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)
>Dremel and cutting disk
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.