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12v to 6v for Sat. radio?


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carguy411 
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Posted: November 26, 2004 at 3:07 PM / IP Logged  
the new add on satelite radios use a cig. plug that dropst the voltage from 12v-6v. now if i wanted to hard wire this to the car how can i drop the voltage saftely and easily
thanks
brianrwebb 
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Posted: November 26, 2004 at 10:45 PM / IP Logged  

if you are asking,

'how do i hard-wire the cig lighter adaptor to the car's acc power wire in the dash, without the actually cig lighter jack being there?,'

then that's simple. i know many will suggest a female cig lighter receptical to accept the male cig lighter, but just forget it and get out the solder gun. go to radio shack and buy a fuse holder made to hold the type of fuse that is already existing in the cig lighter's tip:

http://www.radioshack.com/product.asp?catalog%5Fname=CTLG&category%5Fname=CTLG%5F011%5F004%5F004%5F000&product%5fid=270%2D1238

as the fuse should be or is a 5x20mm 1amp(1000mAh) 250V fuse, and solder the postive fuse lead to the board along with a black negative lead to the ground on the board, reassemble the adapter and slide it behind the dash, take you 10minutes tops.

this is for XM i'm guessing, as the Sirrius add-on radios feed and run off of 12V, while the XM's are 6V.

of course, this is assuming you have the cig lighter that came with your car adaptor kit, you were somewhat vague in the explanation. 

i'm thinking maybe you're asking, 'how do i create a board to drop the voltage from 12V to 6V without the aid of the original car adaptor?'

anyone out there agree, disagree, i hate the idea of having a huge cig lighter male adaptor/female receptical behind the dash, seems cheesy.

dxav 
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Posted: November 29, 2004 at 12:15 PM / IP Logged  
Inside that lighter plug is either a voltage regulator (IC) or a voltage divider (2 Resistors). You will need to imitate that circuit to be able to hardwire it to the vehicle. Very easy to do, may be a little tedious w/o prior DC electrical experience.
DXAV
carguy411 
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Posted: December 09, 2004 at 6:32 PM / IP Logged  
im doind sirius but i also did XM with that cig. plug and i like that idea of just taking it apart and resoding right on the board seems like the obvious and easiest way to do it. i was thinking of this whole complex thing to do.i guess thats y people always say Keep It Simple Stupid!!!
thanks guys
brianrwebb 
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Posted: December 09, 2004 at 9:29 PM / IP Logged  

here's what the thing should look like finished, after the leads are soldered and the in-line fuse holder is attached. this is an XM 12-6V cig lighter adaptor.

12v to 6v for Sat. radio? -- posted image.

carguy411 
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Posted: December 09, 2004 at 11:59 PM / IP Logged  
kool thats looks like the way to go
the only question is it that easy to identify which one in the pos and neg when i open it and solder the new one to the board
thanks for the pic
brianrwebb 
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Posted: December 10, 2004 at 7:30 PM / IP Logged  

sure thing, it's easy to identify the positive and negative terminals on the board. the positive is where the fuse lead wire is soldered, and the negative ground is where the side pinch spring is soldered to.

when you disassemble the thing, unscrew the cap and set aside. pull the spring and metal nipple out of the thing, they probably will just fall right out. then pull the thing apart, carefully, don't break the thing.

you'll see the fuse still clipped in place on the board to clip, pull it away. then desolder the clip from the board, this is the Positive+ that you will solder the in-line fuse holder wire to.

then desolder the black lead on the board which is attached to a bent piece of metal for tension when it is placed inside a cigarette lighter- this is the Negative -.

solder the thing together, re-assemble, thread the wires through the cap end, and screw the adaptor back together, and it will look exactly like the one i have posted here. i would post a better picture, but you are limited to a 30kb picture size, if you'd like, i could email a larger, better focused photo of the finished product against a background that is easier to view the adaptor.

let me know how it goes for you...

brianrwebb 
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Posted: December 10, 2004 at 11:26 PM / IP Logged  

here ya go, just a little better, too bad i didn't document the installation of the in-line fuse as i went on with the process.

12v to 6v for Sat. radio? -- posted image.

brianrwebb 
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Posted: December 10, 2004 at 11:31 PM / IP Logged  

hmmmmmm.........

stavy customs1 
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Posted: December 13, 2004 at 2:05 AM / IP Logged  
Buy one of those adapters that converts your cig lighter into 2 females and cut it in half. Goto the ignition or other good 12 volt source and solder that female cig lighter adaper there then plug the xm cig lighter in there and voila its hidden. Just run the wire up and thats it
Best Buy Installer
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