Opa1656 review reddit. Get support, learn new information, and hang out in the subreddit dedicated to Pixel, Nest, Chromecast, the Assistant, and a few more things from Google. But that does not say anything about the SQ. I plan to use M3 screws with spacers and washers to fasten the board to the case. I did an A/B comparison to LME47920 (metal cans), burson V5i, V6 and also the Sparkos Pro discrete op-amps on one of my DAC's. In conjunction with the UHGF (Ultra High Gain Feedback) topology, this ensures an ultra-low noise floor, where noise levels are recorded as just 0. There was also a little bit of confusion when talking with Purifi. Question 1: yes, positive L and positive R are the right terminals for mono. I have the Opa1656 and it’s fantastic! I’m dying to try the Opa1692 as I’ve heard it’s nice sounding and more importantly great in the voltage stage of your rig. May 23, 2018 · The first time I did test with opa1642 opa2156 (precision opamp version of opa1656) opa1612. i am not able to answer whether can get genuine opamps from Aliexpress,but should pay attention and check their feedback before place order. ' It's a good opamp. com with a TI insider involved. The OPA1655 and OPA1656 (OPA165x) are Burr-Brown™ op amps designed specifically for audio and industrial applications, where maintaining signal fidelity is crucial. Jul 4, 2009 · Marketing 101 by having one of the engineers on the diy threads because it creates interest (especially from spec crazy diy-ers who “need” the lastest and best specs and use “word of mouth” via the audiophile threads to push cost up by popular demand) They do outsource them to official distributors ie Mouser, Digi-Key but you have to buy them in bulk (we’re talking 100s to 1000s) and Thanks! Most of these opamps don't seem easy to find in Europe (at least not on my usual electronics suppliers). 1F X7R on the backside with the shortest possible lead length. Jun 20, 2023 · When I first got my A07, i fell down the opamp rabbithole. OPA1656 Performance of OPA1656 is better, there's about AUD3. -131 dB THD+N at 1kHz, 600 ohm load, 3. I prefered the sound of my DAC with the OPA1656's hands down even over the discrete op-amps. 2 and the 48v 7. It has a very good dynamic range and a low level of harmonic distortion. Dec 11, 2019 · The OPA1656 immediately raised my attention, plus there was/is a long thread about it on diyaudio. There are many cheap opamps to try. But I would still like to see the OPA1656 tested. 9nV/rtHz broadband voltage noise. (or the 2156) The opamp has good phase margin and seems quite tolerant of sub-optimal layout. May 24, 2023 · I would give OPA1652 and OPA1656 (and maybe OPA1688) a closer look as well. I would check the amp out, if its character is basically to your liking (incl. Just learned how to fix my Mar 17, 2019 · Benefit is lower dc offset and less distortion also high open loop gain also superior stability. Facebook Twitter Reddit Pinterest Aug 26, 2020 · I pasted below my review of the A07 from earlier this month. 25 V to ±18 V (4. Aside from that, identical path. I had no oscillations or instability with the OPA1656. 5A. Composite amplifier is one of the best application with opa1656. We would like to show you a description here but the site won’t allow us. APx555 Measurements ) Oct 22, 2020 · VS AIYIMA A04 (black PCB Tilear 2. I use one amp and I don't have any imbalance and it provides more power than what I need. Aiyima have confirmed they are the same analog linear potentiometer as the V3 but the sensitivity of the A07 MAX is twice that of V3, so while the A07MAX volume is nicer than previous Aiyima Amps but IMO the volume on the V3 is slightly nicer and it is very subtle with lower Jul 4, 2009 · on first sight i would say the opa627 has these attributes compared to the opa1656 - sounds somewhat thinner, voices sound more lean but at the same time a bit more sibilant - you could say