Unity-gain mixer with four capacitively (AC) coupled inputs and a single output - although you can feed it pretty much any signal you like (within reason; the op-amp doesn't go rail to rail so +/-10V is a sensible limit) although because the capacitors on the inputs will remove any DC offset it is really intended for audio signals where any DC offset might lead to issues when the signal is amplified (eg. clipping) - use it with attenuators and/or amplifiers to get interesting sonic effects.
It's more useful than you think ...
This board requires 0805 surface-mount components and SOIC ICs - as such it's not really suitable as an absolute beginner's project, but if you've got soldering experience, a decent temperature controlled iron and a steady hand then this won't be a difficult build providing you take your time.
Once built, the board will fit nicely behind a 4HP (20mm) panel and will be approximately 15mm deep before a power-connector is added. Board size is 79mm x 16mm.
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