This long interval timer was found in the September 1976 issue of Radio Electronics magazine. The output can be used to control a relay. The circuit achieves timings of up to 14 hours.
This simple circuit uses a car ignition coil. The circuit appeared in the 1983 Radio Electronics Annual...
Found in Popular Electronics, this sophisticated short-wave receiver requires a lot of skill from...
Found in Motorola documentation from 1967, this circuit shows how it is possible to obtain a...