Love it when the DIY community turns a classic obsolete.Yep, the pot gives you much more control on the sweep than the 3 positions of the switch.
The chaps at Fuzzdog came up with this, schematic here.
In my build and also my original (a november 2022 GC special recipe) there is a slight pop when flicking the gain switch indeed.Interesting, this circuit is great! I'm curious, how are you handling switch pop and volume difference when the gain footswitch is engaged?
There's DC voltage across that switch because it's switching the voltage reference. I've built a couple of these (for personal use) and always dismissed using a footswitch for these reasons.
Didn’t you make a post about this before? I couldn’t find it. Was this something you cook up? Or was this something you got from OSH park?Cabintech CT3680 Digital BBD beta test box:
View attachment 81937
Stereo chorus and delay with variable soundstage width. 4 taps with individually variable times and mixes.
I've mentioned it in a few places, mostly in the Cabintech thread. There are about half a dozen of my various utility boards in there: mixers, gain stages, and a 9V to 5V regulator. And then I used a cheap eBay sourced XR2206 sig generator board for modulation.Didn’t you make a post about this before? I couldn’t find it. Was this something you cook up? Or was this something you got from OSH park?
Ok at first I thought you used the dev board, but is sounded like you did something different, I forgot about the Cabintech thread.I've mentioned it in a few places, mostly in the Cabintech thread. There are about half a dozen of my various utility boards in there: mixers, gain stages, and a 9V to 5V regulator. And then I used a cheap eBay sourced XR2206 sig generator board for modulation.
The OSH sticker is just covering up an unused hole or two while I work out the final control set. From there I plan to consolidate some of the sub modules into a more practical two or three board format, and look at hopefully fitting it all into a 1590BB case. I'll post a schematic and probably the PCB Gerbers eventually, but Cabintech have added some new features since the two revisions they sent me for beta testing, and I want to look at which additional ones to incorporate, or not. I'm also contemplating adding some EQ in the feedback circuit to emulate the classic BBD analog delay vibe. It's sounds really nice right now though, and I could easily just call it good at any point.
This build uses the first rev development board, but with custom firmware for the stereo soundstage that I flashed myself via the Cabintech remote app. They also sent me a second gen dev board with a slightly different stereo program, which I haven't touched yet. So I'm trying to decide what to do with that one, because it seems more sensible to just move on to the production version if I'm going to put in all the time to do my own control board layouts, revisions of those. etc. But I tend to prefer modular builds for R&D stuff, and will probably just use the rev2 dev board for something quick and easy like a simple reverb or a flanger. That huge enclosure was someone else's junkbox part that he threw in on a big package deal, it's been mighty handy for beta testing the CT board.Ok at first I thought you used the dev board, but is sounded like you did something different, I forgot about the Cabintech thread.![]()
I half wonder if the ct3680 would be a reasonable adaptation to a DC-2 type circuit with a width control, how’s the module sound in comparison to say a fv-1 based modulation circuit? Are they comparable? The cost seems quite a bit more.This build uses the first rev development board, but with custom firmware for the stereo soundstage that I flashed myself via the Cabintech remote app. They also sent me a second gen dev board with a slightly different stereo program, which I haven't touched yet. So I'm trying to decide what to do with that one, because it seems more sensible to just move on to the production version if I'm going to put in all the time to do my own control board layouts, revisions of those. etc. But I tend to prefer modular builds for R&D stuff, and will probably just use the rev2 dev board for something quick and easy like a simple reverb or a flanger. That huge enclosure was someone else's junkbox part that he threw in on a big package deal, it's been mighty handy for beta testing the CT board.
We both know that with a build like that, what you posted was not a proper gut shotObligatory gut shot.