This circuit was found in a 1965 Electronic Design. What it does is respond only to positive pulses (above zero volts) and can be used in automation systems.
This circuit is for analog TV video signals and was found in the March 1988 issue of Radio...
The varactor or varicap diode tunes the signal for listening to SSB signals on a common receiver. The...
Available at Mouser Electronics this component of Diodes Incorporated consists of a voltage...