This module is a combination of four simple VCA circuits run into a summing mixer. It was designed primarily to work with audio signals, being the final module in a system before going to an amplifier or recording interface. It was designed to be built by beginners, be as simple to use as possible and to use inexpensive parts. Each VCA his it's own individual output which is wired to be taken out of the mix when used.

This PCB is available with footprints for DIP or SMD versions of the LM13700. All other components are through hole, the 13700 is the only part becoming harder to find at an affordable price through hole.  

Demos, build documentation, drill guide, are available here.

Unfinished panels are drilled by hand in my garage, they are bare aluminum that may be scratched.  They are intended to be painted, etched or otherwise finished later.

Pre-Assembled Modules are built after the order comes in.  Build time can be a few days or a few weeks depending on what parts I have on hand.  When ordering, please leave a comment at checkout if you have preferences on what color(s) the panel is painted.