This simple receiver of two transistors for the 80-meter range was found in an American documentation from the 1980s. The transistors admit equivalents and the antenna must be long.
The circuit shown below provides four adjustable reference voltages. Each of them is produced by a...
This small blocking oscillator for approximately 1000 Hz was found in an American documentation from the...
Found in 1969 documentation, this circuit supplies a load after an interval given by R1 and C1....