Simple 6 and 12 V power supply (CB23836E)

This simple circuit is from a Radio Electronics from August 1952. The current depends on the transformers used. Note that the output is switched.

90 to 150 MHz receiver (CB20230E)
This simple super-regenerative receiver was found in American documentation from the 1980s. The...
MOSFET Progressive Power Supply (CB19373E)
We have already explored this configuration in several projects on our website. What the circuit does...
Transformer Audio Output Stage (CB18304E)
This circuit with only one transistor was found in Japanese documentation from the 1960s. The...