Some build notes for the Nonlinear Circuits Pills module.
It's a 1U eurorack format.
Here are Andrew's notes:
BOM:
There are 5 inputs & 4 outputs
The inputs:
CV range 1, CV range 2, FM in, CV1, CV2
Everything affects everything:
FM IN - feeds both PLL ICs CV Range 1 & 2 - these control the vactrols.
The control circuits are very simple…..a resistor and a vactrol!
CV 1 & 2 - these inject a signal into the VCO control input, shove in anything
from audio to CV rates and see what you get.
The outputs:
VCO 1, VCO2, PM 1, PM2
These are from the PLL VCOs and the phase comparators, all are pulse/square waves
running from 0-approx 5V.
The build is pretty easy. ICs first.
The IC is a 4046
Make sure the 4046 is rated for at least 15V, some types are 74xxx series and will die in this circuit
Then install passive resistors, caps
The two vactrols are best if DIYed.
The vactrol circuits are as simple as possible, so it is best to use a
superbright LED and a GL5516 LDR
Here is a bit of info re DIY vactrols:
The anode of the LED side is the long lead
Heat shrink for the vactrols works well.
Use a few layers to exclude as much light as you can
I'm using a a 4k7 resistor for the RL.
I'm using a 10R for reverse voltage protection
jacks -- top one 1st
The green PCB connects to the panel holding the jacks with 4 groups of headers.
almost there
This is the rear of the panel
The finished module
