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This is a small size power supply with low cost and easy to make that only taking about 5 more hours. I was very happy with it and would share with you.
Power Supply Specifications
Input: 5v-16v/3A DC
Output: 1.3V - 15.5V/2 Amps
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Step 1: Materials and Tools
Here is a list of materials and tools I used for this project.
2 x LM2596S DC-DC module link
2 x Voltage/Current DC0-100V LED meter link
2 x WXD3-13-2W-10K link
2 x D3-13-2W knob link
2 x 4MM banana jacks(Red + Black) link
2 x 4MM banana sockets(Red + Black) link
1 x switch 117S 8.5*13.5MM link
1 x Power Jack DC-022 DC 5.5mm 2.1mm link
1 x AMS1117-5V link
1 x 5V 30mm fan link
6 x 2.5mm/6mm screw
1 x DC adapter 16v / 3A, the voltage range between in 9v~16v would be better.
3D printer with PLA withe & gray color
Step 2: Make the Enclosure by 3D Printer
Download the STL file from here http://www.thingiverse.com/thing:1420193
And take about 2 hours to print them.
I have removed the USB slot which the 2 holes on the front panel, the new one will not be any hole on it.
Step 3: Modify the DC-DC Converter
take away the small one of potentiometer which is on the DC-DC module, and replace the big one of potentiometer which shown in the picture. The picture 1 is not correct, please follow the number 3-3, 2-2, 1-1 to connect together as picture 2.
Step 4: Schematic and Diagrams
Refer to the diagram to connect all of parts together
Step 5: Assembler
put all of parts into this enclosure, and use the tape to protect the boards and wires to prevent any short circuit.
Step 6: Testing
Plug in the 16V DC adapter , and switch on.
Tune the voltage and measure by multimeter to see the result.
That's all and have fun.