If you’re not familiar with the 555 timer, suffice it to say that this ... The probe feeds a 50-ohm terminated oscilloscope input. Testing in astable mode showed that the circuit was pretty ...

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 ...