We find this circuit in American documentation from the 1980s. It consists of a frequency folder using a varicap. The capacitors and coils depend on the frequency of operation.
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...