Friday, 26 October 2012

update from post on 28/4/2012:
 A utility PCB, no pots, just jacks. Moog fixed filters - brass, vibes, humana, funk, harpsichord another fixed parallel BP voice filter (called gargle).
 These can of course be used with any audio or noise source but are intended primarily as filters for the extra outputs on the Veena.

 Also has white noise, pink noise, random vibrato, slow random, chunder (roar), two difference rectifiers and a 4046 phase locked loop circuit.

 Somewhat pleased to find everything worked very nicely. I tweaked a couple of resistor values to get the white noise level off the rails and get the LED brighter and flashing more often. Otherwise it is fine.

One nice feature is to daisy chain the filters to get new sounds.
The 4046 PLL was a bit of a gamble but it sounds great, adds a bit of distortion and spits, screams and fizzes as it tries to track the incoming signal. I built the proto-type with nearly all ceramic caps, figuring that will be the worst it can sound, but it actually sounds good. the original Moog passive filters, that these are based on, were likely built with ceramics anyway.

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