Musical envelope generator and modulator

  
When a gate voltage is applied, Ql is turned on and capacitor C is charged via the attack pot in series with the 1 K resistor varying this pot, attact time constant. A fast attack gives a percussive sound, a slow attack the affect of `backward` sounds. When the gate voltage returns to its off state, Q2 is turned on and capacitor is discharged via decay pot to ground. The envelope is buffered by ICl and applied to Q3, which is used as a transistor chopper. A musical tone in the form of a squarewave is connected to the base of Q3
Musical envelope generator and modulator - schematic

This turns the transistor on or off and thus the envelope is chopped up at regular intervals, the intervals being determined by the pitch of the squarewave. The resultant waveform has the amplitude of the envelope and the harmonic structure of the squarewave. IC2 buffers the signal and Dl ensures that the envelope dies away at the end of a note.




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