Opa1656 review forum. May 2, 2020 · There are many reviews of audio hardware and expert members to help answer Group Buy finished amp + Buffer OPA1656 : free shipping to Europe. Active Member Forum Donor. Forum Donor. I looked at the Slew Rate as my main Aug 26, 2020 · I pasted below my review of the A07 from earlier this month. Two identical gain 11 amplifiers were tested. Amplifier: Bamboo V2 3E Audio 260-2-29A Stéréo REB B (OPA1656) The OPA1655 and OPA1656 (OPA165x) are Burr-Brown™ op amps designed specifically for audio and industrial applications, where maintaining signal fidelity is crucial. One thing is that TI is not sending samples when request comes from private mail services like gmail and similar. It offers exceptional performance in almost any audio application. Opa1656 has good phase response at high frequency. I am planning to replace the NE5532 in my Burson Funk with the OPA1656. Here are the measurements of the dual mono and with different op amps (Sonic Imagery 994, OPA1656, LM4562). A possible solution would be to lower the positive feedback capacitors and increase the resistors such that the op amp isn't driving large capacitive loads. Since the 3rd and 4th stage noise is so insignificant, a low noise op amp such as the OPA1656 provides no benefit there. Oct 12, 2020 · The AIYIMA Tilear Rev 2. Talking about AIYIMA A07, it will end up in a dustbin soon. ” To hear Bruno's discussion on OPA1656 scroll forward to 33. 9‑nV/√ Hz voltage noise density and 6‑fA/√ Hz current noise density, allowing for very-low noise performance in a wide variety Sep 6, 2023 · I was using opa1656 with fosi v3 ever since I got the uni. Every amp. May 9, 2023 · 2. Desire to learn and share knowledge of science required. The low offset would make the reduction in swing before clipping at the output of the second stage due to the DC gain of about 1000 for MC essentially 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. 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 Feb 17, 2020 · In principle all variants should sound transparent, but you have the option to change the Audiophonics OP amp if you want. I don't care about listening tests or something else, just want to use the technical better one in my amp. Joined Nov 8, 2018 share a test between OPA1612 and OPA1656. Which of the two mentioned OP Amps (OPA1612 or OPA1656) is the better one, in a scientific point of view. 9‑nV/√ Hz voltage noise density and 6‑fA/√ Hz current noise density, allowing for very-low noise performance in a wide variety Apr 26, 2020 · I am understanding that the array you mean is relating to the three chips in the DA10 - so looking at your tables you have 2 AD797(x2) in the I/V stage with 1 OPA1656 as the Buffer, together making up the "buffering output high quality DAC", so AD797(x2)x2 -> OPA1656 ? Dec 10, 2021 · This is my first time doing anything DIY with audio. Historically, we utilized the OPA1612, but transitioned to the OPA1656 due to its slightly superior measurements and preferred auditory qualities reported by some users. doug s. Just getting a better (cheap) opamp worth it. Are there any other Dec 21, 2020 · The OPA1656 will perform better in many applications. Personally, I would not expect an improvement with all OPA1656! But if you already have another pair of OPA1656 them give it a go, and then ask yourself if you really want to keep them there! Feb 20, 2021 · WANTED: Happy members who like to discuss audio and other topics related to our interest. Other candidates are muses8920 which is almost as powerful and lower distortion. I've had the Burson V5i, and the V6vivid and I have no space to put a sparkos labs opamp single or dual channel. I used 10 or 12 in my preamp rolling project - never a problem with Mar 17, 2019 · I purchased 10 OPA1656's. Feb 2, 2019 · To compare : OPA1656 bring the Bursons V5I to their knees as well and keep in mind : Burson V5I = $70 vs $10 for OPA1656 OPA1656 is a ultra low noise fet operational amplifier and delivers a low distortion of 0. I used the attached blank proto board. So we stuck with the OPA1656 (it actually had slightly better noise measurements over the 1612 once put into the full design). Mar 17, 2019 · Benefit is lower dc offset and less distortion also high open loop gain also superior stability. I did build that and the slightly modified schemo is attached. If I'd imagine, the njm4585 is a tiny little sticky sounding in the highs and less clean. It is important to use the OPA1656 in both the first and second stages. Jan 15, 2020 · Let's test this out! AnalogSteph had recommended the OPA1656. Dec 28, 2018 · I would like to see the OPA1656, a burr brown sound plus chip. 