its a bit more analog sounding - not so bass heavy as the opa1656 (the 1656 really shines in bass regions, specially infrasonics are much more "audible") Mar 17, 2019 · blue spectrum - 2 x 8 parallel OPA1642 , green spectrum - 2 x 2 parallel OPA1642 orange spectrum - 2 x 8 parallel OPA1656 , brown spectrum - 2 x 2 parallel OPA1656 Based on these measurements I expect the noise of a single OPA1656 to be 39nV/rtHz at 10Hz. Even the bipolar OPA1662 would have a more suitable en/in balance than the stock LME49720. Volume control on the V3 is more subtle control over lower volumes. It's a killer OpAmp, and better suited to non-inverting buffer duties than the OPA1612/2211 The OPA1655 and OPA1656 (OPA165x) are Burr-Brown™ op amps designed specifically for audio and industrial applications, where maintaining signal fidelity is crucial. The OPA1656 is the industry’s lowest voltage noise high voltage CMOS on the market. It's a jack of all trades so to speak, and this is the op-amp I was able to compare and contrast the V6 Classic to. This OPA1656 OPA from Texas Instrument offers very good performances for audio use. Aug 21, 2024 · Headphone Stage: Booster based on OPA1656, 150mW typical max output Volume Control : relay-switched stepped attenuator with discrete thin-film 0. PRODUCTION DATA. 5amp psu and opamps rolled from NE5532(people say they are fake anyways) to OPA1656. Transparency got way better. Taking advantage of a wide power supply range and mounted on a DIP8 bracket, it can replace many other models. Tried putting in opa1612 today. It offers exceptional performance in almost any audio application. Mar 17, 2019 · OPA1656: High-Performance CMOS Audio Op Amp see RCA review from 1968 as one example. The idea of this group buy is to propose a full pack @fair price for a brand new Purifi Buffer : SPEC : - THD: 0,00026% @ Vin 2,5 V RMS - GAIN: 14 dB - BANDWIDTH: 2 Hz - 150 kHz - SLEW RATE: 24 V/uS - CMRR Mar 17, 2019 · OPA1656 rolling I tried in all cases to bypass the rails with a 0. Their MOSFET input with very low common-mode modulation of input capacitance should be a good match to the highish-impedance circuit. Mar 17, 2019 · To start, OPA1656 is definitely not a replacement for OPA1622, the two parts were designed for with very different applications in mind. Jun 2, 2019 · Of course. I think it's a matter of circuit design and implementation. 5kHz (aggressive I know, but it sounded good to me and made a big difference with the noise) the May 20, 2024 · WANTED: Happy members who like to discuss audio and other topics related to our interest. It's a virtually unknown chip as when you search on Digi-Key it doesn't come up as soundplus. I looked at the Slew Rate as my main Apr 29, 2024 · Test protocol: Audio Analyser 1 : APx555 + Passive filter (Aux-0025) Default filter : AES17 20Khz. Jul 22, 2020 · Hi all, I did some un-recommended opamp experiments with the D10s and would like to share them; I tried OPA627(two opamps for dual) the result was warm and smooth overall sound pleasant to listen to a bit fewer details from stock LME49720, the second try was with OPA1656 which is going stay! with OPA1656, there is an immediate improvement, more overall details and transparency highs, bottom Jun 29, 2021 · TOPPING DX7 Pro のオペアンプを交換し、組み合わせを試し、理想の音質へ近づけました。LFP × AMP①MUSES01 × LME49720②MUSES01 × LME49722③LME49722 × LME49722④MUSES01 × LME49990⑤MUSES01 × OPA1656⑥THS4651 × LME49990⑦THS4651 × OPA1656MUSES01は前記事にも書きましたが、最初に聴いたときは美音が衝撃的でした。相手となる Aug 3, 2024 · Sticking with the OPA1656. The FET-input architecture achieves a low 2. Mar 17, 2019 · I purchased 10 OPA1656's. DI-Harris-Pat-1987. Sep 6, 2023 · I was using opa1656 with fosi v3 ever since I got the uni. Spec : Fully balanced Dual 1ET400A Purifi modules Hypex SMPS1200A400 PSU Neutrik XLR inputs Sommer Cables Germany Custom Buffer OPA1656 DIP8 Second alu plate for heat dissipation Buffer Spec : - THD: 0,00026% @ Vin 2 Dec 28, 2018 · I would like to see the OPA1656, a burr brown sound plus chip. 