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.
Despite being from a 1969 publication, the transistors used have current equivalents such as BC548 and...
Found in a 1990s American technical brochure, this circuit is intended for alarms that use as...
Found in an old Electronic Design, this circuit provides an output voltage that is the absolute...