This frequency counter is [Miguel Pedroso’s] entry in the 7400 Logic contest. After looking at the design we think this is a perfect project for those who have not worked with logic ICs before.

Four people answered 'yes'. What is the relative frequency of left-handed people? Q2. A white counter was taken from a bag of different coloured counters, and then replaced. The relative frequency ...

There’s a transformer for the linear supply, through-hole components, and an Intersil frequency counter on a chip. Everything is easy to get to and large enough to see.