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xHoly-Divinity
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 Posted: Tue Aug 05, 2008 8:34 am Post subject: Voltage of CPU parallelport |
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| Anyone happen to know how much voltage a typical PC can provide from its parallelport... sadly I do not have a working voltmeter =( |
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apomb
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| Posted: Tue Aug 05, 2008 8:35 am Post subject: RE:Voltage of CPU parallelport |
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| up to 5 volts |
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Insectoid
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| Posted: Tue Aug 05, 2008 8:53 am Post subject: RE:Voltage of CPU parallelport |
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| I believe that everything in the computer (except lights if you have a clear lit case) runs on 5 volts or less. I know there isn't enough to run 2 LEDs in the same output, at least. |
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Zeroth
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| Posted: Tue Aug 05, 2008 8:57 am Post subject: Re: Voltage of CPU parallelport |
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| Apomb's right, about 5 volts. However, it depends on which pin, since most of them are signal inputs. If you want consistent voltage without worrying about any software negotiation or chips needed, look at usb pin-outs. And google that term there for better information. |
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md
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| Posted: Tue Aug 05, 2008 8:31 pm Post subject: RE:Voltage of CPU parallelport |
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| it's the current you can source/sync that matters much more then the voltage (which is 5v). Most parallel ports will do ~10mA tops. |
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