Atx Bench Power Supply Load Resistor

It is used to provide a small load to keep the power supply in the on mode. In order to get the psu to think it is connected to a computer you have to connect a dummy load resistor to one of the power rails to fool it into thinking it is connected to a computer. First a bit of background on a typical atx power supply.

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However you could have one laying around in the form of an atx psu power supply unit.

Atx bench power supply load resistor. And that is the dummy load. Since all the power supplies are different it s hard to be precise but aim for at least 1a on the 5v and 500ma on the 12v. One with a higher wattage.

Then you will know how big a resistor to use e g. Convert an atx computer supply to a bench power supplyin your video you show a 50w 8rj power resistor but in the parts list 8 20 ohm 10w power resistor which one is correct. I ve not looked at any modern atx power supplies recently but have noticed inbuilt load resistors on other smps.

A good power supply is very useful when working with electronics but it can be pricey. Variable atx bench powersupply fablab edition. There are a number of ways to convert a standard computer atx power supply unit into a usable bench top power supply.

I understand all of it except one thing that noone describes fairly well. The dummy load usually is put on the wire with most power. It is connected to the other led through a resistor.

You can keep the 20 pin molex connector attached and connect directly into it or cut it off completely and group together the individual wires keeping the same colours together reds to reds blacks to blacks etc. The power ok signal goes high 5v when the power supply has settled down after startup and all voltages are in their proper ranges. There is also a 10 ohm 10 watt power resistor between 5v and ground.

I have tried 10w but with no success. I am planning on converting an atx psu into a lab bench power supply and i ve seen plenty of videos and read numerous articles about how easy it is. They are the most commonly used power supplies for computers.

This is because an atx psu is a switched mode power supply which requires a load for it to function. Computer power supplies are switch mode power supplies smps which use high frequency switching circuit elements to provide a high quality output voltage with good energy efficiency one side effect of this technology is the minimum load requirement that each power supply has.

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