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  • DIY Bench Power Supply With Old Computer SMPS

    It is good to see how compact you can make this. One comment though. You NEED to load the main regulating output, even if you're not attaching any load to the supply. Most of the time it is the 3.3V or 5V output that is resopnsible for the regulation loop internally. Depending on the design of the power supply, that constant load should be around 1 to 3 amps, so on the 3.3V output, you should shunt this with a resistor of some 1.5 ohm, but with a rating of 10...20 watt!!. Beware, it gets really hot and you could put it against a metal plate to cool. Only then you will have a warranted 3.3V, 5V and 12V output. If you don't do this, you'll probably blow out some circuits that you attach to the supply due to poor regulation behaviour of the power supply in transient conditions.Further on, ...

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    It is good to see how compact you can make this. One comment though. You NEED to load the main regulating output, even if you're not attaching any load to the supply. Most of the time it is the 3.3V or 5V output that is resopnsible for the regulation loop internally. Depending on the design of the power supply, that constant load should be around 1 to 3 amps, so on the 3.3V output, you should shunt this with a resistor of some 1.5 ohm, but with a rating of 10...20 watt!!. Beware, it gets really hot and you could put it against a metal plate to cool. Only then you will have a warranted 3.3V, 5V and 12V output. If you don't do this, you'll probably blow out some circuits that you attach to the supply due to poor regulation behaviour of the power supply in transient conditions.Further on, BE SAFE!, these supplies are designed for internal use. They have large openings that give access to high voltage parts. Putting it on a desktop without further protection can be dangerous for electrocution if you have wires and components lying around on your desk.

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