This module is a variation on the 1973 Classic Serge R6 Ring Modulator. The RING MODULATOR is an AC or DC coupled Ring Modulator featuring superior audio processing capabilities. The Ring Modulator offers two VC inputs in addition to the two signal inputs which may be used to perform voltage controlled transitions between full ring modulation and amplitude modulation.

http://www.elby-designs.com/contents/en-us/p864_ES79_-_Ring_Modulator_-_GATE_VCA.html

• ? mA +12V
• ? mA -12V
• ? mA 5V

Available as an assembled Module and as a DIY project.

No info about availability.