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.
Obtained in a 90s Radio Electronics, this configuration appears with variations in other points of...
This detector uses an unusual sensor today. The circuit is from an 80s documentation. Its...
This alarm with the 555 integrated circuit is from an EDN from the 90s. The circuit directly...