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xHoly-Divinity

Tue Aug 05, 2008 8:34 am


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

Tue Aug 05, 2008 8:35 am


RE:Voltage of CPU parallelport

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up to 5 volts


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Insectoid

Tue Aug 05, 2008 8:53 am


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

Tue Aug 05, 2008 8:57 am


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

Tue Aug 05, 2008 8:31 pm


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.