Opa1612 diyaudio. Despite my opinion even the owners of the mentioned preamps have clearly stated that. Mar 17, 2019 · 2022-07-15 7:58 pm. Aug 2, 2017 · 2017-08-02 11:38 pm. I measured from grnd of DC jack, to pin 4 (or upper pad of failed cap) is 6 ohm; to lower pad of failed cap is less than 1 ohm. Sure it's possible to use values like 0. #701. Apr 8, 2021 · This DAC is using a dual 9038Q2M chips and fully balanced and also equipped with DIP8 OP amps and removable BT module. Mouser offers inventory, pricing, & datasheets for Texas Instruments OPA1612 Series Audio Amplifiers. 7vn, not the old 4560 though Jul 25, 2016 · So for a low cost the LM4562 or OPA2134. 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. however it sounds so good now I won't bother, scopes 20khz at 35v p-p with 0. NOTE: I realize I could stick just about any dual 8pin OPAMP in place but the goal here is high quality audio performace. Cartridge load components can be altered without soldering. The TL072 is a dual opamp. For the time being : I gave a quick test with the OPA1612 / 1622 and 1656 ; I really enjoy the 1656 and 1612 both have a very linear 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. May 19, 2004 · Temporary conclusion may be OPA1612 for Springsteen and OPA2134 for Pinnock. #54. The feedback network in the inner loop is interesting, I haven't seen that exact arrangement before. Low- and Mid-Frequency Test Signals for Evaluation of Room Modes // Measurements: ESS Hump revisited // Humpify -- apply "ESS hump"-style distortions to audio files. 5v, i was searching opamps with +/-18v and Jan 30, 2019 · OP works with very high open loop gain. 5mA and in OPA1612 as ~2mA. 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). The size of the module will be 74 by 64mm as per the attached drawing. Last edited: 2021-07-24 8:05 pm. Nov 14, 2021 · To get the 6dB improvement in noise over OPAx210 likely needs ~12dB more current. Remove the cap and see what resistance is between those pads. 000015% at 1 kHz. I was going to change the HA1457 in the RIAA when I changed the EQ and gain. Unless there is another opamp wrapping around the 1622s there will be substantial output resistance after all. That tells you 2 things: we sell A LOT of chips, and even at prices you may think are low, they have decent margins. They are beautiful drivers. The 22v would that be too much for the OPA1612? The JEFT transistors are very low noise 0. @JonSnell Electronic - perhaps you used Octopart to see Mouser's stock. The opamp claims 1. Here's atch though: lm6172 works best on tda1541 because of its higher iout . So far I'm considering AD8620, OPA1612, OPA2132. Some opamps are stable up to certain load capatiance without additional isolation, up to couple hundreds of pF usually. However, on relatively simple headphones on an old NAD amp the OPA1612 is clearly a fantastic amp. 5R-AD (Dual Back-loaded Horn adding adjustable Duct, no sound absorber) nandappe. 1/3 gain and 5k loading maximum. Adding a signal @2vrms brings it up another 5 deg c. OPA1664 is in stock at Mouser as a BJT input opamp replacement. Nov 14, 2021 · As they run on a doubled clock and there are zeros inserted between each pair of data bits, simple shift registers work as RTZ FIRDACs. Hello guys, i have an old Denon PMA-980R amplifier who needs some re-caps and i have decided to make un upgrade to opamps. LF353 is still an excellent op-amp. It's like the DSC2 DACs, but with return to zero. Apr 26, 2018 · Here is my summary comparison of the 6 mystery opamps and my two reference devices. OTOH the TPA6120 gain is not needed, for controlling the distortions. Y. Which OPAMP in DAC for smoother sound TL072 or OPA1612 . It's a balanced four-tap FIRDAC, balanced to keep the load on the reference supply as data-independent as possible. Aug 30, 2020 · 2020-08-30 5:13 am. The input signals will be I2S at 3. Each of the two opamps in a dual opamp package has an output pin and two inputs. Apr 15, 2023 · A cheap Chinese DAC that cost less than $200. What do you think will be the opa1612 distortion now that the available amount of feedback at 1khz has lost 60db ? ••• Jan 26, 2012 · Also, you can try to select from 5-7pcs of OPA1612 the best one, and you'll see <-150db. I ran a double blind listening test of dual opamps a couple years ago and the grandfatherly old LF412 was shockingly highly rated. 2mA we can roughly figure out the IPS current in OPAx210 as ~0. 