This simple circuit has good gain and can be implemented with any general-purpose transistor. The circuit is from Electronics Now, June 1997. The coil determines the frequency range.
This stabilized power supply was found in the 1974 Ferranti transistor manual. The power...
This circuit provides 2.5 W of power with 6 V supply and 4-ohm speaker. We found it in the Radio...
We found this circuit in a Radio Shack documentation from 1977. The circuit serves for a link of...