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A 1K resistor has been included in the Envelope Output signal to maintain output impedance compatability with other modules in the system.
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To prevent negative trigger signals from falsely triggering the ADSR, a series blocking diode has been included in the Gate Input circuit.
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To minimize voltage overshoot and to limit the inrush current at minimum ATTACK setting, a 10R resistor is now included in series with the ATTACK pot.
- Experience has shown that setting the Gate Trip Level to maximum can result in severe damage to the LM358. Readers should be extremely careful when setting P406 to ensure that they do not take it to the maximum setting. Ideally, P406 should be replaced with two resistors as shown in this schematic. The values of these should be chosen to give an overall resistance of around 100K and the desired voltage drop at the junction to the LM358. The values shown will result in a GATE signal in excess of 2.5V triggering the ADSR.
Future design enhancements include:
- Voltage control of ATTACK, DECAY, SUSTAIN and DECAY parameters