This circuit creates two percussive noise voices, it acts as noise source, VCA and envelope generator all in one.

This module is compatible with 12V or 15V systems. It uses a 6-pin R/2R resistor array that is becoming harder to find. A larger version with a discrete version of this array is available.  BMC073 4 Knob DDN

There are three different sets of firmware offered for the DDN. When ordering let me know which set you'd like programmed into your PIC:

1.Dual Decaying Noise - 2 digital noise outputs, the knobs set the decay, and the switches select between linear and logarithmic decay curves and whether decay begins at the rising or falling edge of the input trigger/gate. 

2.Dual Delaying Noise - 2 digital noise outputs, but with software emulation of a delay effect. The knobs set the Decay time, Delay time, number of repeats and Delay level for each channel. 

3.Decaying Noise/Tones - Each output is switchable between noise and square wave. The knobs control decay times and frequencies. This lets you have a kick and a snare sound from the same module. 

Demos, build documentation, drill guide, are available here.

Unfinished panels are drilled by hand in my garage, they are bare aluminum that may be scratched.  They are intended to be painted, etched or otherwise finished later.

Pre-Assembled Modules are built after the order comes in.  Build time can be a few days or a few weeks depending on what parts I have on hand.  When ordering, please leave a comment at checkout if you have preferences on what color(s) the panel is painted.