[sdiy] PWM from a Micro as a CV source?

[jpdesroc at oricom.ca]

Just look at these Voltage controled ADSR or LFO
made by Tom Wiltshire. 
http://www.electricdruid.com/index.php

These use PWM out signal
filtered by a 2nd order low pass filter
as a CV envelope.
Those circuits can have a rise time 0-5v of 1msec.
JPD