3-way diode OR tile for 1U Eurorack systems
One of the simplest modules out there - if a signal is presented at any of the inputs then it'll appear at the output as well; very useful for generating interesting patterns from clock signals or triggering a module from multiple sources. Personally, I wouldn't be without a couple of these in my percussion system.
This tiny board (approximately 27mm square) is designed to fit behind a 1U tile - alternatively, you could mount two or three of them behind a standard 3U, 6HP tile for a full-sized module. The module is fully passive, so no power is required, although you may find it beneficial to buffer control voltages before passing them through - in addition, your input signal will lose approximately ~0.6V because of the diodes.
Simple, surface-mount construction with a very low parts count - the BOM is:
The boards have a HASL finish so are not lead-free.
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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