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This power supply has an output of variable voltage from 1.3 to 15 Volt because it's based on an LM317 regulator in order to obtaining those voltages while a 0-15V Analog Monitor shows those ranges of reading with help of a potentiometer. Go to: http://www.youtube.com/watch?v=nWfUacvEBIw
 
What you will need:

Soldering iron and solder
Helping Hands
Needle nose pliers
Wire cutters/strippers
Wire #22
Multimeter
Electrical Drill
Drill Bits: 1.5", 3/8", 5/16"
Krazy glue

Step 1: Bill of Materials

Picture of Bill of Materials
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1 ABS Plastic Box about 7"x 5" x 3"
1 Analog Voltage Power Meter 0-15V
1 Resistor 1.5 K Ohm, 1/4 Watt
1 Connector BNC Receptable
1  23" Alligerator Clip to BNC Cable, Type Cable Black
1 Potentiometer 10K Ohm with switch
1 Knob 1/4" with Screw
1 Standard Regulator 1.2 Volt to 37 Volt, 1.5 Amp
1 TO-220 heatsink with 1 Hole
1 AC/DC Unregulated Wall Transformer 9V, 0.6A ( For obtaining about 16.3 Volt)
1 PCB 2" x 2"
1 Capacitor Radial 1uF, 25V
1 Ceramic Disc Capacitor 0.1uF, 25V
1 Resistor 220 Ohm, 1/4 Watt
1 Power Jack Connector Male
 

I'm planning to build my own lab psu and this is a really nice project! There's one thing I don't understand though: how could you get 16V from a 9V wall wart?

Thank you!

braulio777 (author)  ade angelis1 year ago

I used an unregulated wall transformer of 9VDC and it gives me about of 16V.

Thank you for your question!

Thank you! :)

carlos66ba1 year ago

I'd recomment you use something OTHER than a BNC for the output. BNC is not really meant for high current, I think. I

If you could change power meter to volt meter which is closer to what it is. Power is measured in watts and for dc is current * voltage.

you wrote 1.5V in the title, instead of 15V...

braulio777 (author)  andrea biffi1 year ago

Thank you Andrea !!!

zikzak11 year ago
With a mini LED meter and a smaller pot, you could almost put this into an altoids box. the box could be part (if not all) of the heatsink. (Assuming the use of a laptop power supply or other wall wart transformer delivering 18v or more and at least 1.5 amp) Just a thought. Bench space gets used up way too fast!! I like the use of the BNC connector, but for those without, speaker terminals work well too. Nice afternoon project though!