The purpose of this circuit is to measure the resistance of an antenna at the resonant frequency. The circuit is from an old American documentation for hams.
The basic purpose of this circuit is to apply an audio signal to a video carrier for sound and...
Found in a 73 magazine for radio amateurs of the 1980s, this circuit uses a dual-gate MOSFET. This...
We found this Vox in a 1969 Motorola documentation. Transistors support modern equivalents and the SCR can...