ZA Furries

Hey, guys!

I was thinking about making a radio frequency synthesizer using one of the IR LED's I have lying around and a Cellphone audio frequency generator, with the power for the LED coming from the Headphone Jack. I was wondering If any of you guys could tell me roughly how many volts a headphone jack plugged into a cellphone or tablet outputs at full volume.

Thanks for any help!

Changing signal is changing.

Line outputs normally gives out -10DBV constant sine like signal but headphone jacks differ a bit.
It's not that easy but should be between the ranges of 0.2V to 0.6V per channel or 30mw. For the transistors and caps to receive signal you'll see a something like a 10V spike but then lowering down to the Millivolt range again. Headphones also comes in a variety of resistances can go from 16ohm to 32ohm for low independence to the ranges of 100 - 600 ohm for high independence.

Well... He has a lot more intemate knowlage of audio signals.
But I have all the toys!

Here is a oscilloscope readout of all the value's of a 1KHz wave from a cellphone, at full volume.

P-P Voltage: 416mV
Vmax= (vP-P/2) = 208mV
rms= vMAX/sqr(2) = 136mV

I guess I'm a little late thow...

If you go over to avforums.co.za (same handle as here) you will see my design process for a headphone amplifier which gives all the calcs and voltages involved.