This circuit is from Motorola's 1990 Linear Databook. The transistors allow equivalents and the output power depends on the supply voltage. The power supply must be 30 V symmetrical.
This is the traditional configuration of a 5 V supply with the 7805 for a current of 1 A. The...
This circuit was found in an American 1980s documentation. The transistorized step is the...
This 90's project shows how to use an old cassette recorder to practice telegraphy. In position A of the...