CGS97 - Serge Noise Source | Cat Girl Synth

The Serge noise module can be built in several ways. In it's simplest form, it contains three basic outputs, White noise, Pink noise, and a random voltage suitable for use with Sample and Hold modules. An optional Sample and Hold circuit is included on the PCB. Alternatively, the basic version may be coupled with the CGS92 Serge Smooth and Stepped Generator to make the Random Voltage Generator module.

It will work on either +/- 12 volts, or +/-15 volts by installing on-board regulators.

A little on how it works:

The schematic for the noise source. The upper part of the diagram shows the noise source, while the lower part shows the optional Sample and Hold. T1 at the upper left is a transistor selected for its noise characteristics. Below it is an NPN transistor shown in the orientation in which it could be used to substitute for the PNP. As only the base-emitter is used, either type of transistor will work in the circuit.