This is a shrinkified resonant filter which utilises the classic Sallen-Key topology - the capacitor values in the BOM are such that you'll get a pleasing amount of resonance with the pot turned all the way up. If you want something with a bit more bite then simply use whatever value capacitors you deem appropriate - if you use the values specified in the BOM you'll get a maximum Q of about 25 if memory serves; whilst this won't shred your face off it also means that the thing won't veer off into self-oscillation either.
If you're planning to dip your toe in the water of surface-mount soldering this is an ideal starter board - it has a low part count and doesn't require any special voodoo to get things done; I use SOIC and 0805 components myself and there's nothing remotely scary about SMD soldering if you have a steady hand.
Note, however, that unless you're planning to panel-wire things you'll need an Alpha (or equivalent) dual-gang pot to operate the filter.
A dual power-supply is required too - there's a three-way header for power connectors; the 1U tile spec calls for Futaba J connectors or similar but really you can use whatever you like provided the op-amp has both positive and negative supplies.
It's a pint-sized powerhouse - the board is just over 1 inch square, so it'll fit behind a 6HP width tile. If tiles aren't your thing then it's easy enough to mount two or three of these behind a 'regular' 6HP Eurorack panel to give yourself a nice multiple LP filter.
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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