Even today, for some applications it is hard to beat the ubiquitous 555 timer IC. It is cheap ... one or two transistors, a flip flop and an inverter. The idea is you use a capacitor to charge ...

With a 555 on the BOM, you never know what you’re going to get. With 40 of the versatile timer chips in a build, you might just get something completely unexpected, like this 555-based eight-bit ...