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What Type Of Resistor Is Needed?

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lettuce:

What type of resistor will i need if i want to get a 12v current down to a 5v? I want to connect my credit board up to my I-PAC, but the credit requires a 12v supply, so i need to add a resistor to the wire that is connected to the I-PAC and the pulse input on the Credit Board, to get the 12v down to a 5v so it doesnt fry the I-PAC

Angry_Radish:

I'd use a voltage regulator, not a resistor.
They are quite cheap at radioshack and other electronics stores.
 :cheers:

BobA:

You need to invert the signal as well as isolate 12V from 5V.  The ipac needs a ground to indicate a contact closure.

Use an NPN transistor and a 1000 ohm 1/4 watt resistor to make the following.



lettuce:

I only have a very basic skill in wiring and soldering. Can you use simpleton terms by any chance?

Angry_Radish:

Doh, missed the pulse bit, tnx  :cheers:


--- Quote from: BobA on July 15, 2007, 09:54:49 am ---You need to invert the signal as well as isolate 12V from 5V.  The ipac needs a ground to indicate a contact closure.

Use an NPN transistor and a 1000 ohm 1/4 watt resistor to make the following.



--- End quote ---


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