Simple tile-based signal booster ... or attenuator.
Ideal for use with Arduino or other MCU-based modules which tend to be a bit 'quiet' because of limits on how much current the MCU is able to supply. If configured as an amplifier, this will have a maximum gain of 100 which will give you everything from 'a little bit more oomph' to 'clipped to hell and back'. Alternatively, if you prefer it configured as an attenuator it will range between zero and unity gain.
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 panel if you're that way inclined.
NOTE: these boards have a HASL (Hot Air Surface Level) finish which is 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