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 simple standing waveform (ROE or SWR) meter is used to adjust antenna matching with...
This circuit measures the temperature through the voltage drop across a diode. The circuit was...
This circuit uses an unusual PLL, the 4046 CMOS. We found it in the October 1994 issue of...