Moog 911 - Envelope Generator

Moog 911 Envelope Generators need S-triggers to start their cycle.

Moog's designers wanted people to be able to plug in a simple foot switch to trigger sounds, 

The original design of this module is from around 1968. 

The Moog 953, 952 or 962 Keyboard will produce S-triggers.

"So will Moog Ribbon Controllers, Percussion controllers , Sequential Controller Complements and Envelope Followers" (Moog Manual)

In comparison,  V-triggers start at zero volts and rise to a standard level .. usually 3V.

Specs

Trigger Input : Switch Trigger

Output Impedance 10K ohms

Time range on T1, T2, T3: 2 milliseconds to 10 secs.

Peak DC output on Esus : 5.5V (+/-10%)

The 911 plugs into the Moog modular using a 22 pin PCB/edge card connector.

It's a ADSR envelope generator.

The pin out is as follows:

1. +12V at30mA

2. GND

3. -6V at 15mA

14. Trigger out

15. Shield

21. S-trigger in ........to Trigger switch (Jones S-302)

22. Shield

The Moog manual suggests a regulated AC supply, such as a Moog Model 901 or dry batteries.

Max current is 50 milliamperes.

Range of T1: 10 ms to 10 secs (attack)

Range of T2: 10 ms to 10 secs (delay)

Range of T3: 10 ms to 10 secs (Release)

Range of  Esus:  0 to Emax

Esus = sustain.

Emax = voltage at which T2 begins. = 5.5V +/- 10%

You trigger the 911 by closing a switch. So unlike most EG's you will encounter today, no voltage is supplied to trigger the module ... its quite the opposite.

You need a 916 interface to convert CVs to S-triggers

" the 911 Envelope Generator produces a single voltage contour whose time/voltage variation
 is determined by potentiometers T1, T2, T3, and a time constant sustaining level potentiometer (Esus).
Closure of the input trigger switch directs the voltage contour to T3 (final decay) regardless of
what stage (T1, T2 or E) was in current operation."

                                                                                                              (Moog Manual)

"The 911 Envelope Generator completes one of the most important musical functions:
That of producing a variable one-shot control voltage contour in time.
This output is thus capable of controlling any voltage controlled module – most notably
a Voltage Controlled Amplifier – resulting in the articulation of a single sound."
                                                                                                                 (Moog Manual)

A common module to pair with the 911 is the 911A - The Dual Trigger Delay.

This can create multiple or combined DC voltage contour outputs.