This circuit is from an old American documentation and its use in motorcycles with 12 V is suggested to power 6V radios. The transistor can be the BD136 and BC548.
In the figure we have a simple amplifier stage for BC547 series transistors. The gain is...
We have here a very interesting project found in a 1982 publication. By the operation of the...
The circuit shown in the figure is suggested by National Semiconductor and makes use of an...