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. 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%). So you will need a different symbol file for the OPA891. Optional parallel input amps-. 2 things I have noted from looking at the circuit board so far: 1. Mega File Upload - hfe_technics_sl-pg440a_service. So the OPS runs likely at less than 1mA quiescent. 5%. Sep 14, 2021 · The 1656 just went berserk! “Somethings wrong and I have to use all my horsepower to fix it right now!”. Thanks for that recommendation. C. Markw4 said: We tried OPA1612, OPA1656, NE5532, and Muses 8920 opamps in Rohm BD34301EKV Evaluation Board (which came with 5532's installed). You can replace NJM2068 by LM4562. 3v Reference could be LTC6655 or maybe LT3042, something like that. That's 36dB worse than the opa1612, not 50. Jul 5, 2006 · 2009-11-28 11:25 am. A quick snapshot of the OPA1656 performance specs: 2. To maintain loop stability, output of the amplifier need to be isolated from capacitive load. OP has to be used with closed loop and here you get the "re-entrant distortion" (in your term) partly due to Apr 26, 2018 · Reference devices, in order of preference: #1 IPS6 - T4, D5, B5; Basically creates a studio monitor version of the F6 amplifier (T5, D4, B5), different but equal with the F6 holding the edge in the smile department and the M2x/IPS6 having the edge in the detail department. Thus the input common mode of the common gate should match this voltage. 47uf or a 1uf small film cap. Now I use OPA1612 for i/v and LPF, distortion is gone but sound is flat. 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). The opamp is rather meant for high gain stages (turntable, mike) in gain of 1 stages they require a >220pf across the feedback resistor (10k), or respectivly bigger for lower ohm. For resistive preamp must be use buffer. The 4 x OPA1612 in it right now sound ok. #4. 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. In the gain stage it'll probably be LM4562 or OPA2134 for now. dotneck335 said: An OPA1612 has slightly better specs than an LM4562---less noise and distortion, faster, and more output voltage swing. nandappe. ) Second were ON MJL3281A & MJL1302A which (when compared to known genuine ON 0281 & 0302) appear also to be genuine. 3 MHz. Since it's so inexpensive, give it a shot. 33 ohm and parallel more than 2 to keep output impedance low. Followed by a differential attenuator (R14/R15/P1) in a shunt configuration, damping both noninverting and inverting phase May 26, 2016 · OPA1612 makes a decent headphone amplifier. Good opamps for AVCC include OPA1612/1611 and AD797. A gain of 1000 overall, but a gain of 10 at the CFA will keep the 1612 at 100 maximum, and that’s one responsible way to do a 60dB main gain stage in a mic pre. -131 dB THD+N at 1kHz, 600 ohm load, 3. Transformers could be choosen between Sowter 9335, S&B, Silk STA-522A and others. The third one is the DAC output is NOT 0V, it is AVCC/2, 1. Mar 17, 2019 · In 2020, TI reported almost USD$10. Did anyone here buy them? If so, have you been able to measure them (noise and distortion) to verify that they are real and not fake? 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. Jan 6, 2020 · TPA6120A2 is almost perfect candidate apart from one thing - stability. Dec 10, 2015 · Same pinout ordering as the SMD OP1622 except expanded to a 10 pin, 300 mil, Dual Inline Package. FBUltra Under development, composite OPA1612 and LM3886 design. Dec 11, 2019 · Normally you'd regularily search in the manufacturers new product listings first for any new interesting products. Heard it all here with different LS and poweramps. Jan 6, 2020 · Topping L30, as evident from the "L30" silkscreen. Here is my USB DAC and Headphone amplifier I've been working on it utilizes the XHRA-2HPA XMOS USB to I2S converter, a PCM1794A DAC and a OPA1622 output amplifier. It involves a balanced input stage/buffer using an OPA1632 (IC1) in a conventional topology (see datasheet ), possibly contributing some gain. 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 Apr 6, 2016 · It is absolutly sufficient for my 32ohm headphones. Although specifications of OPA1612 (bipolar) indicate they are superior to that of OPA1642 (JFET inputs) in practice OPA1642 performs slightly better. Rename the file to OPA891. At this point the temp gain over ambient with no signal is about 27 deg c. txt, but just rename it to opa1612. Apr 28, 2023 · OPA1612AID's for the AMB Audio Behinger DCX2496 are on deep backorder from Mouser and Digikey. Feb 2, 2022 · For OPA1612 in D90, the V+ pin should measure +11vdc, near to 0vac. Pins 1 and 7 are the outputs. I went through several iterations and settled on JFET buffers to raise the input impedance. 