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.
This hybrid power supply circuit was found in the August 1997 issue of Electronics Now magazine. The...
In the figure we have a security system consisting of a sophisticated alarm found in a 90s edition...
The simple transistor test shown in the figure can be powered by a 9V battery. The test is for...