This is the bare PCB for my forthcoming dual CMOS filter kit - it isn't a Eurorack module per se, although it could be made to be one with some mods to the power input, rather a little unit that you can have in front of your system and tweak to your heart's content. You can treat it as either a pair of mono filters or a single stereo filter depending on what you route and from where. Running a pair of slightly detuned VCOs through it and mixing the outputs is a good way to get a really fat bass sound.
Consider this as two copies of my 69er resonant filter on one board, because that's exactly what it is - the filter characteristics are controlled by two groups of capacitors (C2/C4 and C3/C5) so whilst 100nF capacitors are recommended, you're free to put your own values in there if you wish - the sound will alter accordingly.
These are prototype boards from OSHPark in the US - they've got a lead-free ENIG finish and measure approximately 48x75mm - the filter should be powered by a centre-positive wall-wart power supply with a 5.5mm/2.1mm connector. The input voltage depending on what sort of voltage regulator you use: for 9V operation, 12-15V is good whereas for 5V operation you should probably use 9V.
For best results, run the 4069 chip at 9V (ie. use a 7809 regulator and a 12-15V supply)
The PCB is 100% through-hole - no fiddly surface-mount components required and the components are easy to source from the usual places. A suitable power connector can be sourced from SparkFun (part PRT-00119 - https://www.sparkfun.com/products/119 )
By ordering this it is assumed that you a) know how to source your own components and b) know what you're doing when it comes to building it up. A BOM and panel fabrication files will be provided at purchase time.
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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