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. 5a OPA1656/ ELAC B6 but there is a few Mar 17, 2018 · Finally I decided to nest already very good TPA6120A2 inside feedback loop of another operational amplifier. The cost is about $30 in a local store. Desire to learn and share knowledge of science required. Opa1642 sounds a bit smoother and silky at top end but a little bit fat in the mids. Oct 11, 2022 · The only diff in routing is the signal passing through an OPA1656 and some extra coupling caps before going to the volume pot. OPA1656 1/2 OPA1656 Input Output Pad Product Folder Order Now Technical Documents Tools & Software Support & Community 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. At this time I'm using OPA1602 but want to experiment with something else like OPA1652 or OPA1656. I don't care about listening tests or something else, just want to use the technical better one in my amp. Attachments. 5amp power supply. 3E Audio 260-2-29A Stéréo Rev. 3. just going by specs it should be better but i dont hear much, its def louder tho so if thats what you want Feb 10, 2020 · And I've tried many Opamps as well: the stock 5532, some directly purchased from TI 5532P and 5532AP, LME47920, LM4562 and finally some OPA1656 and OPA1612 on adapters. My first set of separate OpAmps, ushering my foray into the brave new world of OpAmmetryLoL Dry, crisp, analytical and non-intrusive (as compared to the bold NE5532) is what I would describe this opamp as. 9‑nV/√ Hz voltage noise density and 6‑fA/√ Hz current noise density, allowing for very-low noise performance in a wide variety Jul 4, 2009 · I'm gonna get the 1656 samples next week and have my surface mounting friend get them on dip adapters. Apr 29, 2024 · "Bamboo V2" project. >100mA output current. Mar 17, 2019 · @johnc124 The circuit in this thread, OPA1656 Phono Preamp: Split from OPA1656 thread, clearly has a negative real part of its input impedance at high frequencies. Nov 24, 2022 · The OPA1656, the ones i got which i think are genuine but i didn't buy them from a certified TI distributor, isn't all that different from it. Apr 18, 2021 · Technical parameters Hel 2 uses the AKM AK4490 D/A converter with TI OPA1656 based filter stage and an output with 4 amp stages per channel. Mar 28, 2022 · The OPA1656 can deliver 100 mA of output current, so it should be able to drive a headphone load. 9 mA of supply current to accommodate the power supply constraints of many types of audio products. 5 V to 36 V) on 3. Feb 11, 2021 · According to the TI datasheets OPA1612 has less noise than OPA1656. B (OPA1656) + PFC/LLC PSU. 53 MHz gain bandwidth product, 24V/us slew rate. The low voltage noise combined with the low current noise make this device great for low and high impedance applications such as a high gain microphone pre-amplifier. Though I use it only occasionally mostly for tests, and it has not operated more than a couple of hours summed, the right channel started to emit high frequency hiss noise time after time, without any special reason, even if nothing is connected to the input. Mar 17, 2019 · A quick snapshot of the OPA1656 performance specs: 2. Dec 9, 2019 · 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, unless swapping opamps is really fun for you and you have enough money to spend on this hobby. using OPA1656 for first 2 stages and LM4562 for stage 3 & 4: 5. 6 fa/rtHz broadband current noise. 