Using a 4046 PLL, which is uncommon today, this circuit was found in the October 1994 issue of Electronics Now magazine. The circuit can be modified by changing the capacitor.
This simple timer, which activates an LED indicator, but which can be modified to activate a...
This circuit was obtained in a documentation for radio amateurs in 1974. The coil consists of 12...
This circuit was found in a 1973’s Japanese magazine. It uses transistors of the time and is...