Electronics > Beginners

Made LM317 regulator without thinking

(1/1)

lordvader88:
I have the internal 24V SMPS from a printer, it's nice, IDK what the amperage might be, I'll check the mosfet as a guide.

So I wanted to make it variable so I used an LM317 and a 2N3055 circuit. So I was all happy to have it soldered up on a breadboard and then I realized I don't have the LM317 ref. pin on the OVERALL output, so of course it didn't work.

Its funny I never thought it through before I soldered it up wrong

lordvader88:
I hope I didn't fry the 2n3055 by putting 12.5V across the base-emitter junction. The only load was the +10MO or whatever it is of the DMM I used

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