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.
Found in a 1969’s Electronic Design, this circuit operates in a narrow range of voltages....
This power stage with two counterphase transistors and coupling transformers was shown in Radio...
Found in old documentation, this circuit uses special discharge lamps (neon) of the time. The...