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View Full Version : line switch for Fm modulator



lostforawhile
12-27-2009, 12:11 AM
Well I've been trying to figure out how to make one FM modulator work for two inputs, and I didn't want to install a bulky manual switch box, So I finally came up with this idea, I had a nice heavy duty 4p DT relay from a welder in my junk, it was 24 volts so i hadn't even considered it, I was messing around with it, and the thing will operate just fine on 12 volts dc. I used it, some shielded wire I already had, took a set of audio jacks out of a dead equalizer, and all i needed was a box, I was trying to figure out where to find one, then I remembered I have about a hundred obsolete airplane strobe drivers, they come in a nice shielded aluminum box. So i gutted one , transferred the hole pattern over to it, and drilled all the holes for the jacks.
this is what I ended up with, the cover isn't on it yet. I'm running a Rosen wired modulator, i have this set up so the MP3 player is the default input, when the XM radio is turned on, it energizes the relay, and the input is switched to it. It won't have perfect sound being a modulator, but I just want it to be loud mostly. The sound will still be a lot better then an over the air one.
what the audio jacks came from, just unsoldered them
http://i220.photobucket.com/albums/dd158/lostforawhile/S4020783.jpg
the side of the case where the phone jacks stick out
http://i220.photobucket.com/albums/dd158/lostforawhile/S4020784.jpg
one of the jacks unsoldered with the relay
http://i220.photobucket.com/albums/dd158/lostforawhile/S4020785.jpg
going together
http://i220.photobucket.com/albums/dd158/lostforawhile/S4020788.jpg
how it fits in case,with top off
http://i220.photobucket.com/albums/dd158/lostforawhile/S4020792.jpg
FM modulator
http://i220.photobucket.com/albums/dd158/lostforawhile/S4020791.jpg

Civic Accord Honda
12-27-2009, 03:11 AM
is that one of the fm modulers that plug in to the antena its self? if so where did you get ive been looking for one, i have one fora cd changer but it only works when teh cd changer is playing

lostforawhile
12-27-2009, 09:16 AM
is that one of the fm modulers that plug in to the antena its self? if so where did you get ive been looking for one, i have one fora cd changer but it only works when teh cd changer is playing

they are all over ebay, here's just one http://cgi.ebay.com/FM-TRANSMITTER-FM-Stereo-Modulator_W0QQitemZ330381422677QQcmdZViewItemQQptZ LH_DefaultDomain_0?hash=item4cec447055

89T
12-27-2009, 09:31 AM
print this thread mail it to you're self, but dont open it till you need to.

start shopping company's and make some money. lol.

lostforawhile
12-27-2009, 09:40 AM
print this thread mail it to you're self, but dont open it till you need to.

start shopping company's and make some money. lol.
well you can buy these already made, but i don't have the cash to go buying one.

89T
12-27-2009, 10:05 AM
lol.. .

AccordB20A
12-27-2009, 02:55 PM
wish they made cheap fm transmitters that could broadcast for miles that would be awesome

Civic Accord Honda
12-27-2009, 03:46 PM
yay i dont need one now... i found the line in setting to switch from cd changer mode and wired an old aux cable in to the cd changers din cable.. but now i need a new aux cable cause this one has a short in it somewhere (if i wiggle it it cuts out)

2ndGenGuy
01-03-2010, 06:38 PM
wish they made cheap fm transmitters that could broadcast for miles that would be awesome

And illegal without a broadcaster's license I'm sure.