Electronics Forum > Design, Project

scratch built LM317 varible supply

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The Radio Shop:
I have been needing a new bench supply for a while now. The last day I was in Radio Shack I picked up one of there 24 volt 2 amp transformers for 5 bucks. So I decided this morning to throw a supply together from some spare parts I have.

Parts List:
•One  perfboard
•LM317 variable voltage regulator
• Bridge Rectifier
•Heat Sink
•120 VAC to 24 VDC transformer (mine is part number 273-1512b Radio Shack)
•Power cable
•Two 1000 microfarad capacitors
•One 0.1 microfarad capacitor
•One 1 microfarad capacitor
•One 100 ohm resistor
•One 5k ohm variable resistor
•One 1N4002 diode

The case is one I bought 10 years ago. I had removed the 13.8 supply from the case to go in my homebrew 6 meter rig. So the empty case came in handy.

The Radio Shop:
All finished and it works great.
Need to check the ripple on it to see how it looks.
Usable range from 1.2 volts to 24 volts

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