Opamp thread | Page 392 | Headphone Reviews and Discussion - Head-Fi. 6) Output XLR balanced, ideally if with a big-good permalloy trafo. Although, I have to think that all of our hard work achieving ultra low noise in phono preamps goes out the window as soon as the needle touches the vinyl, and circuit noise is swamped by mechanical noise in the system. TL074 is easily surpassed by OPA1644, that's a no-brainer. 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. Apr 14, 2021 · Makes me wonder I bought (Have not gottem them yet) OPA1611. • Wide Supply Range: ±2. OPA1612 on paper has lower voltage noise but whether its lower noise in practice depends on the circuit impedances. Reactions: Phorize , August and Evgeniy Jan 6, 2020 · Good morning all, I was not actually aware all this composite amp work using the TPA6120A2 was going on. Maybe it's too soon for anyone to have obtained and evaluated samples, but -- well -- has anyone yet? May 15, 2022 · Now i tested opa1612 with lme49720 and 1612 is better in my opinion. Generating higher levels of H2 would be fun. Mar 27, 2023 · - Buckeye buffer stage (OPA1612 OP Amp), allowing for Low/Med/High gain settings via toggle switch on the rear. ti. 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. 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. 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. 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. My workshop is for fun and not to produce a product. They are ~6. This configuration is best for use in setups with a source/DAC capable of higher pre-out voltages. Sound is more "color", and "massive". OPA1656 sounded worst, Muses 8920 sounded best. Resistor values were right according to this schematic. Harmonic distortion <0. Yes it destroyed many many extreme expensive commercial preamps in the last 25 years. Dec 11, 2018 · Featured Vendors The diyAudio Store Parts Connexion miniDSP DIY HiFi Supply. Nov 21, 2019 · Not great current noise alas, probably unsuitable for MM phono amps as a result, but look decent performers otherwise. For the case of Apr 17, 2021 · D90 III used two ES9039SPRO which is more than D90SE with one ES9038 and AVDD5V provided from OPA1612 DAC 1. At this point noise and ultra low noise supplies might be the last area I should put more effort into for this interface. 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 Oct 7, 2020 · Featured Vendors The diyAudio Store Parts Connexion miniDSP DIY HiFi Supply. In parallel, talking with Jan Didden, I had embarked a similar trek that now show up on page 42 of the March 2021 AudioXpress. The device is specified from –40°C to • Rail-to-Rail Output +125°C. 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. TAITIEN 22M/25M in the center can be switched to DAC. It depends on the requirements you have. But both OPA1612 and OPA2134 has a common emitter output stage. May 4, 2016 · I’ve been following the thread "New Audio Op Amp - OPA1622" for a while and at some point decided to make myself a new universal buffer/headamp based on the OPA1622. 4" plug). . Mar 1, 2016 · besides I would mention that, on diyaudio there is a quite intensive thread in the topic of modding of this board. It turned out that these OPA1612 are cheap TL082 FET Opamps as you can see on the photos. May be OPA1612 is OK, I don't know. 1nV/root Hz at 1kHz with a 10Hz 1/f corner and will cheerfully drive 600 ohms. 9018 request one reference clock and use internal PLL. Mar 17, 2019 · We tried OPA1612, OPA1656, NE5532, and Muses 8920 opamps in Rohm BD34301EKV Evaluation Board (which came with 5532's installed). Last edited: 2021-03-30 4:29 am 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 love details clarity, soundstage - listen to rock classical and vocals. Jan 30, 2019 · So, first thing I wanted to try is to upgrade the opamp in the LPF. The 4 x OPA1612 in it right now sound ok. alongside with some aliexpress el`cheapos for like 2 buck a piece instead of 7. - Choice is not permanent and can be changed by the customer via internal jumpers at anytime. 25 V to ±18 V Device Information(1) 2 Applications PART NUMBER PACKAGE BODY SIZE (NOM) • Professional Audio Equipment OPA1612-Q1 SOIC (8) 4. It has OPA2604 buffer amps that many have replaced with dual OPA627BP's with good results. Of course layout and bypass design matter along with the basic circuit as shown on the schematic, its not just the chip. 