9.6 v battery + usb cable + samsung p2 = dead p2. why?

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samjc3
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9.6 v battery + usb cable + samsung p2 = dead p2. why?

Post by samjc3 » Sun Mar 08, 2009 8:50 pm

ok. i was trying to rig up a battery powered charger for all my usb devices, so i did this:
-i took a 9.6 volt 1600 mah rc car battery, an old male connector for the battery, and an old usb cable.

-i soldered the power and ground from the usb cable (red is power, black is ground) to the male connector. (assuming black was ground and red was power)

-i isolated the wires, then plugged the charging cable for my samsung p2 into the apparatus, plugged it into my p2.

-my p2 literally exploded.


why did this explode my p2? (i checked on p2 wall chargers and the put out 9.6 volts at 600 mah)
could the extra mah be the problem? or is red ground on an rc car battery? :?: :?: :?:
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HotDog-Cart wrote: Also, the codename stuff adds a little bit of sexyness, in my eyes.
Yeah well Alcohol adds a little bit of sexyness in my eyes, but I dont drink it all the time. :wink:
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Re: 9.6 v battery + usb cable + samsung p2 = dead p2. why?

Post by jleemero » Sun Mar 08, 2009 8:51 pm

9.6 volts == WAY TOO MUCH.

USB == 5 volts, at 500mah.
You just gave it 9.6 volts at 1600mah.

That's why.

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Re: 9.6 v battery + usb cable + samsung p2 = dead p2. why?

Post by samjc3 » Sun Mar 08, 2009 8:55 pm

i would agree, except the wall charger puts out 9.6v too, and that doesnt blow it up
AfroLH wrote:
HotDog-Cart wrote: Also, the codename stuff adds a little bit of sexyness, in my eyes.
Yeah well Alcohol adds a little bit of sexyness in my eyes, but I dont drink it all the time. :wink:
SpongeBuell wrote:As proof, I offer this picture of a monkey on my head.

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Re: 9.6 v battery + usb cable + samsung p2 = dead p2. why?

Post by jleemero » Sun Mar 08, 2009 9:02 pm

Wait, what?
The Wall Charger for this USB Powered device outputs 9.6v ?
Well I'd call that odd, but alright.

I'm going to guess you wired something wrong then, because I wouldn't expect the Ampere rating to cause that.

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Re: 9.6 v battery + usb cable + samsung p2 = dead p2. why?

Post by samjc3 » Sun Mar 08, 2009 9:06 pm

jleemero wrote:Wait, what?
The Wall Charger for this USB Powered device outputs 9.6v ?
Well I'd call that odd, but alright.
actually, its not all that uncommon. ipods, archos, cowon, and some of the irivers take 9.6v from their wall chargers. :)
AfroLH wrote:
HotDog-Cart wrote: Also, the codename stuff adds a little bit of sexyness, in my eyes.
Yeah well Alcohol adds a little bit of sexyness in my eyes, but I dont drink it all the time. :wink:
SpongeBuell wrote:As proof, I offer this picture of a monkey on my head.

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Re: 9.6 v battery + usb cable + samsung p2 = dead p2. why?

Post by palmertech » Sun Mar 08, 2009 9:28 pm

Only under no load. Measure it when it charges, down to 5v.

Damn Chinese crazy power adapters. :lol:
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Re: 9.6 v battery + usb cable + samsung p2 = dead p2. why?

Post by XCVG » Sun Mar 08, 2009 9:39 pm

Wow, fail. That has got to be one of the funniest posts of all time.

The USB spec is 5V. You just dumped 9.6+ volts into a USB device. Maybe you have learned a lesson here: use a 7805.

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Re: 9.6 v battery + usb cable + samsung p2 = dead p2. why?

Post by Bibin » Sun Mar 08, 2009 9:59 pm

POWER! You're doing it wrong!
...

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Re: 9.6 v battery + usb cable + samsung p2 = dead p2. why?

Post by Kurt_ » Sun Mar 08, 2009 10:05 pm

USB Outputs a maximum of 5V 1000mA, like has already been said. It ONLY outputs 5 volts, all the time. You put twice as much voltage as required or wanted. An expensive lesson indeed.
Hey, sup?

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Re: 9.6 v battery + usb cable + samsung p2 = dead p2. why?

Post by samjc3 » Mon Mar 09, 2009 5:14 pm

palmertech wrote:Only under no load. Measure it when it charges, down to 5v.

Damn Chinese crazy power adapters. :lol:
:evil: :twisted: :evil: :twisted: argh!!!! cheap chinese stuff!!!! :twisted: :evil: :twisted: :evil: :twisted: :twisted:
AfroLH wrote:
HotDog-Cart wrote: Also, the codename stuff adds a little bit of sexyness, in my eyes.
Yeah well Alcohol adds a little bit of sexyness in my eyes, but I dont drink it all the time. :wink:
SpongeBuell wrote:As proof, I offer this picture of a monkey on my head.

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Re: 9.6 v battery + usb cable + samsung p2 = dead p2. why?

Post by Aguiluz » Tue Mar 10, 2009 9:17 pm

Oh.... Dear.... :shock:

Use a 7805 to kick down 9.6V to 5V which is good for USB devices.
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