What is the output voltage of the earphone conector?

iLeeo wrote:

Hello, i would like to know what is the output voltage of the iphone 5s earphone conector.

Here is a reasonably complete specification for the audio out (headphone jack)

The traces are color coded for the Left Channel and for the Right Channel. When they don't lie on top of each other, it's due to channel imbalance.

I loaded the CBS CD-1 standard test CD into iTunes as ALC files, synced my iPhone 5 via iTunes 10, and then played-out from the iPhone 5's standard Music app at maximum gain (volume) under battery power.

Output Voltage

Output Source Impedance

4.5 Ω.

Output Noise Levels

-106.8 dBV, A-weighted, playing zeroes (silence).

-116 dBV, A-weighted, idle.

Frequency Response

iPhone 5 Frequency Response, 200 kΩ load, 1 V RMS output.

As expected, the iPhone 5's response is ruler-flat.

Let's expand the scale and look more closely:

iPhone 5 Frequency Response, 200 kΩ load, 1 V RMS output, expanded scale.

Not bad; down only 0.01 dB at 20 Hz and -0.08 dB at 20 kHz, flatter than most labs can measure.

Let's plug in a headphone and see what happens:

iPhone 5 Frequency Response, driving Ultrasone Edition 8 (32Ω).

The near-zero (4.5 Ω) output impedance of the iPhone 5 is much better (lower) than most dedicated headphone amplifiers, even most exotic audiophile amps, and therefore its response is not significantly affected by the headphones in use. Most dedicated amplifiers have about ten times the output impedance of the iPhone 5, and allow about a dB or two of false bass boost with the Ultrasone Edition 8. With the iPhone 5, the sound is accurate and well controlled.

Click here for full test results.

No problem with your english. It's better than many who's only language is english. As for what you are asking I've never seen any published data. It's meant for earphones so whatever that standard is. Are you wondering about using headphones that need amps?

I don't know the voltage, but I know that headphone jacks in general are often used to provide an audio feed to a "Line In' jack on a pc or other device for recording. (Don't use a "Mic" jack to "Line In".) I have a cassette/CD player and I take the feed out of the headphone jack into the "Line IN" on the back of my pc for recording from the player. It works well...

iLeeo wrote:

hahaah thanks. But i want to turn on a speaker with the output energy of the earphone connector, or with the lightning conector (charge connector).

thanks

That won't work, you will need speakers with amplifiers built-in.

.

I think you misunderstood me.. a sound wave has to be an AC signal as it has positive and negative portions (not DC)

so it should output an AC signal out of the headphone jack - hence my question.

in which case you need to calculate the peak and RMS (root mean squared)

Sorry, but that's beyond what little knowledge I have about such things. Hopefully someone comes along that can give you the information you seek.

It is headphone level output -10dBV (or not much more than .447 vDC or ) at 32 ohms impedance.

The only speakers that will work with the output from a headphone jack (without any further amplification) are the little speakers inside your headphones.

when you say its ~0.5 vDC.. surely it can't be a DC signal as its audio?

aswspry wrote:

when you say its ~0.5 vDC.. surely it can't be a DC signal as its audio?

It’s a voltage.

You cannot send audio over a wire. You have to convert it to a voltage.

Why don't you just read the last post in this thread from Csound1?