A friend of mine asked me for some help in improving a phono preamp on his receiver.
The problem is it uses a dual DIP chip: M5220P. It's supposed to be a low-noise chip, but it's all I know.
It's unlikely it's nothing special, so it might be interesting an upgrade to a better chip.
Being dual limits the choices somehow, so my personal favourite OPA627 unfortunately, is not an option here.
I wonder if it's good keeping the FET inputs or if the choices should be widened, including some bipolars. Once again, the bipolars I know, like the LT1028 or LT1115, are single types.
So what might be a good choice?
Carlos
The problem is it uses a dual DIP chip: M5220P. It's supposed to be a low-noise chip, but it's all I know.
It's unlikely it's nothing special, so it might be interesting an upgrade to a better chip.
Being dual limits the choices somehow, so my personal favourite OPA627 unfortunately, is not an option here.
I wonder if it's good keeping the FET inputs or if the choices should be widened, including some bipolars. Once again, the bipolars I know, like the LT1028 or LT1115, are single types.
So what might be a good choice?
Carlos
Well, with so many options to try, better put a socket first.
Can anyone tell me how you compute the gain of RIAA stage?
I say this because some chips may not be unity-gain stable, and I was just reading that at high frequencies the RIAA will eventually take gain to 1.
This layout uses a single chip, with the RIAA eq on the feedback.
Carlos
Can anyone tell me how you compute the gain of RIAA stage?
I say this because some chips may not be unity-gain stable, and I was just reading that at high frequencies the RIAA will eventually take gain to 1.
This layout uses a single chip, with the RIAA eq on the feedback.
Carlos
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