LZX cadet VIII - Video Synth - Hard Key Generator

Some pics of the Cadet DIY modular video synth build.
I am an independent builder and have nothing to do with LZX industries.
These aren't official build notes, just my records to help me trouble shoot.
It's a work in progress.
Do let me know if you spot any errors or omissions.
This is module no.7 (Hard Key Generator VII).

It's a wideband voltage comparator with voltage controlled threshold level.
A voltage comparator is an electronic circuit that compares two input voltages and lets you know which of the two is greater.

The ICs used are:
TL072 - a pretty standard Op amp
TL431BQLPR  - Adjustable Precision Shunt Regulator
LM6172IN/NOPB - Operational Amplifier - Dual High Speed, Low Power
LM361N/NOPB - Analog Comparators Hi Speed Diff Cmptr

1stly, the power section - reverse voltage protection & 5V regulator

..

ICs etc used in this project

LM6172IN/NOPB

TL431BQLPR
TL072IP

LM361N/NOPB

 Mods:

+The C8 hard key circuit can be adapted to provide a pulse width modulation CV and output. Just send the triangle wave into the key input and threshold becomes pulse-width.

Links:
LZX official
Muffs - Cadet series DIY/assembled

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