Natural Rhythm Music - Lopass Gate

Features of the NRM-001 RLPG:

Up to 3 Audio Inputs
Up to 3 Control Voltage Inputs
Offset (Frequency) Control
Resonance Control
VCF/VCA/Both Modes (Rotary or 3PDT Option)
"Deep" Switch to set lower freq range
Inverted CV Out (From CV Mixer)
Jumper points to bypass mixer or remove resonance circuit
MOTM Pot Spacing
Compatible with www.bridechamber.com panels and parts kits
Additional synthesizers.com Power Connector
+/-15v or +/-12v
PCB Mounting for Alpha, Bourns, TT, or Vishay/Spectrol pots
Ability to use 2 Single or 1 Dual Vactrol (see below)
"Cool" people use Vactrols

This is a third cousin PCB that is a derivative of the famous Buchla 292c Lopass Gate. Don Buchla himself gave approval to this endeavor for us all to learn a bit more about analog synthesizer module design, and for this we owe him a debt of gratitude as a true scholar and gentleman. This is not the first, nor will it be the last Lopass Gate module to come out to the world. People have become transfixed on the magic of Vactrol's which are a combination of a resistor and LED in a light-tight package that seals out the light of the world yet somehow glows with an internal magic, that for the Synth_DIY crowd becomes hard to ignore.

Many have contributed to this PCB project and to the research supporting Vactrol integration to modular synthesizer design through various designs and ideals made public through the wonders of the Internet. These people include Don Buchla, Peter Grenader, Chris MacDonald, Mark Verbos, Grant Richter, electro-music.com members and others. We would like to thank them for their valuable contributions to our Synth_DIY community and for their brilliant projects which have helped to spawn a crowd of Vactrol addicts.

Building this PCB requires the same fundamental practices which we have generally put in practice with our other personal modules we have built. If this is your first module, or your 100'th I hope you find the documentation and support offered within to be satisfactory. However, if this "is" your first module I highly recommend you to find and frequent the dirty Internet watering hole for us synth junkies otherwise known as www.electro-music.com

Watch the videos, search the web, email me with questions. If this project suits your needs or triggers your interest you will find PCB's to be avilable through my PayPal cart linked here and on the store page. Many thanks!

Dave Brown has a great build report, mods, and updated parts list at: modularsynthesis.com