Automatic Garage Door Opener (CB24113E)

This SCR automation circuit was found in an April 1971 Radio Electronics magazine. The circuit activates a relay that opens the garage door.

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...