NEW PCB REVISION: DIP package LM13700s have been replaced with SMD LM13700s due to the DIP package chip going out of production. All other parts are still through hole. If you'd prefer a PCB for a DIP 13700, let me know when ordering, they're still available.
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 module is completely analog and works with 12V or 15V systems. It does require calibration.
For complete descriptions of the way the module is used, and how to build it, including schematics and parts list; download this PDF file.
Boards are available now. Price for 1 PCB is $8.
Unfinished eurorack
panels are available for this project, they are 12HP and cost $8 each.
There is
more information here about panels. If you're interested in drilling your own panel for
this project, feel free to use my
drill guide. That image should be printed at 300dpi for proper
scaling.
