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In Reply to: RE: Anyone know about linear power supplies, single transistor. posted by Coner on April 12, 2023 at 19:46:29
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.
Follow Ups:
Linear regulators typically do not require a minimum load. Some switch mode power supplies do.
Yeah, I'm aware, but I've seen cases where residual and a high-impedance voltmeter can confuse the issue.
In this instance, I don't think we could say for sure until the PS is measured with a load.
Dave.
Yes, a tiny diode from rect. bridge to reg. pin, and a 220 1/2w resistor from same pin to reg. case. Nothing looks discolored, etc. Okay, will try a load in the morn. Thx much!
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