PiLLs - NLC build notes

 Some build notes for the Nonlinear Circuits Pills module.

It's a 1U eurorack format.

Here are Andrew's notes:

https://www.nonlinearcircuits.com/modules/p/1u-pill

BOM:

https://static1.squarespace.com/static/5e6e99e8bd2f8a6de8454feb/t/5e779abc28dc473dd30b855c/1584896704526/1u_pills_build_and_bom.pdf

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:

+ Vactrols - Optocoupliers

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

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