Inspired by gtr2's build at madbean's forum,
I decided to try my own hand at crafting a circuit for the BTDR-2 reverb module. This is essentially the smaller version of the big Belton Brick. Quite a bit smaller, actually. I believe gtr2 is working on a 1590A layout for all you masochists.
I plan to do one that will fit in a 125B or 1590B. Board-mounted pots. Two controls: Reverb Level and Damper (high cut).
The module is available in Short, Medium, and Long decay times. I'm currently working with Medium, but I also have a Long module (haha!) that I will test as well. Medium sounds very hall-ish. I think Short would be more like spring.
Anyway, what I've got working now is simple and sounds quite nice. It's approximately 20 passives and a quad op amp. It could be scaled down to a JFET and a dual op amp, but the space savings wouldn't really be that great, and the JFET (buffer) would require additional passives to bias, so it would end up being more complex. Plus VREF wouldn't be buffered, and that might introduce noise. So quad it is!
Here's a shot of it from last night's first test run:
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