Geiger counter, it's a word that most people have heard about. I'm sure everyone has seen at least one piece of media featuring the clicking box with a little dial that only tells you when you're ...

So [Todd] has set out to build an Arduino frequency counter for a Kenwood TS-520S HF ham radio. This post (and the video found after the break) doesn’t cover the entire project. It’s rather ...

The inside electronics reveals a fairly typical STM microcontroller-based pulse counter circuit that uses one of the counter/timer inputs to record the falling edge of pulses delivered by the ...