Duration: 12M 30S Likes: 140 DisLikes: 5 Rating: 9.66 / 10
Views: 26038 Description: How to wire and test a common 12V switching power supply, suitable for 110V / 220V AC.
I've been using a car battery charger as a desktop power supply for various different projects. The battery charger has a 'brain' that senses the voltage and current draw of whatever it's connected to and tries to adjust based on that. Because of that, it makes a pretty poor desktop power supply and has no user adjustable output.
I bought this regulated switch mode power supply for 999 peso (22 USD). Although I've since seen people selling them for around 750 PHP (16 USD).
I'm feeding live and neutral AC into the power supply (2 pin plug with crimped connectors) and taking the DC out to crocodile clips.
The output DC voltage can be adjusted from 9.8 volts to 14.6 volts. I assume the reason it goes to 14.6 volts is because that's very close to the voltage you'd want to use for charging a 12V lead acid battery (14.4V).
This box is not designed to be a desktop power supply due to potentially exposed AC . It's more suited and safer to use it in a permanent install; for example in a loft or inside an electrical box.
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