A Bob Pease tribute, this LM331 voltage-to-frequency kit was the first Boldport Club project. I joined the Boldport Club rather late, and missed out on the original Pease kit (now out of stock). But I did manage to snaffle the PCB in sale of “Just Less the Perfect” boards. Since I was kit-less, I decided to experiment a bit and slow down the frequency - the end result is a light/voltage controlled “blinky”. As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub
Here’s a quick demo video to show it works..