This circuit creates two percussive noise voices, it acts as noise source, VCA and envelope generator all in one.
This module is compatable 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 arraya> is available
There are three different sets of software 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. This MP3 demonstrates the sound of the Dual Decaying Noise software. At the start of the demo, it's in logarithmic/closed mode, then I do linear/closed, then linear/open, then log/open.
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. This MP3 demonstrates the Dual Delaying Noise. The two outputs are being triggered simultaneously in this demo and each is being processed by a different bandpass filter to help give separation.
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. Here's an mp3 demo of me turning knobs and flipping switches. The triggers are coming from my Clock/Divider in random mode, and the outputs are just going into a mixer. And here's a youtube demo of this firmware.
For complete descriptions of the way the module is used, and how to build it, including schematics and parts list; download this PDF file.
Boards are available now. Price for 1 PCB/PIC is $16.
Unfinished eurorack
panels are available for this project, they are 6HP and cost $8 each.
There is
more information here about panels. If you're interested in drilling your own panel for
this project, feel free to use my
drill guide. That image should be printed at 300dpi for proper
scaling.
