Build a Simple Power Supply

Today I’ll show you how to convert an old notebook computer power adapter into a useful variable power supply for your workbench. This is a great project for beginners and experts alike!

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Today we will build a useful bench power supply that thas both a fixed (5-volt) output and a variable 0 -17-volt output. Its a useful addition to any workbench, and it’s safe and easy to build.

We’ll repurpose a common netbook power adapter, there are thousands of these lying around from computers that have seen better days. They commonly have a 19-volt output, with decent current capabilities.

The design is further simplified by using some buck converter modules, one for a fixed output and one with a variable output and a digital display. The convertor I used even has a memory feature, allowing you to store and recall multiple output voltages. It was easily available on Amazon.

This is really easy to build, so even if you are just getting started its a great project. And as all the nasty high-voltages are safely tucked away in the power brick you don’t need to worry about shocking yourself.

Here is what we will be covering today:

Power Supply Design & Components – 5:56
Wiring Diagram – 6:42
Getting all the parts together – 7:54
Testing the Modules – 11:44
Building the Power Supply – 16:15
Testing the Power Supply – 21:16

I didn’t have time to paint or label the case but even so, this build looks pretty good, thanks to the “DROK 180081 Numerical Control Step Down Voltage Regulator” that forms the heart of the design. I picked mine up on Amazon, along with the “LM2596 DC to DC Buck Converter” modules used for the fixed output.

You don’t have to build the exact power supply I did, you can use this technique for repurposing old power adapters to create all sorts of custom power supplies. Just make sure to observe the current rating and the polarity of the supply output.

You’ll find an article accompanying this video on the DroneBot Workshop website at https://dbot.ws/easypower. Between it and the video, you should have no trouble safely assembling this useful addition to your workbench.

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