Instructables
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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

 
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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

Step 2: Preparing your ABS Plastic Enclosure

Picture of Preparing your ABS Plastic Enclosure
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In the front side of your enclosure, you need to drill 3 holes so that you can install the Analog Voltage Power Meter, the BNC connector, and the potentiometer with switch.  Those holes should from left to the right: 1.5", 3/8", 5/16" respectively.

Step 3: Preparing your Analog Voltage Power Meter

Picture of Preparing your Analog Voltage Power Meter
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Observe the back side of your Analog Voltage Power Meter and connect the resistor of 1.5K Ohm to its positive terminal.

Step 4: Preparing your BNC Connector

Picture of Preparing your BNC Connector
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In this step, it's important that the positive and negative terminal be identified so that you can connect correctly this device. Also, should remember that this BNC connector has center positive, in this case, you will take like positive terminal the central terminal of this component.
ade angelis10 months ago

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 angelis8 months ago

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

Thank you for your question!

Thank you! :)

carlos66ba10 months 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

russ_hensel10 months ago

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.

andrea biffi10 months ago

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

braulio777 (author)  andrea biffi10 months ago

Thank you Andrea !!!

zikzak110 months 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!