3V rails 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. Note that while the OPA1656 is unity gain stable, it does have an internal compensation circuit that causes a phase wobble in the 1-10 MHz region. Soundstage and placement felt more solid. May 7, 2018 · 2. It has the most stable input capacitance vs. Mar 17, 2019 · The OPA1641 would be slightly better. I wasn't compensated by anybody in any way. Dynamics felt better, bass felt more defined and the upper midrange seems to have more air. Sep 27, 2019 · The OPA1656 operates over an ultra-wide supply range of ±2. opa1655 , opa1656 SBOS901C – MARCH 2019 – REVISED SEPTEMBER 2022 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, Feb 23, 2019 · This is a set of measurements of 19+20kHz IMD distortion of the following opamps: AD4627, ADA4898, AD8597, OPA140, OPA141, OPA1641, OPA209, OPA1611, OPA637, NE5534. their EVAL 1-3 boards use the 1612 and their EVAL4 board uses the 1656. Both fet based opamps sounds a little bit more solid in the bass (not quantity but the imaging and the texture). The (un)official home of #teampixel and the #madebygoogle lineup on Reddit. 9‑nV/√ Hz voltage noise density and 6‑fA/√ Hz current noise density, allowing for very-low noise performance in a wide variety Sep 14, 2021 · Yes, the low pipe organ pedal notes down 'round 20Hz are rolled-off at 20dB/decade below that of the mid-band 1KHz level during the cutter/mastering process. JPG. common mode voltage that I've measured on any op amp. Any chance you have some measurements of the OPA1612 compared to the Sparkos SS2590 for the regular dual mono? I was also curious how many of the SS2590 opamps are. Measured at non-inverting gain 40dB and 3. Review. 5% resistors, 64 1dB steps Power Supply : Wall wart, 24VAC/6VAC, internal +45V/-28V and 5V/3. 4Vp-p output. Here are the measurements of the dual mono and with different op amps (Sonic Imagery 994, OPA1656, LM4562). Jul 4, 2009 · In my particular amp, opa1692 has narrower sound stage than opa1656, as 1692 is designed for portbable use with trade-off (low power draw). 1 is now ready with OPA1656 in DIP8 socket. The OPA1656, OPA1612 (the ones I'm currently using) or a low noise NE5532AP (if you really like the sound from the stock opamps). Oct 8, 2023 · The advantages of the V3 compared to the MAX: 1. Amplifier: Bamboo V2 3E Audio 260-2-29A Stéréo REB B (OPA1656) Jun 27, 2021 · This particular implementation utilizes 10 pcs of OPA1656 op-amps. There are many reviews of audio hardware and expert members to help answer your questions. CMRR is not a big issue. I used 10 or 12 in my preamp rolling project - never a problem with depends on the amp your using fosi makes a ton , assuming its the TB10D (upgraded version) with a tpa3255 it will just give you headroom that most people wont need. the default NE5532 OP amps supplied) and have - alternatively - a look at some of the rather "cheap" integrated OP amp alternatives, which fit the V3 sockets from Jan 7, 2021 · I have ordered Mean Well RS-100-24 SMPS power supply, 24V/4. i have a a07(tpa3255 also) with 48v 7. Digikey seems to have the OPA1656 (for a bit over €2 each, which is great, though shipping might be quite a bit more than that), unfortunately they only seem to have it with SOIC mount and not DIP. My OP1656 OpAmp Review. Can that also happen with an OPA1656 voltage follower (that's what it is at high frequencies) when the board layout is perfect, or does it require a less than ideal layout for that? Oct 17, 2023 · OPA1656 will be be cheaper than OPA1612 and performance very close. I felt a great improvement overall. there is also much talk about the NE5532 being fake also and i ended up going to OPA1656 on DIP8 sockets im not a expert but i feel it sounded better with my ELAC debut b6. Elac Debut B6. The op amp offers a temperature range of -40°C to +125°C and is available in an 8-pin SOIC package. Aug 20, 2023 · My personal OP amp preference for the Fosi V3 are Ti OPA1656 but others have different preferences. I use two OPA1656 in parallel in the HP-2. To help others to understand what other audio components are being used, a SML SU-6 and SH-6 are used. 00006%. 