Dual Mirror Core VCO

“The VCOs I'm calling "Mirror Core". It's our take on the internals of a CD4046 VCO, only built out using separate components. The CD4046 VCO didn't have high linearity for tracking in mind, so we've improved this significantly. I call it Mirror Core because it uses two opposing sawtooth cores, which is able to generate a perfect 50% square wave.

One of the more unique features is that we expose a logic level unipolar output, which can be used for clocking and logic purposes.

Features of the VCO:

Coarse/Fine tune controls.
1V/Oct input (high tracking range)
Linear FM input
PWM control
PWM CV input
VCO/LFO switch

Saw wave out
Tri wave out
Sqr 50% wave out
PWM wave out
Logic pulse out
Sine wave out

VCA in
VCA out
VCA CV in

Lockhart folder in
Lockhart folder out

Control Board Features:

XOR A in + LED
XOR B in + LED
XOR out + LED

Dual Edge Divide by N and Divide by N.5 in
Dual Edge Divide by N and Divide by N.5 out
Dual Edge Divider 16 position rotary
Dual Edge Divider Edge Select switch
Dividided signal LED

LED driver 1 for VCO 1 Logic Pulse Out
LED driver 2 for VCO 2 Logic Pulse Out

Integrator in
Integrator out
Integrator Range control

• 120 mA +12V
• 75 mA -12V
• 0 mA 5V
• 115 mm Depth

Available as an assembled Module and as a DIY project.

This Module is currently available.