j3rk mirror core VCO

Dual VCO with waveshaping control center

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 (more or less) 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

https://www.muffwiggler.com/forum/viewtopic.php?t=69271&highlight=mirror