what's the iPhone 3.5 mm output jack power supply output?
Hey - I am trying to understand what's the power (watt) that the iPhone 4s (or iphone 4) can push from the 3.5mm output jack...
I THINK it's voltage output is 1.5v (I would be happy to get confirmation on that) , but I have no idea about the power it can drive..
The audio jack is actually a 4-pin connector. The additional pin is for the mic input.
1 Tip Left audio
2 Ring Right audio
3 Ring Common/Ground
4 Sleeve Microphone
Since the iPods have some 60mw output (30mw per channel) I would put the iPhone into that range.
Here is some other audio data comparisons:
Frequency Response iPad2; iPhone4; iPod classic 6th;
(from 40 Hz to 15 kHz), dB: +0.04, -0.55 ; +0.02, -0.16; +0.03, -0.18;
Noise level, dB (A): -90.3; -90.2 ; -90.2;
Dynamic range, dB (A): 90.2; 90.2; 90.2;
THD, %: 0.0045; 0.0068; 0.0049;
IMD + Noise, %: 0.0098; 0.012; 0.010;
Stereo crosstalk, dB: -49.2; -72.4; -67.5;
The headphone jack on an iPhone 4S does not supply power.
It has 3 contacts. It supplies left/right audio and a control signal
and has a ground.
It does not supply power in the "power supply" sense of the term.
One cannot power other equipment from the headphone jack.
It does supply a certain amount of power - audio power - measured
in milliwatts, I believe. But that cannot be used to power another mp3 player
(for instance) with operating power. But the audio signal can and will
drive an amplifier that gets it's own operating power from it's own
internal power supply.
" The HiJack energy harvester can supply 7.4 mW to a load with 47% power conversion efficiency when driven by a 22 kHz tone from the output from a single audio channel on the iPhone 3GS headset port"
So tell me how the headphone jack on iPhones can't supply power? The question wasn't "can the headphone jack power a mp3 player".