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 with two operating modes was found in the September 1989 issue of Radio Electronics...
This TTL divider divide by 0 to 9 the frequency of a signal applied to its input. Maximum...
This circuit can be used for signaling a panel with a common incandescent lamp. The lamp will...