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What are the voltage level (pk to pk, both average and the maximum voltage output) of a music player from Samsung mobile phones, Apple iPods, iPhones etc. I dont have a multimeter here and those devices above. I cannot find on the internet the device specifications that list those voltage levels. Ill be designing an audio preamplifier and so we need these data to aid in dc biasing calculations.

If have oscilloscope, that would be better and a graph for it

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closed as not a real question by Anindo Ghosh, Leon Heller, Nick Alexeev, Dave Tweed, Brian Carlton Nov 26 '12 at 19:11

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

Across what headphone impedance? – Anindo Ghosh Nov 24 '12 at 11:47
I'm plugging the mobile phone to a pre amplifier. – WantIt Nov 24 '12 at 11:49
I guess I need to know the voltage levels of a mobile phone before designing a prwamplifier right??? – WantIt Nov 24 '12 at 11:50
If you're plugging in a signal that is capable of driving headphones, why do you need a preamplifier? What, by your understanding, is a preamplifier? – Anindo Ghosh Nov 24 '12 at 11:51
A preamplfier is a device that amplifies the small signal from mobile phones typically around 300 mv to around 5 or more volts and it passes the amplified signal to power amplifier for driving large speakers – WantIt Nov 24 '12 at 11:59
up vote 1 down vote accepted

This blog post may help you out some. It states that the output voltage from an iPhone is about 0.95 Vrms.

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