23. Its output power is slightly less than the OPA1688, and capacitive load capability is also just a tad less. If you are really lucky the other 9% will make the performance the same. Also they are very hot. OPA1612 has an open loop gain around 130dB. But I still have two AB tests going on between the two, eagerly awaiting the results. #3. I designed this to be able to drive 50ohm (HD598) to 300ohm headphones (HD650). Nov 1, 2020 · As the title suggests, it is opamp based, and is hardly unique, but it has some unusual features and has stellar specs and is pretty easy to build. #6. Feb 11, 2021 · The JFET input devices give their best noise performance at medium impedances, in the range 1 kΩ–10 kΩ. asy before using it. If I were to go ahead with replacing NE5532, I was actually thinking about OPA2132 since I heard that it imparts euphoric sound, whatever that means. The DAC is based on PCM63P-J. 5V. 1k0 has a noise output equivalent to 4. But in terms of single op-amps I have some to try - LT1028, OP27, AD845 and NE5534. OPA1656 sounded worst, Muses 8920 sounded best. Jan 19, 2023 · Buy and try several. Oh ok. 9nV/rtHz broadband voltage noise. Unfortunately, the opa2211 only comes in SO-8 Powerpad configuration. Oct 30, 2021 · 2021-10-30 1:45 pm. 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). . Is there another OPAMP that can be substituted and have the same performance. (I think that much is hard to fake. 2022-05-03 8:13 am. Balanced and single-ended outputs. 2. Try to put your finger on the opamp and see if the noise gets changed, that is a clear indication. The TI SPICE model for the OPA891 has a different pin order than most op amps: In+ In- Out V+ V-, instead of the more common In+ In- V+ V- Out. The values aren't super critical. 6) Output XLR balanced, ideally if with a big-good permalloy trafo. 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. The OPA1656 immediately raised my attention, plus there was/is a long thread about it on diyaudio. 4 mA per opamp section, which is significantly less than the 5532. TI's R&D as a percentage of total revenue in 2020 is about 10. 1nV = 6. Oct 29, 2009 · With the OPA2134 the DAC was more detailed but the sound lacked body. I'm not an engineer, i have looked into service manual and i not understand too good if IC701 has a voltage +/-16. I initially saw both the low input impedance and the signal inversion as potential drawbacks. 1nV/rtHz vs 7-8nV/rtHz) but still has a reasonable supply current of 3. If it is well implemented, non prone to oscillation, with high input impedance and within supply specs, it should work well. 1nV/root Hertz. I have idea about using diamond buffer, without anything else, as maximal purest portable headphone amplifier: - No need voltage amplification. Jul 4, 2021 · Featured Vendors The diyAudio Store Parts Connexion miniDSP DIY HiFi Supply. 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. For an old 16-bit dac, the trade off to a faster, less linear opamp may be worthwhile. pdf. 3nV/rtHz which is roughly the same as a 105r resistor. ---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. 9B (from analog). Aug 15, 2019 · I have built other phono preamps and can say without reservation, this one, especially using the OPA1612 and CDE 935 coupling capacitors, to be an excellent choice for a moving magnet cartridge phono stage. On a number scale of 1 to 5 (5 best) I ranked the following Oct 29, 2009 · 2021-07-24 7:59 pm. V- pin should be -11vdc, near 0vac. ••• Jan 8, 2023 · Joined 2010. Some features: 1. 65V in my case. 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. to pin 8 is about 16k ohm. I've used the mono opa211 SMD on a single-to-dual browndog adapter, but I need to use dual-channel SMD op amps for this project. they easily oscillate at 15MHz. It isn't TPA6120 specific. And this preamp sounds MUCH better than Audio Research, Burmester and Accuphase preamps costing above €10. 