My 2nd power supply kit. My goal was to gain more experience with power supplies.
My issue with this is that the input voltages are awkward values. 18VDC or 15VAC.
Rather than an adjustable output voltage, the output voltage can toggle between 3V, 4.5V, 5V, 6V, 9V and 12V with an indicator LED. 6 pots are provided to calibrate the output voltages.
Schematic
