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Usb Charger Answered

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I have 2 questions; 1.) Does anyone know if I can use a resistor in a usb charger? If so, what bands.(ex red,blue green, ect). 2.) Can I use an 3v LED to reduce the power to 6v. Would 6v harm my electronics?

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zachninme (author)2008-01-21

3v is just how much voltage is needed to power the LED, but you can run several 3v LEDs off of 3v.

It really depends on what the device needs -- although don't you charge iPods from USB?

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ry25920 (author)zachninme2008-01-21

What im tring to say is, I don't have access to a 5v regulator. Do you know if 6v is o.k. for a usb operated device? And, I charge my ipod with the cable that came with it.

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zachninme (author)ry259202008-01-21

I wouldn't risk it with 6v... Do you have zener diodes? You can use those to drop down the voltage...

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guyfrom7up (author)zachninme2008-01-21

isn't that really inefficient because you'r shorting the battery out? I've never been sure about zeners, in series (for example in this situation) would it only allow 5 volts through? Or if you have a 7 volt supply it just allows 7 volts through. or if your have a 7 volt supply it only allows 6.3 volts because of the junction. Which brings me to a point, you could just use a diode, it'd bring it down to 5.3, still risky though.

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zachninme (author)guyfrom7up2008-01-21

Wait, why would a normal diode bring it down? And you're oversimplifying the zener situation, since they can be rated for different voltages, right?

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guyfrom7up (author)zachninme2008-01-22

yeah, I'm over simplifying. a silicon diode drops 0.7 volts across it because of the pn junction

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Brennn10 (author)ry259202008-01-21

5V is standard for most electronic devices. With 6V, you are running the chance of frying your device. Are you sure you can't gain access to a 5V regulator?

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ry25920 (author)Brennn102008-01-21

do you know anything that would have a 5v regulator in it?

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Brennn10 (author)ry259202008-01-21

Sorry, no. If you can't purchase one online, then if you can travel to a Radioshack you should find one there.

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LinuxH4x0r (author)2008-01-22

Why don't you just get a commercially made charger. I picked up a wall and a car charger (and a cable I put on graigslist) for only $10. its usually not that cheap to make one.

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ry25920 (author)2008-01-21

zener diodes? Is that like a regulator?

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zachninme (author)ry259202008-01-21

No, its a diode that only lets certain voltages through, but it can be used to chop down voltages.

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ry25920 (author)zachninme2008-01-21

do you know what would have a zener diode in it

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