MSK 006 Exponential VCA

Triple discrete exponential VCA

This is a DIY VCA made with discrete transistors, 20 of them per channel, in an operational transconductance amplifier arrangement similar to the circuit inside an LM13700. It has a rarely-seen pure Class B output stage, with compensation against crossover distortion.

"Discrete" amplifiers are mostly mumbo-jumbo; to be quite frank, you get better performance on almost any objective measurement by using ICs. If you want a clean, noiseless VCA that doesn't colour the signal or feed through the control voltage, then this one is not for you. Nonetheless, the all-discrete amplifier is fun to build, and its unique distortion may add something interesting to a synthesizer patch. It's meant to be a VCA that you can hear.

Exponential response curve and AC-coupled output make this module best suited for audio rather than CV purposes.

  • 10 mA +12V
  • 10 mA -12V
  • 0 mA 5V
  • 40 mm deep

Module is available as a DIY project only.

No info about availability.

submitted May 14th 2016, 15:58 by mskala | last Change Jun 5th 2019, 13:21 by iSapien1956672

Buy Online

These merchants probably sell this module. Huh?