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Electronic Modules

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Rob, NE5532 is really a good OPAMP compared to many others. I have a pre-amplifier built using NE5532 with excellent performance outweighing most high end pre-amplifiers.
NE5532 incoporates BJT circuitry inside, but if u wish to go something with FET circuits inside AD825 is the best choice.
Please consult other diy hobbyist, may be they can give u better options.
try the analog devices OP275 too - it's not very glamorous but it is a solid device that sounds pretty good in many common applications, and it's pretty cheap too. if you want to go really high performance, AD825 is good, or maybe burr-brown OPA627, but those are single designs - if you need a dual opamp your choices are a bit more limited.
Another way to get a high performance dual is to put a pair of AD825 or surface mount OPA627 on mini-dip carrier. There is a company (LC Audio in Germany? I think) that does this for the AD825 already.
I can only echo the praise for the BB OPA2604. It tends to have a warm sound which I like.
I don't think that a lot of people over here will agree, but I prefer high slew-rate opamps with a large open-loop bandwidth (> 10Khz), such as the AD826. Why?

- The high slew-rate (350V/us) enables them to cope with very fast signals. Also a good choise for a DAC I/V.
- The slightly higher noise figures (18nV/Hz) do not affect the results too much. Resistors contribute more to noise figures than the opamp.
- The open-loop bandwidth reduces the need for NFB, as well as the distortion figures in the higher audio bandwidth.

the OPA2604 is one of the very best, but i like the OPA2134 even more.
Preamp tone control
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