Jam Pedals Rattler V2 Design Speculation

Robert said:
The trim pot is not in the feedback loop, in fact, it doesn't appear to be in the boost circuit at all, and that's puzzling me.
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That will teach me to jump to conclusions, I was so sure it would be in the feedback loop given it's value!

Thanks for sharing your findings so far.
 
Robert said:
The trim pot is not in the feedback loop, in fact, it doesn't appear to be in the boost circuit at all, and that's puzzling me.
Click to expand...
I keep telling myself to just wait until you’ve done the PCB, but I’m curious, if the 1M trimmer is not in the op-amp feedback loop of the buffer, where is it, what is it doing?
 
Robert said:
The TL072 stages are the boost gain stage, a buffer, the clipping makeup gain stage, and a VREF buffer.

The trim pot is not in the feedback loop, in fact, it doesn't appear to be in the boost circuit at all, and that's puzzling me.

I have to trace the relay switching next to see how all of these sections tie together... I'm sure it'll all make more sense after that.

Normally I would have done that first, but since I can't easily remove the relays (there are three SMD relays in tight quarters) I'm saving that fun for last.
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@Robert, Just wondering if you can shed any light on the nature of the boost? :)
 
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