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Original Message
RE: Anyone know about linear power supplies, single transistor.
Posted by Davey on April 12, 2023 at 19:58:32:
There's some other components in there me thinks. A resistor (or two) and probably a zener diode to provide the voltage reference.
17 volts with no load is not indicative of a problem. It's a very basic power supply and needs a load on the circuit to start regulating.
Dave.