I need help with making an electrical circuit - 3V DC to 6V DC

[Absolarix]

I need help with something that's been causing me a bit of a headache lately.

I have a wireless keyboard that is not illuminated, and I'm a night owl who can't see the bloody thing while typing in the dark.
So, I pulled a bunch of LEDs out of some random useless electronics I had laying around, and figured out their voltages and what I'd need to do to illuminate this wireless keyboard.

The two LEDs I'm wanting to use are blue, from a PDP AP.2 Wireless PS3 controller.
From testing, I've discovered that one light requires 3V to be adequately lit up for being able to see the keys.
The wireless keyboard uses 2x AAA Batteries to power it, which are 1.5V each. That's 3V total, and powers a single LED. Lovely. But I need two of them. :/

This of course means that I need to have 6V going on an entirely separate circuit because piggy backing off two AAA's with two more else where in the circuit would not only cause changes in voltage in funny places, but might also fry the circuitry of the keyboard itself. And I really don't want to add an extra four AAA batteries into the tiny amount of space in the keyboard.

I mean, yes, the keyboard has enough space for all these batteries, but I would have to make an entire new bay just for these four batteries. And that would just be a pain on the aft.

So... I'd like to try and make a 3V DC to 6V DC converter/doubler/whateverthingamabob that will run off the two AAA batteries that are currently in the keyboard, as I can put up with using rechargeable AAA's.

The only thing about this is... I don't know what parts I need for this and Googling the topic isn't really helping.

FYI: I will be posting this exact same forum post into several different websites in hopes t reach a wider variety of people in different communities.

Reference for specs and things:

- Keyboard: blackweb wireless keyboard BWK950
- Keyboard power: 2x 1.5V AAA Batteries (3V total)

- LEDs: 2x 3V Blue LEDs

[Sage]

You can't convert 3V to 6V unless you use an amplifier of some sort (such as an OpAmp). Op-amps require power though.

You should be able to run both LEDS using 3V. Just put the LEDs in parallel. They will be half as bright as if you only powered 1, but should still do the trick. You might need to add a little resistance in series with each LED to make this work.

[Absolarix]

You can't convert 3V to 6V unless you use an amplifier of some sort (such as an OpAmp). Op-amps require power though.

You should be able to run both LEDS using 3V. Just put the LEDs in parallel. They will be half as bright as if you only powered 1, but should still do the trick. You might need to add a little resistance in series with each LED to make this work.

I had somehow completely forgotten about parallel circuits. Thank you. And I don't need any resistors for it.

*Facepalms, feeling like a moron*

[Sage]

It's okay, that's about the extent of what I've learned after 3 years of electrical engineering school