Hi guys, I have a preamp that I built where the tone control can be bypassed. The issue I have is when I switch in the tonestack (passive baxandall), the volume drop is quite dramatic. I want to put in a gain recovery after the tonestack to bring the level closer to what it is when the TS is bypassed. I put together a simple opamp gain stage as shown here (http://www.muzique.com/lab/boost.htm) on the very bottom right (resistor values changed to what I had on hand). The issue is that when I start to bring the gain up from unity, the signal starts to clip before very much gain is recovered. Up to this point in the signal path, there have only been two amplification stages and then the tonestack, so I don't think my input signal is too hot to be boosted cleanly.
My question is whether this topology looks suitable for the application and whether there are any other suggestions out there. The output of this gain recovery would go straight to volume, then power amp. Thanks.
My question is whether this topology looks suitable for the application and whether there are any other suggestions out there. The output of this gain recovery would go straight to volume, then power amp. Thanks.