The signal from this transmitter is injected into a cable that you want to follow along a pipeline. Monitoring is done using an ordinary AM receiver out of season.
This circuit, found in 2002 documentation, triggers LEDs when a phone call is received. The LEDs...
It is an ideal assembly to be implemented as work by students of digital electronics courses, as...
This control circuit for direct current motors uses a 741 and an operational one of unusual power...