Batteries and Voltage Regulators..How do I provide 12v & 5v?

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scamp
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Joined: Tue Nov 15, 2011 8:02 pm

Batteries and Voltage Regulators..How do I provide 12v & 5v?

Post by scamp » Sat Nov 26, 2011 8:02 pm

I'm not an electronics guru....

How can I provide 12v for a screen and 5v to power everything else for my handheld?

Do I put in 2 voltage regulators (a 5v and a 12v) and have my battery feed both?

I'd rather not have multiple battery packs in my device....

Thanks!!

-S

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Trollman
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Re: Batteries and Voltage Regulators..How do I provide 12v & 5v?

Post by Trollman » Mon Dec 19, 2011 7:48 pm

Yes, you can use one battery pack to power your entire portable by simply attaching multiple wires to the PCB (Protection Circuit Board). Two wires, one positive and one negative, without a regulator (presuming the battery pack is roughly 12v) can power the screen. The other two wires can have a 7805 regulator (http://www.radioshack.com/product/index ... Id=2062599) attached to the negative side to adjust the voltage to 5v. Be warned; that kind of regulator bleeds heat, and must be placed close to the fan.

Hope this helps!

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hailrazer
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Re: Batteries and Voltage Regulators..How do I provide 12v & 5v?

Post by hailrazer » Mon Dec 19, 2011 8:40 pm

Most screens can run just fine on 7.4v so you can use camcorder batteries to power them.

Then use a 7805 to power the system.

But most systems run fine on 7.4v also. What system are you portabalizing ?
My Portable Systems:
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