what do i need for a curit to convert 10.5v to 9v

z4g · Post by **z4g** » Fri Apr 20, 2007 5:41 pm

trying to connect a ntl/virgin/cable modem to the psu on a pc for a friend just want to find out what resisters i need to convert the power for it

johnbjuice · Post by **johnbjuice** » Fri Apr 20, 2007 6:45 pm

1. Put the speedtest pic in your sig, so it doesn't stretch the forum.

2. For maximum efficiency, use a DC-DC converter. I'm not sure exactly what resistors you'll need - depends on which DC-DC converter you use.

z4g · Post by **z4g** » Fri Apr 20, 2007 7:48 pm

first of all sorry about that second how do i find them out?

Jongamer · Post by **Jongamer** » Fri Apr 20, 2007 7:56 pm

7809 would work too.

timmeh87 · Post by **timmeh87** » Fri Apr 20, 2007 9:00 pm

so you are connecting it to the power supply in the computer?

where did you get 10.5v from?

anyways. the router probably has its own 7805. it would probably do fine with 10.5v or more. when you are dealing with AC wall adapters you need to account for a lot of error.