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. D. 1 is now ready with OPA1656 in DIP8 socket. Not only was that affordable, I could trust that the op-amps would be legitimate. My plan is to use these amps to build some active/passive monitors. Both methods generally increase open loop gain up to around 65 - 100 kHz then it will taper off more quickly than a traditional single order compensated opamp. PRODUCTION DATA. There are many reviews of audio hardware and expert members to help answer your questions. Jan 9, 2020 · OP amps : Remove NES5532 Op amps > Install Genuine OPA1656 DIP8 socket (mouser) Will let you know more when the amplifier is going to be fully assembled ) Stock version A small 110*70*35MM TPA3255 module with : SAGAMI 7W14A inductors Full Nichicon caps, as below : Nichicon 2200UF/63V VZ serie power caps Nichicon FW serie Buffer caps (Audio Grade) Dec 10, 2023 · This is a review and detailed measurements of the 3e Audio 480-1-29A, TPA3255 based class D amplifier module. And opa1656 and opa1612 doesn't sound any different. Forum Donor Jan 27, 2024 · The advantage of OPA1656 is that it has JFET inputs rather than bipolar, so its input bias current is much lower, making it easier to keep the output DC offset low in some applications. The FET-input architecture achieves a low 2. 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 Mar 27, 2019 · OPA1656 / OPA1612 / Burson V5i / OPA627 / Genuine NE5532 / Genuine Muse 02 / 0PA1622 / OPA1642 / OPA1602 The question of Op amps has already been debated on DIY audio, and I had used the OPA1656 and I think the opinions are unanimous, these Op amps are very good and seem to work the best with those amps. It was sent to me by the company in a reference design for ease of testing: View attachment 332950 Nov 30, 2021 · For example, Aol for the OPA1656 with a 600 ohm load will have a linear output swing that is 1. So maybe they shouldn't be used on a dip8 converter. There are many dual opamps to choose from. I found the Bass being sweeter, the fact you can juggle the equalizer is really fine and brings something very interesting. 000035% (–129 dB) at 20 kHz If you love the OPA1612 you will love the OPA1656 too. (or the 2156) The opamp has good phase margin and seems quite tolerant of sub-optimal layout. 2 and the 48v 7. (See diyaudio. Dec 6, 2018 · I don't think you can "get into it" here, it quickly degrades to psychoacoustics and audiophoolery compared to science. Just learned how to fix my Oct 6, 2023 · There are many reviews of audio hardware and expert members to help answer your questions. 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. Jun 20, 2023 · But no matter if they are original or not. Great alternative to TPA325X / Hypex Ncore (this is subjective ) is the double Mono Merus amp. The input is essentially shorted with 10mohm resistor in order to have a -140db control signal. Apr 29, 2024 · There are many reviews of audio hardware and expert members to help answer (OPA1656) + PFC/LLC PSU. Audiophonics uses TI-LM4562 by default, which on paper has slightly lesser specs than the OPA1612 and OPA1656 which are used in the other custom implementations (EVAL, VTV, Neurochrome, BoXem etc). Joined Nov 8, 2018 Messages 170 (OPA1656) + PFC/LLC Jul 4, 2009 · I'm gonna get the 1656 samples next week and have my surface mounting friend get them on dip adapters. 53 MHz gain bandwidth product, 24V/us slew rate. 6 fa/rtHz broadband current noise. In the grand scheme of things, both are ideal choices. Marketing 101 by 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 Apr 29, 2024 · Test protocol: Audio Analyser 1 : APx555 + Passive filter (Aux-0025) Default filter : AES17 20Khz. CMRR is not a big issue. I wasn't compensated by anybody in any way. *****!!! 