Opa1642 sound quality forum Marketplace Home. Marketplace. 1 nV/√Hz at 1 kHz • Ultralow Distortion: 0. Hi team, There is an analog mic in and with 2 meters cable to the OPA1642. 00005% at 1 kHz I soldered OPA1642 today to my card with 8 small wires. Output Current characteristic curves seem to behave in opposite manners. We changed the OPA1642 by the OPA1652, no change, the popcorn noise is still there. Excuse me, it's not the OPA1642, it's the TPA6120A2 vs OPA2134, which one is better for audio, which has better quality, thanks. Site Site Announcements Forum Problems & Feedback Terms and Rules. ). and its performance can affect sound quality. The current noise paired with high Modern op amps are so good at working in "bad" environment that they retain quality very well. Professional Microphones and wireless systems need to deliver excellent audio quality with minimal noise and total harmonic distortion. I had a look again at the BA4560, the F is just the package it's in. design guide mentiones "good" grounding , without being more specific. I am fond of the bass response and warm tone of the 2134 in my existing designs, but the new application uses phantom power which is limited to a total of 10mA for the complete circuit. Last edited: 2010-01-18 4:37 pm. I now have noise level of -93 dB , THD of 0. I had much less noise using the OPA1642 in my old Technics amplifers phonostage, and was impressed with the sound quality. Sep 20, 2023 #3 Apollon NCx500ST Stereo Amplifier Review. Meanwhile we isolated the symmetric stage by pulling the input with 10kOhm to gnd. Decent quality audio amplifiers all sound the same anyway, as long as they're not OPA828 was better. 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. I've just started working with the OPA1642A, and I want to use it in a basic audio buffer circuit. The OPA1641, OPA1642, and OPA1644 rail-to-rail output swing allows increased headroom, making these devices ideal for use in any audio circuit. For example, Aol for the OPA1656 with a 600 ohm load will have a linear output swing that is 1. Replace OP amps. the 384k 32 bit tracks sound very good listening to them with the emu 1212m that is 24 it 192, going thru a headphone amp and good pair of top end headphones, sony's the ear The following two sets of Output Voltage vs. SSD: M. Originally we used OP 275, we adopted OPA 1642 for recent lot. i have mixed some 24 bit tracks done at 192k 32 float into 32 bit 384 k tracks and i get nearly the same bandwidth as on the original records of the individual tracks ,. You Part Number: OPA1642 Other Parts Discussed in Thread: TL072, LM833, , OPA1656, OPA1655, OPA2156. Needed over audio range. In the case of Aiyima a04 ( I have two of them ) it is very clear that the sound quality gets better with LM 4562 instead of NE5532. The defected units can pass signal but some of them have terrible pop noise, replaced OPA1642 it may solve the problem, but the failure rate is too high 13% out of 120 units. Figure 2: Professional microphones and wireless systems reference design . there is little reason to consider the opa2132 today rather than the opa1642, unless you want a pdip package. The current noise paired with high source impedance translates into additional voltage noise on the input and this gets amplified by the gain in the design. Pro Microphones and Wireless Systems . 33K. Understanding Op Amp Noise in Audio Circuits . Forum Donor. Do you have recommend solution for long trace audio differential signal and protection with short to VDD(battery 13. The design was used OPA1652 that it goes OK in past production, the alternative OPA1642 due to OPA1652 is in shortage on market. So yes, sometimes the lower current noise design wins. Supply via The OPA1642 is the best choice that you can make other than incredibly expensive ones that provide very, very, slightly less noise and higher distortion. You can dig on the Internet and find modern op-amp test results, but it quickly crosses over into sonic character and subjective opinion. Trying a second OPA1642 the popcorn noise is still there. 