Hello.
I'm looking at the circuit for the Peavey CSR2 compressor pedal. Many compressor pedals have a Mystery Box in the schematic, representing maybe a transconductance amplifier or the like. But the CSR2 has two Mystery Boxes, and that's intriguing.
They appear to have only factory numbers on the drawing which is even more mysterious. I suppose that one is a transconductance amplifier because they turn up so often. But what is the other one?
Question about CSR2 Pedal Circuit
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- New Member
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- Joined: Fri Feb 10, 2017 9:37 am
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- New Member
- Posts: 2
- Joined: Fri Feb 10, 2017 9:37 am
Re: Question about CSR2 Pedal Circuit
I think I've got it. The chip is one of the ancient 570 series compander, originally invented to reduce noise in transmission and recording chains. It's a two-channel chip. The first box, one side of the 572 in the feedback loop of an op amp, composes a compressor. The second box, the other side, composes an expander.
I don't know how the ingredients are prestidigitated to make the pedal do what it does, but there it is.
I don't know how the ingredients are prestidigitated to make the pedal do what it does, but there it is.