9‑nV/√ Hz voltage noise density and 6‑fA/√ Hz current noise density, allowing for very-low noise performance in a wide variety Jun 3, 2021 · My benchmark standard op-amp is the OPA1656 which is not the widest sounding, but it's tight, somewhat linear and has a good balance to the sound. View attachment 106010 I will measure the A07 output power and spectrum cleanliness with this power supply. View community ranking In the Top 1% of largest communities on Reddit. May 2, 2020 · Hi amigos, New Purifi Buffer in V2. However, there really will be very little difference between it and other high performance opamps. I've been using mostly LM4562, except when I need a JFET opamp (high impedance inputs for example). 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. Opa1656 has good phase response at high frequency. OPA1622 was targeted specifically for headphone applications, while OPA1656 is a more general purpose device meant to address analog signal processing in line level audio circuits. May 9, 2023 · Which of the two mentioned OP Amps (OPA1612 or OPA1656) is the better one, in a scientific point of view. May 2, 2020 · Best price in Europe = Audiophonics = 1500 euros without OPA1656 ) My price : 999 euros with OPA1656 if I sell at least 4 units. Mar 17, 2019 · Last week TI put a preliminary datasheet online for the OPA1656, a low noise, very low distortion op amp targeting audio applications and fabricated in a CMOS process. It outperforms most other opamps, very low noise & distortion, doesn't color the sound whatsoever. 5Vrms signal, 80-kHz measurement bandwidth. 3µV, which translates to a THD+N of 0. It'll struggle a bit with 33 Ω load, though. Coupled with an Alps RK09 potentiometer, high-quality filter and amp stages from Texas Instruments, a sophisticated bipolar +/-12V supply, and precision thin-film resistors and film capacitors, Hel 2 delivers amazing performance for its price. 4 mV With the same configuration as above but reducing the feedback resistors by a factor of 10 for the first 2 stages, and increasing the bandwidth limiting caps to a frequency of 7. Especially the last one seems promising but first I need better test equipment to analyze such small distortion levels. So we stuck with the OPA1656 (it actually had slightly better noise measurements over the 1612 once put into the full design). MA12070 chip only accepts differential input so the OPA1656 makes an extra 'signal. 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. 00 difference between the two and my production run will likely be less than 5. in order to resurrect those signals the preamp applies a maximum gain of 1000 b/c the basic mid-band gain must be ~ x100. 2 or Canton GLE 20 ESS/A07 48v7. 1 with OPA1656) - concerning the overall listening, I think that we are rather on amps of the same range, I found the 3E Audio a little less "alive" than my AIYIMA but I think that the OPA1656 are there for something (I did not test the 3E Audio + OPA1656). It's best use as an alternative to opa1612 when noise is not a big concern. Used in this A07 Pro amp, i hear a wider dynamic range with the OPA1656 and more emphasized treble with a little better detail, along with a more defined low bass. *****!!! ROLL THE OPAMPS !!! Reviewed in the United States on July 6, 2021 Size: A07+DC 32V Power AdapterVerified Purchase A pair of *genuine* OPA1656's is the consummate and necessary upgrade for it's stock NE5532 opamps. I've had the Burson V5i, and the V6vivid and I have no space to put a sparkos labs opamp single or dual channel. In the grand scheme of things, both are ideal choices. Jul 21, 2021 · So I have a good basis to be able to compare this Poppulse) Spec : Poppulse T180 MD version Dual Mono Tripath TA2022 chip Update : OPA1656 for Output path (XLR) + OPA1692 for the preamp section Linear PSU Full Balanced inputs Unbalanced inputs ALPS motorized volume controller Anti RFI/RMI filter 2x120W / 8R Full aluminium case 412 x 340 x 80 mm Talking about AIYIMA A07, it will end up in a dustbin soon. dmbjxkk hpowb mbdiz aomjrtf bhopcm ooiry allyc dwrgl iydq bablfr