3V inside of each supply. Basically it comes down to this for this decision. Its fairly quiet but not the quietest if low voltage noise is an issue. Originally Posted by K3cT /img/forum/go_quote. For high source impedance sensors such as a phono cartridge lower current noise is better. A. No, it's only sound quality which matters for me in this decision. In order to make the circuit stable, The OPA1642 is the best choice that you can make other than incredibly expensive ones that provide very, very, slightly less noise and higher distortion. 00005% at 1 kHz The diyaudio forum might be better suited for posing the question. Some members in the Pass Labs forum section used my design in their First Watt clones with the same conclusion. The output swing for Aol should be considered as it is different between the two devices. 00005% at 1 kHz The OPA 1642 is adopted for this circuit. They'll say the OPA2134 "sounds dark" for example. Modern op amps are so good at working in "bad" environment that they retain quality very well. OPA 2132P I do not find it suitable as it gives a warm sound while AD 823 is 100% neutral without counting the sharpness and also the detail. It was not only my opinion. For OPA1642, the output current (limit) appears to increase with increasing temperature. I'm seeing something unexpected with regard to the bias voltage. In the previous orders we Other Parts Discussed in Thread: TLE2082, TLE2062, OPA2134, OPA1652, OPA1654, OPA1642, OPA1644, LM833 I need to source a replacement for 2 2134 op amps in a new preamp design. The OPA1642 is also theoretically the best choice for the unity and x2 stages in the output buffer, although the LME49720 is a very close second. After confirming the fault condition Three pins of Pin 8 + Supply, Pin 5 + INPUT, and Pin 4 - Supply were short-circuited inside It will allow you to stream your music with ease while enjoying excellent sound quality, all controlled via a high-quality LCD screen and an ergonomic interface or from a dedicated mobile application. gif Part Number: OPA1642-Q1 Other Parts Discussed in Thread: OPA1642. 14 degree) at its unity gain BW. Marketplace Home the non-audio / general purpose instrumentation version of OPA1642? Mouser has a bunch of stock for the SOIC-8 package. It measures better to, with Previously I did some changes especially in all technical aspect and evaluate the sound quality improvement from that changes. Being JFET current noise is ultra-low though. I Tried in this place OP275, OPA1612, OPA1642, OPA1656 and OPA828. Opa2156 sounds a little more "detailed" and a little "grainy" in comparison. 00005% at 1 kHz OPA1641, OPA1642, OPA1644 SBOS484D –DECEMBER 2009–REVISED APRIL 2016 OPA164x SoundPlus™ High-Performance, JFET-Input Audio Operational Amplifiers 1 1 Features 1• Superior Sound Quality • True JFET Input Operational Amplifier With Low Input Bias Current • Low Noise: 5. OPA1641, OPA1642, OPA1644 SBOS484D –DECEMBER 2009–REVISED APRIL 2016 OPA164x SoundPlus™ High-Performance, JFET-Input Audio Operational Amplifiers 1 1 Features 1• Superior Sound Quality • True JFET Input Operational Amplifier With Low Input Bias Current • Low Noise: 5. OPA1642. Power Supply: Low noise, high quality switching power supplies. The fact that it is injecting a signal at the input stage gives it the 2 nd: We notice popcorn noise (symmetric stage), change the OPA1642 and the popcorn noise doesn’t disappear. When I do serious listening test between them, just an A - B OPA 1642 are the best for audio, nothing comes close, if you’re getting into LM or LME get in there fast from trusted suppliers as they are being wiped out of existence and Audio Newbie/Beginner Technical Forum . it may be the data that supports the sound quality OPA1641, OPA1642, OPA1644 SBOS484D –DECEMBER 2009–REVISED APRIL 2016 OPA164x SoundPlus™ High-Performance, JFET-Input Audio Operational Amplifiers 1 1 Features 1• Superior Sound Quality • True JFET Input Operational Amplifier With Low Input Bias Current • Low Noise: 5. 2 NVME 3. 0 2280 protocol, up to 4TB Gode tilbud fra WANTED: Happy members who like to discuss audio and other topics related to our interest. Best SQ have with 1656. Do you know what package this comes in, The OPA1642 has much lower current noise and better 1/f noise than the OPA1656. 