This circuit with TTL integrated circuits was found in the December 1987 issue of Radio Electronics magazine. The circuit uses a LED scale and is suitable for gaming applications.
Found in a 1964 Electronic Design, this circuit makes use of period components. The components are from...
This circuit was published in an English magazine from 1977, but it can be easily assembled since...
This simple oscillator is yet another of the many versions of sonic insect repellent that we find...