This circuit is from a 1980's documentation for telecommunications. The circuit is used in SSB and the diodes must be suitable types for the application. The audio input is low impedance.
This RF signal meter has a switch position that allows calibration and comparison of low intensity...
This approach alarm was found in Radio Electronics from July 1990. The circuit must be powered by a...
This is one of the many 555 based car alarm circuits that we have on our website. We found it in a...