UBZR1 Noise Generator Module

Chelys Lyra


The Noise module serves two purposes:

Functional Description

The noise module uses a transistor operated in reverse mode above breakdown voltage with current limited.

The following opamp circuits filter for

Final amplification is done with an LM 13700 transconductance amplifier, which serves as a built-in VCA and provides for two separate current outputs, one for white/pink noise and one for pink/red noise. The former can be used in the audio path, the latter is available in the modulation matrix.

Performance Specs

‑ to be documented ‑

Schematics as SVG Files



In UBZR1, that latter two inputs are wired together outside of the Noise module board, because outputs #0 and #1 are not likely to be used at the same time.



Last change: 2023-08-04
© 2002-2023 Dr. Thomas Redelberger

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