6mA. NJM4580 requires more care, usually a high-current not-too-fast FET opamp is suitable. Yesterday at 9:43 PM. I thought the effect would be somewhat less vs amps. labeelen said: 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. Resistor is cheapest way of doing it. To utilize AD8620 requires some knowledge on the circuit. BUF634A is as cheap as the TPA6120 and doesn’t need any stability care. Dec 10, 2015 · It lowers the physical output impedance yes. I have diyinhk es9038pro board and try muses8920 for i/v and LPF. I've no idea why but 1612 sample2sample is not consistent regarding H2 performance with unmatched input impedances. Point is, it depends. The 2 coupling caps are located near pin 8, so the negative supply Mar 17, 2019 · Op amp manufacturers would degenerate the input pair and so they could stabilize the op amp with a much smaller compensation capacitor, and the resulting slew rate of the op amp (determined by tail current and comp cap size) was much higher. #11. Between the power supply and the end, two 4700 F 80V parallel capacitors are Nov 17, 2017 · That crack may be a result of OPA1612 failing. Hello, guys. 3 v caps, Service manaul. Feb 8, 2022 · Also tried opa1622 which was not as good as the opa1612 or opa1656. 5 MHz LM4562, 55 MHz OPA2134, 8 MHz A 1 metre cable with polyethylene dielectric has its first resonance at 50 MHz, a 1. Keep leads to load very short, including for ground. Jun 10, 2017 · 2017-06-11 10:14 am. Given that the OPAx210 draws 2. At this point noise and ultra low noise supplies might be the last area I should put more effort into for this interface. May 19, 2017 · Joined 2006. Jan 19, 2022 · Can I use lm4766 tda7293 lm1875? Can the lm318 be replaced by opa1612, a modern low distortion amplifier? Can you recommend a circuit that can work normally? I don't want to use the recommended circuit in the manual, because I've done it. #1. It has a modest power consumption at typically 1. There is only 2 large capacitors in the power supply 1 x 1000uf 16, and 1 x 2200uf 16v, and 4 x 100uf capacitors of various values and about 4 x 47uf 6. It is current feedback operational amplifier and its stability is not so easy to tame. I am trialing this method of coupling with 4mm threaded rod, 4 mm bolts and hex rod coupler (coupling nut). Full Range. When watching dc voltage change across the 10k resistor from in+ to gnd, it varies only a few hundredths of a mv. 1nV/root Hz at 1kHz with a 10Hz 1/f corner and will cheerfully drive 600 ohms. I've tried everything or nearly so, and these are the absolute best sounding (voltage feedback) opamps for audio, for my hearing: LT1028, OPA132UA, LME49723, LME49720HA. What's not to like with that, and all the other SoundPlus family? Craig ••• Jan 6, 2020 · 2021-03-03 6:42 pm. Attached is a symbol that should work with the TI OPA891 SPICE model. A slightly special mention to the OPA211 too, which isn't bad. A lot of OPs have roughly the same open loop gain. May 3, 2022 · Joined 2022. If you added a 105r resistor into the feedback, then you would roughly double (+3dB) the output noise of the opamp. Aug 13, 2021 · Member. The OPA1611 (single) and OPA1612 (dual) bipolar-input operational amplifiers achieve very low 1. 6 fa/rtHz broadband current noise. 5nV/rtHz. TPA6120A2 is current-feedback amplifier. Apr 22, 2024 · 2024-04-23 12:47 am. Jun 16, 2022 · OPA1612 bipolar input with current noise of 3 pA/√Hz creates (according to Ohm`s law) noise voltage (3 pA/√Hz) x (63 kOhms) = 189 nV/√Hz. Strange but found too many times to ignore it. Jan 24, 2020 · The modules will feature dual PCM1794A DACs in monaural mode and have specifications identical to my company's PecanPi DAC. 9038 recomendation is OPA1612, OPA1656, OPA1688 and OPA1622. Feb 17, 2023 · 2023-02-17 3:11 pm. It mates with a standard 10 pin DIP socket like this one. 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. asy file. - No need potenciometr (DX90 have precise digital Aug 23, 2018 · I have on me LME49860 and OPA1642. Harmonic distortion <0. Aug 15, 2014 · it will say opa1612. Jan 16, 2017 · For the servo you would replace the 47uf cap with either a 0. Be sure to include the AD746, the OPA2209, and the ADA4898-2 (mounted on SOIC-to-DIP adapters) in your rotation. #5. So DACs do benefit from better op-amps. 2x OPA1641 or similar or OPA1656/OPA1642 for MM. Sound is very good, especialy a voice but sometimes I hear a little distortions. Last edited: 2023-12-08 8:51 am. Nov 11, 2019 · The ESS opamp design is what I recommend. High attention must be paid to minimize stray capacitances at PCB. D. Dec 10, 2015 · More power to you! Some tips: 1. For +/-16. Feb 11, 2021 · i will second the notion of the opa1612 being audibly superior to the ne5532 its a huge difference my daughter who patiently sat through almost 2 hours o bling listening tests on 3 upgraded cd players a nad 546bee with foil film coupling caps and 50 volt 100uf muse bipolar and wima fkp3 . Compare with typical noise voltage 5 nV/√Hz of lownoise jfet input opamp and typical 1 nV/√Hz of lownoise jfets like LSK389, JFE2140, JFE150 etc. Jan 5, 2020 · I decided to give an OPA1612 + 2 x BUF634A (per channel, a total of four) composite a shot for the ES9038PRO I/V. I'm using the OPA1612 dual opamp in a commercial design. 