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russ117044 asked How to vary the output of a DC power supply?
It has a fixed output of 30 VDC @500mA. I need to vary the out put somehow.
And got the following answer:
Vary the voltage? If you want to do it inside the supply, it depends on the design. Externally, you can use a 3 terminal voltage regulator like the LM317 that will give you an output that you can adjust between 1.2 volts and 28 volts. It will need a large heat sink. You can download the datasheet, it has circuits in it. .