In my last few posts I’ve been writing about using an Arduino to generate waveforms. Part 3 of that series is still in the works (I’ve not forgotten, honestly!) – but this time I want to write about an alternative way to make a simple waveform: using good old analogue electronics, without the need for a microcontroller.
To do this we’ll use the ubiquitous NE555 timer chip (or just a 555 for short).