| Electronics > Beginners |
| ATX conversion question |
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| shobo:
i'm planning to do an ATX conversion to make myself the most basic of bench power supply. The plan is to get a 24 pin extender to breakout the wires and keep the psu untouched. Since the PSU is a really cheap and i doubt it has multiple rails can the power resistor could be added with an adapter to one of the sata cables with an adapter? The resistor i plan to add is a 10w to the 5v line. |
| madires:
Maybe a better option: |
| cdev:
Those supplies still need a source of voltage to regulate, so teaming up an ATX supply with one of them makes sense. An ATX supply with give you a bunch of fixed voltages and currents and could be teamed up with one of the DC-DC converter modules to give you a single output with controlled current for prototyping. That's a good all around solution for a bench. |
| rstofer:
I'm not sure why you are using the resistor... Here is a neat way to set up the ATX supply: https://www.sparkfun.com/products/12867 Notice that the gadget has fuses. This is important because the ATX has far more current capability than you want to have in a bench supply. The magic smoke comes out of chips really quick when the power supply doesn't limit the current in any meaningful way. |
| phil from seattle:
The resistor is there because most (all?) PC power supplies need a minimum load to start. I agree that current limiting is very important, not just with a beast supply. My dual channel, no-name Chinese bench supply has decent current limiting and I will set it to usually about 2X my max expectation. Saved my @$$ multiple times. |
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