Current regulator (CB22268E)

This circuit was found in documentation from the 60's. The low current transistor is from the time. Modern equivalents can be tested.

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...