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bertus
Moderator
Hello,
Perhaps you can find some here:
https://www.ti.com/amplifier-circuit/op-amps/audio/overview.html
Bertus
Perhaps you can find some here:
https://www.ti.com/amplifier-circuit/op-amps/audio/overview.html
Bertus
I have auditioned many op amps over the years for use in audio. Among the best are the OPA604 and the OP37. More recently I have use NE5534's in my guitar amps. Be careful if using these as they are stable only for gains of greater than 3. Another low distortion, low noise op amp is the LT1028. I have never tried them as they are horrendously expensive. I have the largely given up on the TL071's as they are just a bit to noisy.
Another that has recently come to my attention is the LM4562 which has vanishingly small distortion figures and very low noise and was designed specifically for audio. I haven't tried them yet but intend to do so in some active speakers that I am building.
Alternatively you can build your own using discrete components which is what I did for an RIAA compensated pre-amp for my record deck.
Another that has recently come to my attention is the LM4562 which has vanishingly small distortion figures and very low noise and was designed specifically for audio. I haven't tried them yet but intend to do so in some active speakers that I am building.
Alternatively you can build your own using discrete components which is what I did for an RIAA compensated pre-amp for my record deck.
Cheers everybody. Just what I wanted to know. I finished working with electronic design way back in 1978, when I went on to do other things. Now well into my dotage and being funded by my (albeit small! Weep for me. Lol!) retirement pension, I have several projects to follow up. I feel a bit out of the loop as far as present day standards are concerned.
Industry standards in my day were TL 07/8Xs, BC108, BFY51, 2N3055 and close companions. Amazing that not too much seems to have changed. And how long had they been around then!?
Particularly like bertus' reference.
Industry standards in my day were TL 07/8Xs, BC108, BFY51, 2N3055 and close companions. Amazing that not too much seems to have changed. And how long had they been around then!?
Particularly like bertus' reference.
I cannot hear the second harmonic of 12kHz or the third harmonic of 8kHz then I probably would not try making an audio circuit with the 55MHz (!) LM4562 because it would probably oscillate. It costs almost $3.00 US.
The LM4562 has a rated distortion of only 0.00003% when its gain is 1 like a piece of wire. I can barely hear distortion that is 300 times more which might happen if it is a mic preamp with a gain of 300.
The distortion from a power amplifier will probably be much higher than the tiny amount from an audio opamp.
The LM4562 has a rated distortion of only 0.00003% when its gain is 1 like a piece of wire. I can barely hear distortion that is 300 times more which might happen if it is a mic preamp with a gain of 300.
The distortion from a power amplifier will probably be much higher than the tiny amount from an audio opamp.
bertus
Moderator
Hello,
You might also want to have a look at this eBook:
https://www.ti.com/lit/SLYY209
(An Engineer's Guide to Designing with Precision Amplifiers)
Bertus
You might also want to have a look at this eBook:
https://www.ti.com/lit/SLYY209
(An Engineer's Guide to Designing with Precision Amplifiers)
Bertus
bertus
Moderator
Hello,
Here is a page with a list of 2017 for "good" opamps:
https://www.cycfi.com/projects/six-pack/op-amp-shootout/
Bertus
Here is a page with a list of 2017 for "good" opamps:
https://www.cycfi.com/projects/six-pack/op-amp-shootout/
Bertus
I have a 12 string acoustic guitar. There are times I desire to amplify its sound. I have tried 3 styles of 'snap on' pick-ups but all were unsatisfactory. I have resigned myself to the idea that a microphone and mic amplifier may be my only salvation. I tried a mic from a 70s brick-type walkie talkie but it didn't seem to pick up sound from and distance beyond a couple inches. Makes sense, I guess. Undoubtedly I could go to the local music store and get a decent (sic?) mic and amp for $1k. I'm looking more in the $20 range. I had a karaoke mic but must have thrown it out. Any suggestions as to coming in on budget? I have a 60W Pyle guitar amp which works fine for my $30 thrift store electric but does not have a mic input. I believe a little pre-amp I designed will solve that problem, but it would be nice to have a stand-alone unit. Cannibalizing and salvaging are my current landscape.
