This 3, 5, 6, 9 and 12 V power supply selected by a switch has a digital indicator of the selected voltage. The indicator is not a voltmeter, but only indicates the position of the switch. The circuit is from a 1987 publication and the 2N3055 transistor must be mounted on a good heat sink. The transformer is 16 V with 2 A of current. The displays are of common cathode of any type and diodes 1N4004 or equivalent.
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