2 aux devices, 1 aux input

**McGinty** · 07-12-2005, 04:53 AM

hey guys

i have an xbox in my car that plays music through the auxillary inputs on my panasonic head unit. Yesterday i got a sony nehd5 20gb mp3 player for excercise and work but i also would like to use it in the car.

I know the easy way is an fm transmitter, but fm is ****ty. Therefore i need to take 2 aux sets and get them into one. I know there are lots of those little selector boxes, but that may look kinda ghetto, so finally my question comes to this:
is there any possible circuit (my electronics raent that great) that could let me choose between which device gets played.

im open to any designs, i have a few of my own, but yeah
help

cheers boys

**KyleYankan** · 07-12-2005, 05:10 AM

there is a simple mixing circuit you can make with a few resistors. They'll just combine the signals, so oyu cna do both at once. I forget the schematic and values though.

**KyleYankan** · 07-12-2005, 05:11 AM

http://www.epanorama.net/circuits/linesum.html

**binary.h4x** · 07-12-2005, 07:25 AM

I don't think he wants to mix them, just select one to play through the aux at a time.

You can run the signals to a DPST switch and select them that way.

**dodgetimes2** · 07-12-2005, 10:12 AM

Originally Posted by binary.h4x

I don't think he wants to mix them, just select one to play through the aux at a time.

You can run the signals to a DPST switch and select them that way.

Wouldn't you want a DPDT switch.

**binary.h4x** · 07-12-2005, 11:04 AM

yeah, my bad, twas thinkin in mono :P

**McGinty** · 07-12-2005, 06:14 PM

oh okay,

so i would need 2 of these dpdt switches? one for each channel (judging by that diagram)

thx guys

**dodgetimes2** · 07-12-2005, 06:28 PM

You should be able to just use one if you connect all the negatives together (grounds). Like this. (Someone correct me if I'm wrong but I believe that you can use common grounds)