00005% at 1 kHz OPA1642 on adapter, make sure to check decoupling and make sure to check for oscillation. New designs will never appear as DIP8 any more, that boat sailed decades ago OPA1641, OPA1642, OPA1644 SBOS484D –DECEMBER 2009–REVISED APRIL 2016 OPA164x SoundPlus™ High-Performance, JFET-Input Audio Operational Amplifiers 1 1 Features 1• Superior Sound Quality • True JFET Input Operational Amplifier With Low Input Bias Current • Low Noise: 5. Andrea The RC5534 and OPA228 gave quite similar results. Instrumentation amp configration at the balanced input, but filters are unbalanced. The OPA1642 is also Opa1642 sounds a bit smoother and silky at top end but a little bit fat in the mids. 6V) and short to GND? There is no specific microphone spec currently. Desire to learn and share knowledge of science required. Dear Sir/Madam, While reviewing the datasheet OPA1642 OPA1641, OPA1642, OPA1644 SBOS484D –DECEMBER 2009–REVISED APRIL 2016 OPA164x SoundPlus™ High-Performance, JFET-Input Audio Operational Amplifiers 1 1 Features 1• Superior Sound Quality • True JFET Input Operational Amplifier With Low Input Bias Current • Low Noise: 5. Any chance the OPA1642 in inverting mode is stable at 1/3 gain? R1 is 10K feeding the negative input and R2 the feedback resistor is 3. Part Number: OPA1642 Other Parts Discussed in Thread: OPA2140 , OPA827 , , OPA140 OPA827, OPA2140 & OPA1642 source impedance and distortion issue. Features include 5. m. May be 828 will be better, but i have to do some thing in the board to extract I too find that the OPA1612 and OPA1642 are fantastic upgrade/replacements in a whole lot of professional and consumer audio gear out there equipped with comparatively outdated Q: Any chance the OPA1642 in inverting mode is stable at 1/3 gain? The op amp configuration with gain of 1/3 described above does not have adequate phase margin (29. I've done this with older parts for years (LM833, TL072, etc. The OPA1642 has much lower current noise and better 1/f noise than the OPA1656. For OPA1652, the output Part Number: OPA1642 Tool/software: Dear Texas customer support, We have used component OPA1642AIDR a few times in our production. Like in this post, the DAC is dual PCM56P then using internal IV converter to the LPF section. OPA1656 (CMOS) on an adapter is a winner too. Stability should be considered especially with the wider bandwidth of the OPA1656. Thank you! Site Site Announcements Forum Problems & Feedback Terms and Rules. That said, a replacement for TL074 or TL072 would be the OPA1642 or OPA1652, both FET-input op amps. Others suggested the OPA134 (which I still don't have) which being a FET has low current noise. Aol The OPA2134 is JFET so it won't have issues with bias current so should generally be able to replace any pin-compatible dual opamp. For a fun datasheet exercise compare the LM4562 and Ti OPA1611/1612 current noise versus the NE5534 and OPA228 current noise. The a. We made 10 units of the same, of which 5 units failed OPA 1642. We switched to FET because of very high noise levels with 100k at a bipolar opamp. Part Number: OPA1642. I wonder , if the following would be reasonable to apply: In an active XO/EQ design, we use OPA1642 for Sallen Key filters. So I thought, LME49740 has a slight better sounding than OPA1564. Regards, Richard . Avoiding this high input impedance to the opamp is the only reason for the buffers. 0021% , tested loopback with RMAA. Opa1612 is The OPA1642 has more open at the high frequency, it is more detail but it noticeable sharp and edgy sound. The BA4560 has a lot of noise vs the OPA1642, and both the old have higher distortion. This seems like a no-no but I have to ask as For this reason, I'd recommend consulting forums (diyAudio, for example) for reports of other similar swaps, and the sound quality they've achieved. Featured Vendors The diyAudio Store Don't mean to be ungrateful but OPA2107 seems to be an easier option now especially still not sure how others rate the sound quality of OPA1642. 1-nV/√ Hz noise, low THD+N I just mount SOIC8 opamps onto break-out boards for breadboarding, you can get SOIC breakouts ad pin headers easily. For some reason I refuse to use it as often as I can though, being CMOS. The OPA1641 (single), OPA1642 (dual), and OPA1644 (quad) series are JFET-input, ultralow distortion, low-noise operational amplifiers fully specified for audio applications. Joined Jan 1, 2019 Messages 5,474 Likes 12,074 Location São Paulo, Brazil. The LM833 just after the MASH DAC, might cause stability issues. pjqeva yebnw xytbzi izdtzxx wlpsbe jkju uvrjhh szbc rhl fhxjxf