Found in a 73 magazine for radio amateurs of the 1980s, this circuit uses a dual-gate MOSFET. This component is not currently common.
This circuit controls the passage of the signal from an input to an output using a DC signal from a...
The basis of this circuit is the 723, an old integrated circuit not easier to find these days. The...
This circuit is from a project published in the March 1996 Electronics Now magazine. The author used...