Sound output voltage

[marinero]

Hi


I heard how great the pandora audio is so I'm thinking about using my future pandora on a audio application. I need to know the output voltage of the jack output to see if i need to preamplify it.


If I don't want to use the built in speakers, can I use this audio line? is it more powerful?

 

[TrashyMG]

Hitched my Pandora up to my Oscilloscope through the headphone jack.. Audio to volume to full... I ran a 1khz tone wave file.. I'm seeing a peak AC voltage of +/- 1.3V, so 2.6 Volts Peak to Peak.. It's late here and I'm a little rusty on my Math to calculate the True RMS voltage. I know the approximation for RMS voltage is .707 X Peak AC voltage.. so ~0.92 volts...


Now I'm not sure if this wave file is driving the amp to it's fullest.. but it's better than nothing.


Edit: plus I needed an excuse to use my Oscilloscope.

 

[MWeston]

The maximum output is 4.1Vpp if I remember correctly. I set the gain so that you can just slightly clip the output if you were to put a 0dB sine wave through it or something like that. TrashyMG's readings are more realistic values for anything audio but 4.1Vpp is the spec.

 

[Linux-SWAT]

Picking up the sound through the ext connector is the shortest path to the soundchip therefore the less parasited ?

 

[MWeston]

The EXT connector is line level so about 1.8Vpp. It is a line driver output so it should handle a decent amount of load but it is no headphone output.

 

[marinero]

So the conclusion is that the headphone jack is better than the ext line to connect a amplifier directly without preamp


I suppose that I can get the ext line with video out cable

 

[Linux-SWAT]

It depends of the cable. Waiting for the mass production ones, they are currently hand-made by some members of the community, so they have not all RCA/cinch outputs/inputs.


In my opinion, for the best audio rendering/recording, you should use shortest as possible RCA/cinch ext cables, then preamplify. Mini-jack sucks for audio.

 

[gotwake424]

I drove my portable amp from the mini-usb which worked fine for me


Pandora + Ibasso d4 + sennheiser 558= amazing

 

[marinero]

Is the mass production cable going to happen anytime soon?


Can I configure the outputs?, for example play something through the ext line and other song through the headphone output. the same? only one line at a time?


the Ibasso d4 is a good idea because it has a gain switch