Quick Resistor Question

csurban · Post by **csurban** » Sun May 06, 2007 2:52 pm

I know resistors restrict current but I also know they can be used to reduce voltage a small bit as well. I have a power supply giving me 12.4ish volts and ample amperage powering a N64+modded PS1 Screen so... using 2ish amps I'm guessing. What ohm and watt size resistor could I use to reduce the voltage .5 to 1 volt?

Limewater · Post by **Limewater** » Sun May 06, 2007 7:39 pm

That's probably not such a great idea. You should use a voltage regulator.

The reason for this is that your N64/LCD combo does not pull a constant current in all modes of operation. The single resistor will actually cut a different amount of voltage depending on the current the N64 and LCD are drawing.

Post by **gannon** » Sun May 06, 2007 7:42 pm

You'd be better off using a highdraw diode or something for a short drop like that I think (or an LDO regulator)

timmeh87 · Post by **timmeh87** » Sun May 06, 2007 8:15 pm

yeah diode sounds like an ok idea.

why do you need less voltage

csurban · Post by **csurban** » Sun May 06, 2007 9:01 pm

12.4v is a little too much voltage for the PSOne Screen. When running off said power supply, the screen distorts quite a bit. And how would I use a diode to lower voltage? Doesnâ€™t a diode just restrict current in a specific direction?

timmeh87 · Post by **timmeh87** » Mon May 07, 2007 9:22 am

i thought anything higher than 9v was too much...

diodes drop something like 0.7v when they are 'on'