This circuit, suggested by an Electronics World of 1969, keeps a blinking LED for a while when a power outage occurs. Time depends on capacitor C1.
This circuit was obtained in a 1970 EEE and applies to almost any operational amplifier. The...
The circuit shown in the figure generates a square signal (50% active cycle) when the pressure switch...
We found this transistorized AM receiver of the regenerative type of excellent quality in a...