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!
Headphone Voltage?
- Kalium_Puceon
- Posts: 492
- Joined: Sun Oct 14, 2012 2:53 am
- Gender: Other
- Sexual preference: Bi
- Species: Duiker!
- Region: Western Cape
- Location: Heck Avenue
- Mastodon: pleroma.site/kalium
- Contact:
Headphone Voltage?
"You never get over the desire to do stupid things. You simply have to overrule your stupid urges with an acquired sense of fear."
-Dr. Richard Weisiger
Contact Me!
My Github! | My Twitter! | My Tumblr | Hit me up as Kalium on foonetic IRC!
-Dr. Richard Weisiger
Contact Me!
My Github! | My Twitter! | My Tumblr | Hit me up as Kalium on foonetic IRC!
- Franky
- The Bad Guy
- Posts: 1748
- Joined: Tue Jan 01, 2013 12:32 am
- Gender: Male
- Sexual preference: Straight
- Species: Mortally Challenged Fox
- Region: Gauteng
- Location: Where bad things happen.
- Contact:
Re: Headphone Voltage?
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.
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.
- Adagio
- Warm Hearted
- Posts: 3609
- Joined: Tue Feb 07, 2012 7:06 am
- Gender: Male
- Sexual preference: Other
- Species: Snow Leopard
- Region: Gauteng
- Location: Pretoria
Re: Headphone Voltage?
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...
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...
- Attachments
-
- IMAG001.jpg (60.09 KiB) Viewed 943 times
-
- Posts: 1616
- Joined: Wed Nov 18, 2015 9:15 am
- Species: Funambulus palmarum (Squirrel)
- Region: Gauteng
Re: Headphone Voltage?
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.