This Power supply sources from 500 to 1,000 mA according the transformar and was found in a publication of the year 1958. The diodes can be now the 1N4004 and the transistor should be mounted on a heatsink.
This ultra-low power metronome was found in a 1991 documentation. The output transistor is general...
This small transistor amplifier was found in an ancient American documentation. Transistors can be replaced...
This circuit is from an American documentation of the 1980s. The circuit can be implemented with more...