3.5mm Jack Voltage

[McBlasian]

What is the voltage output of an 3.5mm audio jack?
I need to get it to 3V (+ or - .3V). Would I use a voltage step-up regulator? If so, which one?

 

[βeta]

Are you talking about the peak voltage of the audio signal, or are you trying to just get straight voltage out?

 

[McBlasian]

I need to get a consistent 3V out, so I am trying to find a way to do so.
I don't know whether I'd need a step up regulator, or resistor/s, step down regulator, etc.


Thanks.

 

[βeta]

Standard 3.5mm jacks don't have power. What are you pulling power out of?

 

[McBlasian]

I apologise, not the jack. I meant the female part, where the jack goes into.

 

[bud]

That isn't powered either.

 

[McBlasian]

How about when music is playing? Does it fluctuate greatly?

 

[βeta]

Like crazy. You can't use it for power. What are you trying to pull power from?

 

[McBlasian]

Dang, I wanted to run a 3v green laser from it.
How would I limit the power from a USB port?

 

[βeta]

Use this guide:
Instead of a 1.87kΩ resistor, use a 2.42kΩ Resistor.

Here is the regulator.
http://www.ti.com/product/pth08080w

 

[McBlasian]

Thanks heaps.
Would you be able to quickly explain where to wire each component? I am very new to this.

On a side note, isn't that the regulator used in N64P's

 

[βeta]

Oops, meant to link to this guide:
viewtopic.php?f=33&t=7607

Your in voltage is 5v from the USB port.

 

[McBlasian]

Sorry Beta, I don't understand how to wire the regulator correctly.

All I need from the USB is the 5V and the ground, yes?
And I can ignore the other two connections.

Then from there, which wire goes straight to the regulator and which goes to the resistor then to the regulator?
Lastly, where do I connect the laser to the regulator?

Hope this makes sense.

 

[Aux]

First image in the guide Beta linked. Your 5v wire is the red one (into hole 1), and ground is the black (connected to the resistor).

 

[McBlasian]

Oh, I get it!

So the red and black wires are from the laser, yes? So how do I wire the usb to the pth08080w?

 

[Aux]

Again, first image.

5v from USB: goes to Hole 1 (red wire)

Ground from USB: Goes to resistor (black wire)

Power for your laser: Goes to Hole 3 (labeled Voltage Out)

Ground for your laser: Goes to Ground from USB

 

[McBlasian]

Thanks so much for the help! Sorry I didn't understand the diagram.

If the 'karma' feature was still around I'd definitely plus you heaps haha!

 

[McBlasian]

Beta, why should I be using that resistor instead of the 1.87k one?

 

[bud]

It would give you almost exactly 3v instead of 3.3v.