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 also tried my B1K and find I also prefer the BA2018. OPA1612, OPA2211, LME49720HA, OPA2111, AD746 (class A), AD8620, AD8066, Jul 5, 2006 · Standard opamp for that has pretty much become OPA1612. I noticed a low-cost headphone amplifier board based on Mar 17, 2019 · The OPA1641 would be slightly better. I don't care about listening tests or something else, just want to use the technical better one in my amp. Jun 25, 2021 · While looking for completely different things, I found this old magazine by chance from November 1992 Radio Electronics (November 1992) : Free Download, Borrow, and Streaming : Internet Archive and an excellent diy power amp project at hard to beat price with LM1875 and AD711 - go to the Aug 24, 2012 · i tryed lme49722 opa2134 and opa1612 ,--. --lme49722 lme4562 lm4562 opamp is very good sound ,higher ratings than opa2134 -but not as May 8, 2011 · Speed is an issue, though. Diy DAC/amp with PCM2707 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. That post includes system and program material information and a Apr 15, 2023 · A cheap Chinese DAC that cost less than $200. OPA1612 May 3, 2022 · Its not immediately clear what would upgrade NJM4580 which is already quite low noise. It is using the same chips as the Soncoz SGD1 ) At first sight, the DAC is really really Jan 14, 2019 · I bought 10 OPA1612 from a chinese ebay seller. i expected them to put some 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. 8 bucks for a genuine part. 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 25, 2016 · Hello all My Marantz and most of my CD players have the LM4562 which I find is great. Replace the OPA1612 with the rediculously pricey Sparkos SS3602 (690 RMB €80). Cheers, Greg ••• Jan 6, 2010 · I have an Onix XCD-99 which is basically a Music Hall CD-25. 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 Mar 22, 2022 · These are probably among the two highest of the best sounding dual opamps around today. 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. Jan 11, 2019 · 2. 6 mA per Channel package. org OPA1656 is a great alternative to OPA1692 as well. The idea is to use it as an output buffer for my standalone volume controller/source selector with the direct headphones drive capability. Mar 17, 2019 · But for MC phono pre-amps a low noise bipolar input op amp like the OPA1612 would give the best noise performance. He’s optimized the distortion for the OPA1612 into the TPA6120A2 for lowest distortion and that’s not what I’m about. Dual customzied solution will give unmeasurable distortion (possibly -180db). I went through several iterations and settled on JFET buffers to raise the input impedance. 000015% at 1 kHz. 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. Feb 11, 2021 · 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. 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. 5 V - single supply - I would not be surprised to find some common-mode issues. I do reverse the loudspeaker leads when listening to the B1K to maintain signal chain polarity. Jun 30, 2021 · I would like to thank Carlos from Burson Audio for making this review possible. 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. 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). Mar 17, 2019 · TI's SoundPlus opamp family are astonishingly superb designs. Also, I using CT7601 USB UAC2 because of cheaper and less current draw. Some people have more recently started using OPA1656, which are very good, although they are a little less authoritative in the bass. 7 EUR at Mouser. OPA1612 and OPA1656 and I recognosize the blue backgroung in the back of the opams,could they Jul 5, 2006 · Since CMOS parts tend to top out at a mere 5. 