This post was originally published at synthtopia.com
Erica Synths let us know that their Black VCO & Black VCO Expander modules for Eurorack modular synthesizers are now available.
The Erica Black VCO is an analog VCO with four simultaneous waveform outputs and one octave down suboscillator.
The core of the VCO is borrowed from Russian Polivoks synthesizer VCO and uses the original matched transistor IC that was used in Polivoks. The Black VCO transistor-based suboscillator is designed to generate a distinct, rounded squarewave.