10k has ~ sqrt (10k/1k) * 4. Impedance plots attached below. 2x LT1115/AD797/OPA1611 or OPA1612 for MC. com with a TI insider involved. Home. Oct 19, 2013 · Joined 2015. 8 bucks Jun 5, 2023 · It is maybe only expensive for private persons like many other parts. For best performance I would suggest your PCBs just pinout the device directly. 5v or just +16. I like the low noise aspect of it, though it's pretty expensive. And of course the OPA1612. Nov 2, 2010 · 2010-11-03 11:12 am. the best sounding is OPA1612 ,not for driving headphones -low output current drive ,3ma current consumption. Apr 7, 2019 · For modern dac's you don't need so much higher speed, opa1611 oe opa1612 is probably the best option, for old dac in NOS or even classic oversampling but still noisy output i have to agree that faster op-amps are better. 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. I disagree. DX90 signal path is ES9018K2M -> OPA1602 (I/V) -> OPA1611 (LPF) -> Line Out (over capacitors). The power supply coupling is close to the opamp but not the best practice. Members Market Swap Meet Group Buys. 1-nV/√ Hz noise density with an ultralow distortion of 0. If it is still about 130ohms then OPA1612 is faulty. See pic. Apr 16, 2021 · Did anyone here buy OPA1612 from Adeleparts2010? (See attached image. Nov 22, 2021 · Older dacs with more clock noise on the analog outputs may benefit from using faster, somewhat less linear opamps. #2,487. But there is ballast resistor outside the feedback loop. Regarding the Linear Technology duals, I believe the LT1358 and the LT1469 could be considered the best overall, with the possible addition of the LT1124 that I have yet to try. 3. First was OPA1611 and they measure (with a 60 dB LNA) like a genuine OPA1611. I choose amb alpha24 with opams OPA1612, OPA1632, fully-differential outputs. 2023-01-08 8:31 am. 2017-06-04 7:42 pm. 5Vrms signal, 80-kHz measurement bandwidth. ) As per the attached image over 3000 have been sold. 9B in revenue from analog, with an operating profit of $4. Jul 5, 2006 · Featured Vendors The diyAudio Store Parts Connexion miniDSP DIY HiFi Supply. Connecting the ground pin to the negative supply will degrade the PSRR a bit. Rated power: 250W 8 Ω 1% THD, 400W 4 Ω 1% THD. 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 LT1358 can sound excellent, more enjoyable and with a better transient response than the LM4562, give it a try Mar 17, 2019 · TI's SoundPlus opamp family are astonishingly superb designs. 47uf). I have an Ortofon 2M black cartridge. Feb 4, 2014 · 2014-03-03 6:49 pm. Of the op amps in my collection the massive misbehavers are the OPA1656, the LME49990 and the OPA1612. 3V and support up to 24/192. It does need a clean reference voltage for the opamp input (only one opamp needed for Ian's dac). 5 metre cable at 33. i tryed lme49722 opa2134 and opa1612 , --. Compared to more popular VFA inverting input can't be connected directly output when used as a non inverting buffer. I have only purchased from TEVATRONIX twice. Texas Instruments OPA1612 Series Audio Amplifiers are available at Mouser Electronics. OK for my tiny sub project I am trialing 2 8 inch opposing SB Acoustics subs. The OPA2604 and AD823 are both good too, how good are you at soldering SMDs? Oct 29, 2009 · With the OPA2134 the DAC was more detailed but the sound lacked body. 