We found this tube receiver in a 1950s Japanese publication. The circuit uses 5 tubes and has an RF amplifier stage for greater sensitivity. The power supply is not shown on the circuit.
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...