Music Tech DIY • Voltage controlled DAR Envelope

This is one more voltage controlled envelope generator in a series built around the Atmel AVR 328p and the MCP4921. Generates a delay/attack/release envelope on rising edge of gate. Retrigger possible during attack and release. Delay/attack/release time is manually and voltage controllable. Gate is polled every loop. CV input parameters are read with timer0 interrupt ISR (TIMER0_OVF_vect). Delay-, attack-, release- and EOC LED and outputs are switched. Software driven. The software is kept as simple as possible, so you can easily adapt it to your needs. Status signaled with LED. The attack and release timing is determined with tables, so you can easily adapt the timing to your needs as well.

Specs and features

Delay, attack, release envelope
All parameters voltage controlled
Triggers at +3V
Triggers at any waveform
Software driven
Buffered outputs
Overvoltage protected inputs
Status signaled by LED
Status outputs
Runs on +/-15V and +/-12V
Power consumption around 35mA positive, 10mA negative rail


The documentation and the Gerber files for download are here and on my website.
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Statistics: Posted by Haralds:Werk — Sun Mar 16, 2025 11:55 am — Replies 1 — Views 48

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