Ever noticed how many unused computer power supplies end up gathering dust? Believe it or not, you can turn one into a powerful and adjustable DIY power supply for your workbench—no expensive gear needed.

Why Build Your Own DIY Power Supply?

If you tinker with circuits or repair gadgets, having a reliable bench power supply is essential. But commercial units can be pricey and might offer more features than you actually need. Repurposing an SMPS (Switched-Mode Power Supply) gives you:

• A customizable voltage and current source for projects
• Cost savings by reusing parts you already have
• A fun weekend project that teaches practical electronics

Plus, it’s satisfying knowing you built something useful from what would otherwise be e-waste.

Parts Used in This DIY Power Supply Build

For this project, the main components are:

• SMPS (Switched-Mode Power Supply) — 24V, 360W model salvaged from unused equipment
• Step-down (Buck) Converter Module: XY 6509X — lets you adjust voltage & current output
• Basic connectors & wires — for input/output connections
• Enclosure (optional) — to keep things tidy and safe

The XY 6509X is a popular module known for its compact form and simple controls. If you want more info on this step-down module, check out the manufacturer’s product page. As for the SMPS, most generic 24V 360W models follow a similar layout—just make sure yours is in good working order.

How to Build the DIY Power Supply

Here’s a step-by-step overview of what’s involved in making your own bench power supply:

• Double-check the SMPS is working and outputs a stable 24V DC.
• Wire the output terminals of the SMPS to the input of the XY 6509X module (pay attention to polarity).
• Connect output wires and banana plugs or binding posts for easy access.
• If desired, mount everything inside a suitable enclosure for safety and neatness.
• Use the adjustment knobs on the XY 6509X to set your desired voltage and current limits.

Safety tip: Always check your wiring before plugging into mains power. If unsure, ask someone experienced or consult a guide like the one on Electronics Notes.

Real-World Experience and Tips

A friend of mine once needed a variable supply for testing microcontroller boards. Instead of buying a new unit, he dug out an old PC power supply and paired it with an inexpensive buck converter. He was amazed by how easy it was to get stable, adjustable output perfect for his needs. The best part? All it took was a bit of soldering and some careful wiring.

If video tutorials help you learn faster, there’s a straightforward walkthrough available on the Kvolt YouTube channel. It’s always helpful to see the actual wiring and adjustments in action.

Why Use the XY 6509X Step-Down Module?

The XY 6509X module is handy because it offers:

• Wide voltage adjustment (works well with 24V input)
• Easy-to-read display for voltage/current
• Built-in short circuit protection

With these features, it makes adapting an SMPS for lab use much simpler than trying to modify the supply directly.

Final Thoughts

Turning an old SMPS into a DIY power supply is one of those practical projects that pays off every time you use it. You get a reliable bench tool without breaking the bank—and save some electronics from the landfill in the process.

What projects would you try if you had your own custom power supply at your fingertips?