Demo of my soldered ADSR envelope generator built after the design of René Schmitz. It uses a bipolar NE555 timer and an LM358 OpAmp.

For the gate, I use a simple push button to the positive rail.

I try out the four potentiometers and how they effect the audio. Sadly, the microphone of my mobile is quite low quality.

Next modules to build will be a proper 1V/Oct VCO to replace the remaining circuit on the solderless breadboard and a keyboard for input.