VCM - Voltage Controlled Mixer
VCM - Voltage Controlled Mixer from Brian Tuley
VCM - 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. 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.

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A straight edge is useful for keeping text horizonal and for drawing a straight line here or there. I like to keep it simple, to minimize mistakes. The paint marker can be a little messy to work with.
Before committing to the drill press I like to lay the parts out to see how they might fit best.
Laying out the pots and jacks to make sure that everything will fit.
I have used 2" standoffs which leave enough room to clear the pots and jacks when I mount the PCB to the inside of the face plate panel.
A white fine tip paint marker works for naming the inputs and outputs and knob functions. If I make a mistake, there's enough time before drying to wipe away the paint with lighter fluid, and try again.
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Side view with everything installed into the face panel. Cable ties are an option when component leads are too long or messy.
Four screws hold the module securely in place when mounting the unit inside the modular synth cabinet.
The Neutrik switch jacks that I had originally used on this build are dysfunctional. I have decided to replace them with an alternative switching jack.
Side view with the new jacks in place.
Alternate side view. The VCM module works great with the replacement jacks.
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VCM - 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. 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.

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Brian Tuley
Electronic Engineer Brentwood, CA