The bare PCB for my old OptoThing v2.0 Eurorack module - ideal for those who want to source their own components and fab their own panels.
Amazing what you can do with a bunch of resistors and an optocoupler - this is a revamped version of the old OptoThing which uses (mostly) surface mount components, meaning it's a little bit cheaper. I have, however, kept the Sharp PC817 optocouplers since I wasn't really happy with the response of the SMD Toshiba optos that I was trying.
Surprisingly versatile - a control voltage is used to trigger an optocoupler which sits between the input and output signals. So far, so boring. However, this is not your typical Vactrol-type application: by fiddling with the potentiometer you can limit the current passing through the optocoupler (think in terms of a current-limiting resistor on a 'regular' LED) which can have quite a profound effect on the final sound - it can be used as a low-pass gate, a resonant quasi-filter or a ghetto-style VCA (the original intended use).
Inputs are DC coupled, although since this module is passive you may wish to buffer any control voltages if you're using the output to drive a VCO or similar.
100% through-hole construction - no surface mount parts or wilfully weird/rare components, low parts count and completely passive. It's a simple module but will do interesting things to your sound.
How you actually mount the board is entirely up to you, although it is designed to fit behind a 4HP (20mm) wide panel with the board parallel to the panel. The board itself measures approximately 78mm x 16mm
By buying this PCB, it is assumed that you know what you're doing and are able to source appropriate componentry. The board has a HASL finish so is not lead-free - as long as you exercise common sense and don't go licking the solder pads you'll be good.
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I've been a musician for a while now - up until quite recently my weapon of choice was a bass guitar, but having fallen down the rabbit hole that is modular synthesis I have a new way to make noise ...
I started out the usual way: buy a rack and a bunch of modules (ADSR, VCA, VCO, that kind of thing) and start making noises. Then I discovered the DIY scene and it all snowballed from there - sequencers, filters, logic modules ... four racks full of noisemakers later and I'm still not done.
I'm a big believer in the KISS principle - Keep It Simple, Stupid! If you want all-singing, all-dancing multifunction modules then this really isn't the place for you - I prefer to build modules to do one thing and (hopefully) do it well. This is a rule I follow when I develop software, and hardware is no different.
The stuff you'll find here will generally be 'excess' from a run of boards - the underlying designs will have been tested and known to work, all you need to do is source appropriate componentry and do a build. I'm not going to make any claims that I'm the world's best circuit designer, but hey, if it ain't broke ...
For the really curious, despite working as a software developer I do have a PhD in theoretical physics, specifically the numerical simulation of explosions. It isn't nearly as interesting as you might imagine :-p