Headphone audio-2 sources-auto select switch

Thread Starter

Napoleon

Joined Dec 21, 2008
47
Hello everyone!

I have a little issue that I'm hoping you guys can help solve.

I use headphones to listen to music from my phone.

I would like to come up with some sort of automatic switching device that will allow me to use the phone and handheld radio with the one pair of headphones.

Basically, I will be listening to music, and when the handheld receives audio, the switch will disconnect the phone, and connect the handheld to the headphones.

That way I can be listening to music, and still be able to monitor/listen incoming audio on the handheld radio.

So, basically 2 sources of audio, one output (headphones).
Switch selects the music source as priority, and only switches to handheld audio when there is audio there.

Notes:
Perhaps the power for the switch can be obtained from the microphone jack of the handheld radio. I think it has a few volts on one of the pins of that jack.

It is a regular Midland brand LXT440 model.

Thanks for the help!!
 

mik3

Joined Feb 4, 2008
4,846
If you want this to happen automatically, use a comparator to detect which channel starts to play music and then use an analog multiplexer IC to choose which channel will feed the headphones.
 

mik3

Joined Feb 4, 2008
4,846
Yes, it looks good for what you need. If you look at page 8 you will see a diagram of what you want to do. I have never used such IC so I don't know if they exist in DIP packages. Search more.:)
 

Thread Starter

Napoleon

Joined Dec 21, 2008
47
Yes, it looks good for what you need. If you look at page 8 you will see a diagram of what you want to do. I have never used such IC so I don't know if they exist in DIP packages. Search more.:)
Yeah, I saw page 8.
I referenced it in my post above, with the PDF link.

The comparator would be wired a little different I guess.
Instead of a mute switch, its output would be used to control the switch, and the input would be the audio source from the handheld radio.

I think...

:confused:
 
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