This 100 Hz filter was found in the August 1993 issue of Electronics Now. The components can be modified to operate at other frequencies.
Here we show an oscillator that uses an LC network. The upper limit depends on the power-supply...
The ESDZ series of protection diodes from STMicroelectronics can be purchased from Mouser...
This 7400 TTL circuit has a memory, keeping the LED on when a pulse is detected. The circuit must be...