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Electronics => Electronics => Topic started by: airman00 on March 15, 2008, 08:33:12 PM

Title: Headphone hacking
Post by: airman00 on March 15, 2008, 08:33:12 PM

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? 

Title: Re: Headphone hacking
Post by: karlis on March 16, 2008, 08:07:58 AM

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

Title: Re: Headphone hacking
Post by: airman00 on March 16, 2008, 08:21:02 AM

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

Title: Re: Headphone hacking
Post by: izua on March 16, 2008, 08:49:10 AM

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

Title: Re: Headphone hacking
Post by: airman00 on March 16, 2008, 08:59:51 AM

Quote from: izua on March 16, 2008, 08:49:10 AM

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?

Title: Re: Headphone hacking
Post by: karlis on March 16, 2008, 10:45:16 AM

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

Title: Re: Headphone hacking
Post by: airman00 on March 16, 2008, 01:50:11 PM

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

Title: Re: Headphone hacking
Post by: ed1380 on March 16, 2008, 02:40:58 PM

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

Title: Re: Headphone hacking
Post by: airman00 on March 16, 2008, 06:02:17 PM

Quote from: ed1380 on March 16, 2008, 02:40:58 PM

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