Photo Logic Multiplex
This is a simple sound machine, it works on a similar principle to my logic multiplex but with slightly altered functionality and greater depth of LFO control.
It utilizes a 40106 schmitt inverter to make 3 light controlled oscillators with LDRs (Light Dependant Resistors) and 3 LFOs which just use pots. These are connected to a 4051 multiplexor connected as a programmable gate or “ANY” gate. I had a DIP switch lying around in some old electronics which I used as the switches in the diagram below. Scavenged wood and metal were used too, for the box.
At the time of posting, this device is for sale here:
