1->4 buffered multiple PCB for Eurorack systems
Utility modules FTW - you can never have enough multiples.
This is a simple 1-to-4 buffered multiple for distributing either audio or control voltage signals - 1 input, 4 outputs and no fuss. Multiples are like VCAs - you can never have enough of them; sometimes you want to take a signal and route it to multiple modules. Sure, you can do that with a passive mult but if you're flinging control voltages around, particularly to sequencers, then an active buffer is hard to beat - here we've got a single input being sent to four buffered outputs; there's nothing fancy here, just four op-amps set up as voltage followers - no mess, no fuss.
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.
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