Know About dc power supply kit

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Mace asked How does this dc power supply work after its assembled?

I need a fan for my new little soldering workshop. I plan to use a computer fan in a way that I can plug it into an outlet. Pc fans use dc so I need a converter, I thought buying one I assemble would be great especially if I can adjust the voltage/fan speed. I'm confused how this one will work. I guess the resistors soldered in adjust the voltage so its actually more fixed than variable, then I could solder in my fan instead of that LED light, but then how is it powered? Does it plug in or do you need a 9v battery. I've never done these kind of things before if someone has a different, better kit for under $20 feel free to link it here.

And got the following answer:

Yes you are right to use a wall outlet as a power supply and avoid mains issues. These provide 12V etc., AC or DC or regulated DC, depending on the type. If you have an external regulator, it needs several volts higher at the input than the output voltage (known as the dropout voltage). Thus 15V DC to produce 12V DC and adjustable downwards. The current requirement is "more than the fan draws". Look up devices like LM317 for an adjustable regulator. Find the data sheet, which will give you heaps of info. It means externally adjustable, instead of internally fixed voltage. You could replace one of the adjustment resistors (the one to ground common) with a variable resistor (potentiometer) and a fixed resistor for a minimum value. These regulators may need a heatsink. You will need to know the voltage and current rating of your fan. It is probably something like 12V and 200 to 300mA. It may only work between some range like 9 and 12V though. Look up the internet there is quite a lot about these, not always accurate.


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