Original Message -----
Subject: Re: [softrock40] Re: softrock40
Try changing R32 and R33 to 10k instead. You can leave C23 and C24 off for
testing.
By doubling the feedback resistors you are halving any OpAmp noise that
loops back into V-. If this doesn't help then I'd guess you hit a limit
due to common mode noise.
Spice says you will get an extra 6dB up to 10KHz if you leave the capacitors untouched. About 4dB down at 30KHz.
My tests suggested there was no SNR improvement.
73 Alan G4ZFQ