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. Jun 26, 2023 · My circuit has the expected OPA1612 at the front end, with a CFA in-loop. This has been my experience with all DS/Hybrid DAC structures. Voltage conversion for the PCM2707 and PCM1794 will be done by two LP5907 Dec 10, 2015 · Do you have a microscope? Actually, the OPA1612 and OPA1688 are available in SO-8, not bad. If you are trying to map the pinout to the standard 8-pin dual op amp pinout there will be some degradation in performance. LT1057 (very refined sound, my personal favorite in combination with Beyer T90) 2. Couple items I'm not really 100% sure on and would like some feedback: Sep 14, 2022 · Final modules: 2 Hypex UcD400OEM V7. alongside with some aliexpress el`cheapos for like 2 buck a piece instead of 7. Aug 24, 2012 · Member. With 150R resistor, the voltage drop is 10. Not sure what you meant OPA1612 has very high open loop gain. #2. Dec 11, 2019 · It's a killer OpAmp, and better suited to non-inverting buffer duties than the OPA1612/2211. Mar 17, 2019 · That seemed like a reasonable target for the supply current of the OPA1656 as well. The OPA2228 didn't sound good in the DAC, and was the least good in the op-amp gain stage. Cant see anything peculiar about it. 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. And it cost so little money to build. Feb 25, 2011 · Taking a piece of gear that has been optimised for the opamps the designer selected is virtually guaranteed to perform less well with 90% of the alternative opamps you might select as possible. Gain stage combined with LPF 50-80kHz, OPA1612 probably composite but not necessary yet. Apart from that TI recommends at least 10 ohms of series output resistance. 2013-06-30 1:38 pm. Use a simple resistor, or a J-fet with the IDSS trimmed to 3mA~5mA. Which OPAMP in DAC for Dec 12, 2019 · While I could use the opa1612 for this, I would rather use the better opa2211. #2 OPA1612 - T4, D4, B5; None of the 3 new opamps sounded as good to me . R143 and R144 would be raised to 330k (for the 1uf) or 820k (for the 0. 022uf film foil were only caps in audio path she picked Nov 25, 2018 · The Aune X1s dac uses 2 NE5532 for I/V converter and 1 NE5532 for LPF/buffer and I want to change the NE5532s to newer and better opamps. May 6, 2022 · In my experience, the lower the noise the more 'air' in the soundstage so I would recommend OPA1642 its noise is way lower than OPA2604. The timbre is too ordinary. As can be seen from the diagram each opamp has a noninverting (+) inputs, and an inverting (-) input. Oct 29, 2009 · 2009-10-29 8:16 am. On the little daughter card, each supply has two 0805, X7R, 100V bypass capacitor: 100nF and 22nF. Also good choice is Khozmo preamps with z-foil resistor. The longer the time constant, the more the servo will filter LF audio and so maintain performance as frequency falls. May 8, 2011 · I came up with the attached schematic (general building block, single channel). 5v. Full schematic of this portion is attached. 15ppm, intermodulation way below that, 1. The plan is to build the amplifier stage directly as described by TI in their reference design tidu672c. On the flip side, it has substantially lower input voltage noise than the OPA1688 (1. The slew rate is higher than for the 5532, at 13 V/μs against 9 V/μs. asy and replace the old . Feb 7, 2018 · The ES9028Q2M can put 7mA out, the bias current of the common gate should be around 70mA. It's a killer OpAmp, and better suited to non-inverting buffer duties than the OPA1612/2211 Dec 8, 2023 · All diyAudio rules about conduct apply and will be enforced. At a gain of 60dB, the THAT is only down to -82dB. IMHO the outcome was mostly decided by how the opamps responded to the RF coming out of the dac chip. The completely docile op amps are the OPA2604, the OPA627, the OPA2107, the LM4562/LME49720 and the OPA2134. 000. For the way that I arrived at the following evaluations, please refer to my previous two posts, #4603 (located here: The diyAudio First Watt M2x) and #4727 (located here: The diyAudio First Watt M2x ). This is why older high speed op amps and amplifiers targeting video applications have fairly high MarkAudio MAOP11 + SDDBH-T13. 01% distortion. Joined 2011. Feb 17, 2023 · 2023-02-17 5:21 am. It is using the same chips as the Soncoz SGD1 ) I own the Gustard X16 to compare with. 2015-04-01 10:38 am. Feb 11, 2021 · My preamp sounds best with OPA1612 for gain and OPA2192 as buffer. Low noise opamps need to be used with low noise surrounding circuits though so just rolling in a lower noise opamp won't always produce improvement. 8″ SB23MFCL45-4 / Polypropylene - Sbacoustics. abraxalito said: I'd not use a JFET input opamp (OPA1642 is an example) to replace a BJT input opamp (NJM4580 is an example). Mar 16, 2017 · It is dilemma what is best choice: TVC transformers or resistive preamp. hj pn xo xo cx vj fk py yw qs