R7 '73 Envelope Generator

Paperface Envelope Generator

The R7 Envelope Generator is a classic function generator circuit from the 73-75 era paperface modular system. With added modifications such as cycle switch, manual start push button and variable shape control (Lin/Expo/Log) of the envelope shape.

Features:

Rise / Fall Controls
Voltage Control over Duration (effects both Rise and Fall rates)
Shape Control (Exponential, Linear and Logarithmic responses)
Start Input (Think of this as your “trigger input”, it starts the EG)
Hold Input (This holds the envelope in it’s cycle when the input goes high/5V at the input)
Cycle Switch (Same as patching End out to Cycle Input, When cycling, the cycle input is not active)
Cycle Input (more like a “gate input”)
Window Size Control (Window comparator for providing a Gate output of specified width of the Envelope Cycle)
Voltage Control over Window Size
Window Output (5V Gate based on the window size)
End Output (outputs a pulse at the end of the Envelopes fall stage)
Envelope Output (0-5V)

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