High impedance stage (CB20564E)

This high input impedance amplifier stage was found in a 1963 documentation. The transistor germanium of the time.

Low Power MW Telegraphic Transmitter (CB12917E)
This AM micro-transmitter with power that can reach a few meters is from a publication from the...
12 V Emergency Light (CB13498E)
This circuit is from an American publication from 1978 and can currently be assembled with minor...
Automatic 555 Hand Flashlight (CB25504E)
When the power is cut off, this circuit keeps the flashlight on for a while, allowing it to be...