Battery Sequencer

4-step CV sequencer for Eurorack. It sample DC voltage from old batteries.
CV output voltage range: from 0V to 5V.

 

Components:

TL072 Op-amp x1

CD4066 Quad Bilateral Switch x1

CD4017 Counter/Dividers x1

555 Timer x1

BC547 NPN transistor x2

220Ω Resistor x5

1kΩ Resistor x10

3,3kΩ Resistor x1

22kΩ Resistor x2

1MΩ Resistor x1

1,2MΩ Resistor x1

Toggle switch x1

Potentiometer 10kΩ x1

Mono Female Audio jack x2

Battery slot AAA 1,5V x4

Led x4

 

Schematics:
scn