Amazing what you can do with a bunch of resistors and an optocoupler.
Surprisingly versatile - a control voltage is used to trigger an optocoupler which sits between the input and output signals. So far, so boring. However, this is not your typical Vactrol-type application: by fiddling with the potentiometer you can limit the current passing through the optocoupler (think in terms of a current-limiting resistor on a 'regular' LED) which can have quite a profound effect on the final sound - it can be used as a low-pass gate, a resonant quasi-filter or a ghetto-style VCA (the original intended use).
Any 4-pin optocoupler can be used - I'm a fan of the Sharp PC817. Alternatively, with a bit of care you can use the 'ghetto Vactrol' LED/LDR combo.
Inputs are DC coupled, although since this module is passive you may wish to buffer any control voltages if you're using the output to drive a VCO or similar.
The board is 15mm wide so will fit nicely behind a 4HP panel.
|Shipping Rate||First item||Additional items|
Royal Mail: International Tracked and Signed
International Tracked and Signed service - signature required on receipt. Shipping generally takes 5-7 days depending on customs etc.
We recognize our top users by making them a Tindarian. Tindarians have access to secret & unreleased features.
We look for the most active & best members of the Tindie community, and invite them to join. There isn't a selection process or form to fill out. The only way to become a Tindarian is by being a nice & active member of the Tindie community!
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