Voltage Controlled Mixer

From MMM Wiki

Jump to: navigation, search

Voltage Controlled Mixer


The VC Mixer consists of 4 channels.

Each channel has an associated gain control and control voltage input.

There are two outputs; Normal and inverted.

The control inputs respond to a 0-5V control voltage input. 0V is fully attenuated and 5V will produce a 100% output level.

The Level control attenuates the channel level.

The control inputs are cascaded. 5V is applied internally to the Control input for the channels and cascaded from channel 1 to channel 4. This allows the module to be used as a 4-channel mixer with no control voltage input to the Control in jacks.

When a Control input is plugged into a channel Control in jack, it interrupts the 5V from that channel through channel 4 allowing the gain for that channel, and all subsequent channels to be controlled by the new control voltage. New control voltages applied to the subsequent channels will interrupt the preceding channel control voltage for that channel and be applied to the remaining channels.

The trim pots on the circuit board are labeled with the associated CV gain adjustment and are set for a 1:1 input to output ratio. They can be trimmed to provide additional gain to utilize the mixer as an amplifier, if so desired. The gain will clip the original signal and can be set to overdrive the signal into a square wave peaking at the positive and negative power supply levels.

The mixer will work with both audio and CV inputs.


This module is available.


Assembled/ tested board only: $105.00


Current draw:

V+= 35.5mA

V-= -37.5mA

PCB board dimensions:

3.125" (3-1/8") 79.38mm X 2.625" (2-5/8") 66.68mm

Mounting holes: 0.125" (1/8") 3.18mm (for 4-40 screw) 4 holes, one in each corner

Mounting hole spacing; Length: C-C= 2.925" 74.3mm, Width: C-C= 2.425" 61.6mm

Personal tools