This is a battery powered 3W power amplifier using germanium transistors. The circuit is from an English documentation from 1967. The transistors are from the time.
In the figure we have the way to obtain an adjustable constant current source of 2 mA. The...
We found this circuit in a Popular Electronics of the 90s. The circuit can be easily mounted...
This circuit provides an output voltage approximately 2 times that of the input voltage. The...