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Old 19th July 2015, 03:24 PM   #1
diyAudio Member
Join Date: Jul 2015
Default switching device

I need to buy or make a switching device for my car, that I can plug in a sat nav and an mp3 player that would connect to the aux input connector of the cars stereo unit.
The device would play the mp3 continously but mute it when the sat nav gave out route guidence, then when the route guidence stopped would then unmute the mp3 player, it would have to run on 12v or less. Any ideas?
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Old 19th July 2015, 04:23 PM   #2
diyAudio Member
Join Date: Nov 2005
A double pole double throw signal relay with an audio detector input connected to the navigation audio? Check Rod Elliott's signal detecting auto power-on unit for circuit ideas. A greatly simplified circuit that still works properly is possible. Many years ago there was a company that made a bunch of different low cost car audio trinkets like this. I don't doubt something like it is still available retail now, or maybe even more likely lately.

Last edited by Andrew Eckhardt; 19th July 2015 at 04:27 PM.
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