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. But I would still like to see the OPA1656 tested. Aug 3, 2024 · Sticking with the OPA1656. LME47920, LM4562, OPA2134, OPA2132 DIP8 opamps, or SOIC8 on adapters like OPA1656, OPA1678. PS: boXem has been using OPA1656 since the beginning. #1. Jan 15, 2023 · our amplifiers standardly employ the OPA1656 op-amp, with the exception of our premium stereo and mono block models, which come equipped with the Weiss OP2-BP op-amps by default. I think it's a matter of circuit design and implementation. Sep 17, 2023 · I was using opa1656 with fosi v3 ever since I got the uni. On the α24, this is a non-issue. The OPA1655 and OPA1656 (OPA165x) are Burr-Brown™ op amps designed specifically for audio and industrial applications, where maintaining signal fidelity is crucial. Oct 17, 2023 · Like a number of forum members, I have been anxiously awaiting the review of this 3eaudio amp. Composite amplifier is one of the best application with opa1656. 5Vrms signal, 80-kHz measurement bandwidth. Dec 7, 2023 · There are many reviews of audio hardware and expert members to help answer your Forum Donor. Especially the last one seems promising but first I need better test equipment to analyze such small distortion levels. I cannot recommend a 48V power supply because of the A07 internal temperature with the 48V PSU, in case I Mar 17, 2018 · Finally I decided to nest already very good TPA6120A2 inside feedback loop of another operational amplifier. their EVAL 1-3 boards use the 1612 and their EVAL4 board uses the 1656. Again, from known dealers or vendor like Digikey or Mouser, not Ebay or Aliexpress The OPA1656 is the industry’s lowest voltage noise high voltage CMOS on the market. Hello together, i want to put one of the mentioned OP Amps in my amp. OPA1656 Welcome to r/guitar, a community devoted to the exchange of guitar related information. I felt a great improvement overall. 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. May 2, 2020 · Hi amigos, New Purifi Buffer in V2. The OPA1220 would be quieter than either of them for MC, still not quiet though, and would definitely be better than the LM4562 for MM. 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. Tried putting in opa1612 today. “Rules for Official Review Threads” “Forum Terms and Jun 20, 2023 · When I first got my A07, i fell down the opamp rabbithole. "With the 4 OPA1656, compared to the AIYIMA TPA3251. Last edited: Sep 7, 2023. Sep 14, 2021 · I have an OPA1656 story that may be interesting especially to whomever wants to build the RIAA preamp example in the apps section of the data sheet. I would check the amp out, if its character is basically to your liking (incl. Mar 17, 2019 · OPA1656 rolling I tried in all cases to bypass the rails with a 0. Nov 28, 2022 · Part Number: OPA1656 Other Parts Discussed in Thread: OPA192 , , OPA551 , OPA547 , OPA593 Dear members: For a measuring circuit I need an operational with output TI E2E support forums Search Sep 7, 2023 · On paper the OPA1612 is better but the OPA1656 has higher and much more linear input impedance which in a number of applications performs better. Try for yourself. -131 dB THD+N at 1kHz, 600 ohm load, 3. This is a forum where guitarists, from novice to experienced, can explore the world of guitar through a variety of media and discussion. 9‑nV/√ Hz voltage noise density and 6‑fA/√ Hz current noise density, allowing for very-low noise performance in a wide variety 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, Mar 21, 2023 · Since the OPA1656 GBW is much larger, this is the reason we suspect the issue is possibly due to stability. APx555 Mar 30, 2020 · Test 1 : Leaf DAC + 5 stock OP amps / 2 OPA1656 + Hypex Ncore amp > XLR Test 2 : Leaf DAC + 7 OP amps upgrade + Dual TPA3221 > RCA For the moment I rather test the inputs and the possible configurations with the OP amps. Nov 8, 2022 · The OPA1656 noise for MM would likely be a bit better. Below is a comparison between OPA1656 and OPA1642. The latter method used in SIL was first used in the famous (Deane) Jensen 990 discrete opamp many years ago. Transparency got way better. I had no oscillations or instability with the OPA1656. Even a TL072 would not increase noise significantly, and a bipolar amp such as the NE5532 would be even better from a noise/cost perspective. Thanks in advance. Dynamics felt better, bass felt more defined and the upper midrange seems to have more air. 5amp power supply. 