ASM-2 Construction Guide
ELBY Designs - Laurie Biddulph
9 Follan Close, Kariong, NSW 2250, Australia
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ADSR Envelope Generator
Power up, Testing and Calibration Procedures:
ADSR 1
MAXIMUM ENVELOPE
1. Monitor TP9 and adjust P400 for 5V0
ATTACK PEAK
1. Set [ATTACK], [DECAY] and [RELEASE] to minimum and [SUSTAIN] to maximum.
2. Set P406 fully clockwise
3. Apply a low-frequency square wave (around 1-5Hz will be fine) to the GATE input
4. Monitor [ADSR 1 OUT] which should exhibit a square wave in time with the frequency
of the GATE signal
5. Adjust P406 so that the rising edge of the envelope peaks at 5V0 and that there is no
overshoot or undershoot.
This completes the setting up for the ADSR 1 module.
ADSR 2
MAXIMUM ENVELOPE
1. Monitor TP11 and adjust P450 for 5V0
ATTACK PEAK
1. Set [ATTACK], [DECAY] and [RELEASE] to minimum and [SUSTAIN] to maximum.
2. Set P456 fully clockwise
3. Apply a low-frequency square wave (around 1-5Hz will be fine) to the GATE input
4. Monitor [ADSR 2 OUT] which should exhibit a square wave in time with the frequency
of the GATE signal
5. Adjust P456 so that the rising edge of the envelope peaks at 5V0 and that there is no
overshoot or undershoot.
This completes the setting up for the ADSR 2 module.
ATTACK PEAK Adjustment
