Required Resistance? - Electronic Circuits Projects Diagrams Free

niss · 30th September 2003, 05:01 AM

Does any one know the amperage of a parallel port on an average PC? I am trying to figure out the resistance required to make it equal 0V. so i can avoid constantly triggering my Transistor. Any Help is appretiated. Thanx.

crust · 5th October 2003, 09:08 PM

Not sure that I really understand your request, but the PC reference manual indicates that a parallel port pin should be capable of sourcing 2.6mA and sinking 24mA. Perhaps if you include a simple drawing we can be of more assistance.

mysemcon2000 · 15th October 2003, 02:30 PM

Hi,

The current your parallel port will sink or source will eb dependent on the amount of load you have. I=V/R not V=I/R. Current is a FUNCTION of voltage. If the parallel port is trigerring your transistors even it is in its low state, probably you're transistor is not biased properly and check if your PC and circuit has the reference point or ground level.

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30th September 2003, 05:01 AM	#1
niss	Required Resistance? Does any one know the amperage of a parallel port on an average PC? I am trying to figure out the resistance required to make it equal 0V. so i can avoid constantly triggering my Transistor. Any Help is appretiated. Thanx. __________________ Hey A Capacitor.....ZAP!!!

5th October 2003, 09:08 PM	#2
crust	Not sure that I really understand your request, but the PC reference manual indicates that a parallel port pin should be capable of sourcing 2.6mA and sinking 24mA. Perhaps if you include a simple drawing we can be of more assistance.

15th October 2003, 02:30 PM	#3
mysemcon2000	Hi, The current your parallel port will sink or source will eb dependent on the amount of load you have. I=V/R not V=I/R. Current is a FUNCTION of voltage. If the parallel port is trigerring your transistors even it is in its low state, probably you're transistor is not biased properly and check if your PC and circuit has the reference point or ground level.