This protection circuit for standing waves was found in a manual of high frequency circuits and transmitters from the 1980s. The circuit is used with transmitters.
Another of the many tachometer circuits we have on our site. This one is from the September 1976...
This circuit can be used with the CIR12053 receiver or with others shown in this section of the...
This simple 1-transistor reflex receiver was published in Radio Electronics magazine in September 1959....