One of those strange ideas that seemed too simple not to follow through ...
Despite being called the 'XFDR' I'm unsure as to whether or not this could be considered to be a true cross-fader. Maybe it is, maybe it isn't.
Hear it here, the Drone Monster doing it's crazy thing, fading into a more 'normal' sequence and back again.
This module consists of two channels with a pair of DC-coupled inputs and a single output (all of which have op-amp buffers) - each input has it's own level pot, whilst the output pot adjusts the 'balance' between the two sources. The net result is somewhat interesting - if you're using a pair of VCO signals you can mix them in interesting ways by altering the individual levels as well as the 'balance' between them, almost like a wave-shaper.
Similarly, control voltages can be manipulated in a similar way. Since the inputs are DC coupled, you can mix any signals together, within reason - +/-10V is a sensible limit as the TL-series op-amps don't go rail-to-rail.
Files for panel fabrication can be found here.
BOARD SIZE: 80x49mm (approx)
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