This circuit was found in an Electronics Now from the 90's. The integrated regulator circuit and the power transistor must be equipped with heat radiators.
We have in the figure as a monostable a proximity switch where our body capacitance (estimated at 200...
Suggested by Siliconix in documentation from the 90s, this circuit can present gains of digitally...
This amplifier with old germanium transistors is from a 1957 documentation. The power is a few...