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.
The circuit shown in the figure was suggested by National Semiconductor in its 1994 Linear...
This circuit can be controlled by an LDR causing an LED to flash at a frequency given by C2. The...
This hybrid power supply circuit was found in the August 1997 issue of Electronics Now magazine. The...