There were no build notes with this but its pretty simple so was easy to figure out.
Parts:
Resistors: 390R x 2
Diodes: 1N4141 x 1
Capacitor: 1500pF or 1.5nF (152)
Misc: Vactrol, jacks, panel, pcb, LED
These are not official build notes... just my record keeping in case of future trouble shooting.
So what exactly is a low pass gate?
The term was first used by Don Buchla and was used in the 200 series 292 module.
It can behave as a VCA, a low pass filter, or a combination of both.
The Buchla design used a vactrol to process the control voltage input. The choice of a vactrol was a stroke of genius as it introduced non-linearities which made the lowpass gate a good module for making percussion sounds like hand drums, bongos,congas & steel drums.
I'm not sure what vactrols are used in the version as the labeling appears to be blocked out.
So this shall remain a mystery. Don used VTL5s . You could also make your own using a LDR and a LED.
The NLC Dual LPG is a good example of how to do this.
The gates are I think 6dB slope ... that is single pole/
What surprises me about this module is just how good it sounds ........and all without any power .
A single trigger pulse is all you need
a REALLY simple build ... great as a starter SMD project.
Useful Links:
1. CGS/Elby - Ken Stone's LPG
2. Buchla Tech - Verbos's excellent blog - 292c Secrets with schematics
3. Synth.NL.Blog - 292 5U build notes
4. Modular Synthesis - Build notes for Thomas White's LPG clone.
5. Doepfer A-101-2 LPG filter
6. Natural Rhythm Music - Thomas White
7. NLC Dual LPG
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