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| rdagger:
Does anyone know of any step-up circuits to boost a computer power supply output to 24V? |
| 2600:
How much current do you need? Is there any reason you can't get a 24V power supply? |
| rdagger:
--- Quote from: 2600 on June 21, 2006, 01:15:31 pm ---How much current do you need? Is there any reason you can't get a 24V power supply? --- End quote --- I not sure on the amps but probably about 1A to control a 24V solenoid. I could buy a 24V p/s but I am trying to conserve space and I already have a slim external drive p/s that provides 5V (which I'm using for another circuit) and 12V. |
| MonMotha:
1A would be pushing it, but you can grab 24V off of a computer PSU between the +12 and -12V rails. Just be careful because the low side is no longer the same as the power common (ground). Some computer PSUs don't really enjoy this as their topology tends to make them want everything returned via common, but many don't mind. Check the current limit on your -12 rail (usually written on the side of the power supply). Otherwise, you can get 2x charge pumps that'll double the 12V rail up to 24, but they're usually not good to a full amp, so you'd probably need to go with a boost switching power supply and run it off either your 5 or 12V rail. I know I've seen them integrated onto prebuilt modules (they're also available as pretty much single chip + inductor + capacitor), as well. |
| ShinAce:
If you have another spare 12 volt supply, you can daisy chain them to make 24 volts. + from one supply to - of the other, the remaining terminals yield 24 volts. |
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