Headphone hacking

[airman00]

How much voltage does a headphone speaker get?

I want to play around with them a bit  and I want to do ADC to read the values .

Should the multimeter pick up different votlages from the speaker or would it be same voltage througout?

If it would be same voltage throughout how would I be able to get values from the headphones? 

[karlis]

i`m not quite shure but it could be ~5v more or less..

amm can i ask what u want to do with headphones ? make something like sonar ?

sorry for my bad language

[airman00]

no I just want a computer to control a microcontroller using the headphone port

[izua]

the output of a soundcard is line voltage, somewhere ~1 V, or +-0.5.
But you should check with the soundcard manufacturer's specs.

[airman00]

the output of a soundcard is line voltage, somewhere ~1 V, or +-0.5.
But you should check with the soundcard manufacturer's specs.

OK but would I get changing voltages based on the sound played?

[karlis]

i`m not realy shure but voltage should change when sounds frequence changes aka hi tones and low tones..

[airman00]

I need to be able to tell which tone( ten different tones)  is played when the computer or iPod outputs a sound or signal to the speakers ( whic hare connected to the MC)

Any ideas ,I assume PWM to soundcards are not possible , right

Please help

[ed1380]

I've heard of soundcard being used for osciliascopes. i'm guessing they can

[airman00]

I've heard of soundcard being used for osciliascopes. i'm guessing they can

yea I have one of those

but I want output not input