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Every electronic hobbyist needs a variable power supply for prototyping and testing, but they can be very expensive. I will show you how to build a cheap yet reliable power supply.

Step 1: ​The Parts List:

The Parts List:

To build this specific power supply, you will need the following:

> 1x Switching Power Supply ( Max 32 Volts - Min 2 Amps)

> 2x LM2596 DC-DC Buck Converter

> 2x 10k potentiometers + Knobs

> 4x Female Banana connectors

> 2x Toggle Switches

> 1x Car Amplifier Enclosure Box

> 1x 16*2 Dual LCD Multimeter

You can build your own Dual LCD Multimeter following this guide

> USB Port (Optional)

Tools Required:

>Dremel and cutting disk

>Silicone glue

>Soldering iron

Step 2: The Beginning

>I started by fixing SMPS onto the PCB, which was then screwed onto the Enclosure Box.

>Applied Thermal Paste b/w Heatsink & Aluminum Enclosure Box.

>Then I made Multimeter from this guide and also fixed it to the enclosure box.

Edit: Circuit Diagram + PCB layout + Hex Code also have been attached.

Step 3: Modifying Front & Back Panels

>Using Dremel I was able to cutout space for LCD & Silicon glue was used to stick LCD with front panel.

>Using Drill Machine I made holes for Potentiometer & Toggle switches.

>Next wires from external potentiometers were soldered on to the boost converters.

>Voltmeter & Ammeter are connected to the outputs of boost converter.

>Heatsinks are installed onto the boost converter, also don't forget to apply thermal paste.

Step 4: Testing

>I have tested the bench power supply on variety of loads & so far there has been no problem.

>Final cost of this project was about 2000Rs which approximately equals to 18$.

>I hope this guide was helpful, let me know if you have any questions.

<p>This instructable is very lacking in detail.</p>
<p>Great job </p>
<p>Can you include some specs? Since you are using a specific switching mode power supply, the max current handling should be published. But if your power supply sources current through the buck converters, maybe it is limited? </p><p>I like your project though. Good job. </p>
<p>&gt;Output of the boost converter depends upon the input provided by SMPS.</p><p>&gt;The maximum output ratings of LM2596 is 1.1-30 Volts 3 Amps.</p><p>&gt;If your SMPS is rated at 32 Volts 6 Amps - then each buck converter can provide 1.1-30 Volts 3 Amps as output.</p>
<p>Looks good, but what kind of specs (voltage/current) does it have? </p>
<p>&gt;Output of the boost converter depends upon the input provided by SMPS. </p><p>&gt;The maximum output ratings of LM2596 is 1.1-30 Volts 3 Amps.</p><p>&gt;If your SMPS is rated at 32 Volts 6 Amps - then each buck converter can provide 1.1-30 Volts 3 Amps as output.</p>
<p>Link is working for me, but in any case I have also attached (Circuit Diagram + PCB layout + Hex Code) for the dual multimeter.</p>
<p>Anyone wondering what that .Lay file is, it's a PCB fabrication file. I downloaded a free reader by Abacom for their Sprint-Layout software so I could view it. Found here: http://www.abacom-online.de/uk/html/sprint-layout.html all the way at the bottom. You can print from it so making the PCB shouldn't be a problem. I'm not sure if there are other PCB Design software packages that read .lay files... </p>
<p>We need a schematic. Thank you.</p>
<p>Pls. schematics, almost circuit wiring!!!</p>
Where can I get the SMPS?
<p>ebayyyy</p>
<p>How about a circuit diagramme?</p><p>Thankyou in advance</p>
<p>Nice job! I'd like to build one of these, but the links to the other projects don't seem to be working?</p>
<p>Thanks, Very awesome BPS </p><p>thanks for sharing I may build it but not now I have final exams to study for :\ </p>
<p>Thanks for sharing this!</p>

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