000 (DIY!) tube preamp with tube Jan 5, 2020 · Of course, I do not go to use "special" $4 LDO from ESS when I can take opa1612 and get less noise. Aug 22, 2009 · I just noticed today on the TI web site that the OPA1611 (single) and OPA1612 are finally reality. I've seen mention of these on various threads in this and other forums. But I would have to convert the SOP8 socket to DIP8 first with limited space. Yes, I know everyone likes to think you need GHz op-amps for I/V. ••• Jul 5, 2006 · Featured Vendors The diyAudio Store Parts Connexion miniDSP DIY HiFi Supply. Apr 7, 2019 · Unpopular opinion- If you are talking about measured performance in the audio band, it probably is OPA1612 or LME49720. TI was going to discontinue the LM4562 and others as well. Dec 11, 2019 · It's a killer OpAmp, and better suited to non-inverting buffer duties than the OPA1612/2211. But, for me, I simply don’t care for monolithic OPAs. May 9, 2023 · Which of the two mentioned OP Amps (OPA1612 or OPA1656) is the better one, in a scientific point of view. (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. He does test the TL072 against some more modern ones, but not the OPA1612 due to there being no DIP version I think. Jan 6, 2020 · So, you try different devices and measure. It has the most stable input capacitance vs. Jul 4, 2021 · The article linked below isn't the be-all and end-all on op amps tests, but very informative. Members Market Swap Meet Group Buys. I payed 6. May 23, 2018 · Opa1656 and opa1612 without tweaking have better performance than almost any discrete solution. Pin can be left floating or connected to any voltage between (V–) and (V+). Just did an A/B with 2 opamp buffers on my Hypex NC500 monoblocks, which I normally use with no buffer, as the dac has enough gain to drive the NC500 modules direct. More options Share OPA1611, OPA1612 www. Mar 17, 2019 · Voltage noise is higher on 1656 at low frequency til 1khz. It's best use as an alternative to opa1612 when noise is not a big concern. How much noise and how much distortion you tolerate? The reason I chose the OPA1612 is for it's noise and high open-loop gain. Nov 17, 2017 · I'm trying OPA2134, witch output stage is the same as OPA1612, and I'm not satisfied at all. Use a simple resistor, or a J-fet with the IDSS trimmed to 3mA~5mA. So i expected to get fakes but i wanted to know it for shure. First project :: XU216/AK4499/OPA1612 :: DAC Pinout & circuit examples. 91 mm Dec 31, 2018 · Personally I use OPA1612 in my design, but I haven't realised it (I had a very busy year due to my masters program and job). While improving on the flaws, some of the IC's SMD legs gave up and broke off. I have a Technics MASH cd player with the SMDs type of opamps needed. I got free shipping with Element14 till 29th of this month 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. 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. BTW, last year I crippled my €4. 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 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). 707dBc=0. IMHO the outcome was mostly decided by how the opamps responded to the RF coming out of the dac chip. PCM1794, OPA1612 . 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. LME49720 sound is boringand too light. Nov 9, 2012 · Muses02 vs BB OPA2134 in Topping A30 (single-ended to differential buffer) Rig includes: Topping A30 and D30, HD600s (vintage 2017) with HD650 (genuine Sennheiser replacement part) 3m cable (1. I opened one SO-8 package and put it under the microscope in our workshop. The OPA1612-Q1 device is available in a SOIC-8 3. Regarding a review, do you have a decent equipment to evaluate my ADC performance yet? 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). Custom Input Buffer Board w/: 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. 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. CMRR is not a big issue. common mode voltage that I've measured on any op amp. 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. Jun 8, 2023 · THD=-117. With a low price and nevertheless minimum THD. I checked all resistor values according to the following OPA1611(single version of OPA1612) schematic and found out that the 8200pF capacitors were actually 220pF(marked on board as 820pF) and the 2700pF were actually 270pF(marked on board as 270pF). I must test muses now. LME in other hand, has common collector, so it is better for loads like DAC AVCC, I believe. He gives strong recommendations for some applications and also caveats about ill-informed op amp rolling. The OPA1611 (single) and OPA1612 (dual) bipolar-input operational amplifiers achieve very low 1. 1-nV/√ Hz noise density with an ultralow distortion of 0. 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. 80 EUR for all ten. What's not to like with that, and all the other SoundPlus family? Craig ••• 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. lwgfavnbburgmzwzuvglynefdwxytcshpbrbdistrbeixomp