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.
We found this circuit in an Electronics Now from the 1990s. The circuit crashes when light strikes the...
This circuit was found in the February 1993 issue of Radio Electronics magazine. Some components depend...
In the figure we have the way to use a common LED as a light sensor. The operational power supply...