1 with great caps and some mod (OPA1656 / inductors update) sounds really good too. 1 with the following OP amps : OPA1612 OPA627 OPA1656 Burson Audio V5I genuine Jan 10, 2021 · There are many reviews of audio hardware and expert members to help answer Muses02, opa1656 sounds better . I prefered the sound of my DAC with the OPA1656's hands down even over the discrete op-amps. The cost is about $30 in a local store. Of the three Oct 22, 2020 · I found your review of the BRZ TPA3255 from May 2020 in the diyaudio forum and there you praised it and said it's dead silent. Jan 7, 2021 · I have ordered Mean Well RS-100-24 SMPS power supply, 24V/4. Measured at non-inverting gain 40dB and 3. This chip doesn't fit in the common DIP8 packaging, but thankfully @Audiophonics sells a pre-modified OPA1656 for 5 €. Jun 2, 2019 · Of course. Opa1656 is pretty good with 100ma. Mar 17, 2019 · A quick snapshot of the OPA1656 performance specs: 2. >100mA output current. As expected, it measured very well and I now have 3 amps on order (2, 480-1-29A, 1, 260-2-29A). Since I am not interested in the V6 Vivid Dual that it comes with. 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. But I experience some stability issue and over heating. 4Vp-p output. May 23, 2018 · The third time I added in njm4585 very cheap but pretty good opamp in the comparison. OPA1656 is a bit noisy at low frequencies. The diyaudio forum might be better suited for posing the question. Opa827 was my favorite but expensive and doesn't have much current. There is basically no difference between njm4585 opa1612 and opa1656. Joined Nov 8, 2018 (OPA1656) + PFC/LLC PSU. 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. I have a Boxem 4215/E2 Purifi amp with the TI OPA1656 and a March Audio P452 with the OPA1612. Feb 11, 2021 · Yes. consists of 2 x 10 op-amps in parallel and the two 10s are balance connected. 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 Jul 4, 2009 · There's a thread on DIYaudio about the OPA1656, with a guy from TI telling very useful things. 5V inside of the positive rail . Well, if I was imaging all those above, then i was. 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. 2V inside the negative rail and 2. 01 in the video below. He suggested to buy the parts direct from TI. I will measure the A07 output power and spectrum cleanliness with this power supply. Sep 20, 2023. I’m going to solder the IC to a soic to dip adapter then plug it into the the amp. You can dig on the Internet and find modern op-amp test results, but it quickly crosses over into sonic character and subjective opinion. com) I have tested the The AIYIMA Tilear Rev 2. The Layout is attached. It's a virtually unknown chip as when you search on Digi-Key it doesn't come up as soundplus. Soundstage and placement felt more solid. At this time I'm using OPA1602 but want to experiment with something else like OPA1652 or OPA1656. Joined Aug 3 Dec 28, 2018 · Opa1622 is supposedly a better choice. Aol for the OPA2134 with a 600 ohm load has an output swing that is 2. Only companies. 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. If you have guitar related questions, start with the "search" field at the top of the page. It's best use as an alternative to opa1612 when noise is not a big concern. Aug 20, 2023 · My personal OP amp preference for the Fosi V3 are Ti OPA1656 but others have different preferences. There was also a little bit of confusion when talking with Purifi. 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 Apr 1, 2024 · Note my italics! I haven't had time but I'm going to write a post on this on the user impressions. Aug 20, 2023 · Edit: After playing them back and forth for a bit, i swapped the OPA1656 back in and actually prefer it over the SS3602, the OPA1656 seems to have a lot more detail and transparent than Spanky, not to mention the OPA1656 is what Bruno recommended anyway, the Spanky just doesn't seems to be a good match with this 1ET7040SA. Is the OPA1656 the correct opamp to use? I heard it was the best so that’s why I picked it. 5A. Dec 11, 2019 · The SIL uses small inductors on IP transistors. 1F X7R on the backside with the shortest possible lead length. May 20, 2024 · There are many reviews of audio hardware and expert members to help answer your questions. 9nV/rtHz broadband voltage noise. 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. 3V inside of each supply. odddvprhyhecgylnrywyztdbtibygcotsrqpugevvhqc