DIY LM317 Adjustable Voltage Power Supply Board Learning Kit With Case

I recently bought the LM317 Adjustable Voltage Power Supply Board from Bang Good.com. For about $12, you can't go wrong. Bang Good is a Chinese distributor based in Guangzhou, China. The shipping was cheap enough as well, although you'll be waiting up 4-5 weeks to receive it. If you're not in a rush, then it really is a cost saving. 

The Power Supply comes with an adjustable signal generator output, that provides a pulsed signal. It also comes with an onboard buzzer and a number of LED's that indicate output voltage levels. The most useful part is the single piece voltmeter. It illuminates to tell you the output voltage, which is very useful to know before you attach it to anything else. 

All the components come not populated on the board and you have to be assembled yourself. So you'll need a soldering iron and some solder. I also recommend a decent flux pen as well; it ensures a decent connection and reduces dirt. The kit comes with a detailed diagram of where to place each component. I will admit you will also need a multimeter as some of the resistors are not labelled. Unless of course, you can read the colour band markings. 

Once built, it's a solid little power supply and I have used it for many DIY projects. The output voltage ranges from 1.25V to 12V and is continuously adjustable.

As you can see in the attached photos, we see the board as it arrives, after it's built and an updated photo too. In the updated version of the board, I used a 2A, 250VAC switch on the secondary side of the transformer to enable me to turn on and off the power supply when I want, without having to unplug the device all the time. I'm not sure if you can see it fully, but I've also replaced the standard 2 pin EU plug they supply with an old UK, BS1363 plug I had lying around. I had to insert a connector block for the live and main and I connected the earth to the underside of the transformer for safety purposes. I like to add extra protection if needed. I could connect the earth to the ground on the power supply board in order to remove my floating output on the power supply, but this proves problematic with various projects. It also a potential cause of electric shock based on whatever projects I connect it to. For example, when connecting it to systems that use the floating reference to increase the voltage. By connecting the ground to Earth, I would remove the possibility of doing this.

All in all, this is a very useful product. It's small and to the point. I really like the clear perspex box they supply with it and I'm also a fan of how it screws together using T-shape cutouts. There's little else that I would add except for what I've already mentioned. Well maybe I'd increase the height of the potentiometer for adjusting the signal generator output, which is a pain to try and get at. You'll need a smaller than 4.5mm Phillips head screwdriver to get at it.

If anyone else has ever bought this and had issues with it, comment below and let me know what you think or if there's anything else you would change about it. 

If you're looking to purchase this kit, check out the following link at Bang Good.com: DIY LM317 Adjustable Votlage Power Supply