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Author Topic: 9volt from psu?  (Read 1542 times)

till_boffin

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9volt from psu?
« on: April 19, 2004, 10:30:56 PM »

I purchased a led chaser kit from xoxide and it runs off of a 9v battery, i am hoping that it will be possible to run it off of, oh say, the 12v line somehow. if anyone has done this, or knows how, any help is much appreciated.
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viridius

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9volt from psu?
« Reply #1 on: April 19, 2004, 10:36:47 PM »

Go down to Radioshack and pick up a 7809 voltage regulator.  It's good up to one amp.
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till_boffin

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9volt from psu?
« Reply #2 on: April 19, 2004, 10:39:01 PM »

thank you
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jomo

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9volt from psu?
« Reply #3 on: April 22, 2004, 10:46:30 PM »

i reember reading sumting like if u use the 12vlt and the ground for the 5vlt then u get 9vlt

search it
i think its right...sum config like that
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BalefireX

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9volt from psu?
« Reply #4 on: April 22, 2004, 11:36:34 PM »

If you use the 12v as power and connect the 5v to ground, you get 7v.  12-5 = 7

Good for making fans quieter, but not good for 9v :)
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SerialKillinSam

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9volt from psu?
« Reply #5 on: April 23, 2004, 12:08:57 AM »

i thought both the black ground wires were just ground
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BalefireX

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9volt from psu?
« Reply #6 on: April 23, 2004, 12:16:30 AM »

Both black wires are ground... if you connected a fan to 12v and 5v instead of 12v and Ground, you would get 7v through the fan = lower RPM = less noise.
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jomo

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9volt from psu?
« Reply #7 on: April 23, 2004, 03:03:34 AM »

well another idea...u could run it using a 12vlt from molex and along the way put a resistor on it
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infinitevalence

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9volt from psu?
« Reply #8 on: April 24, 2004, 02:57:45 AM »

Quote from: jomo
well another idea...u could run it using a 12vlt from molex and along the way put a resistor on it


this works but creates more heat and more stress on the psu.  the regulator is a better idea and almost as easy to do as adding the correct resistor.
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viridius

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9volt from psu?
« Reply #9 on: April 26, 2004, 12:00:43 AM »

Easier.  You have to calculate using the current draw of the device, which can vary.
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