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Author Topic: FAQ for first time case modders  (Read 88085 times)

AlienBlood

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FAQ for first time case modders
« Reply #130 on: June 29, 2003, 06:01:57 PM »

I think he meant plug/unplug things while the PSU is on.  The only time it should cut off is if u short a wire to ground.
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Macross2b5

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FAQ for first time case modders
« Reply #131 on: July 10, 2003, 12:50:53 AM »

Ok let me know if I'm wrong..But if you have a LED on a 5 volt line and the LED is rated for 3-4.5 volts..you don't have to put a resistor on if you don't want to right??
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Modding, Is it safe? Sure, thats what we have the armor for....

TokMor

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FAQ for first time case modders
« Reply #132 on: July 10, 2003, 05:38:22 AM »

well, since 5 volts is greater than 3-4.5 volts, then you should use a resistor, since it will most definatly fry a 3v rated and probaly make the 4.5 last much shorter if at all. You can get a pack of resistors for almost nothing at radioshack, and even less at some other places (allelectronics.com)
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Driphter

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FAQ for first time case modders
« Reply #133 on: July 28, 2003, 09:36:15 PM »

Wow thanx for all the tips (and there were alot of them :o )
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Daneel

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FAQ for first time case modders
« Reply #134 on: July 29, 2003, 06:24:34 PM »

Quote from: ZiKi
bump!


WTF???  this is a sticky topic, why the fruit did you bump?

anyway, a few things:

1) USE THE RESISTOR, LEDs change colour when you use a higher voltage usually...  (eg, blue becomes cyan and green becomes yellow at a higher-than-rated voltage)

2) LAPTOP LCDs CANNOT BE CONNECTED TO A DESKTOP COMPUTER WITHOUT A ~$200 ADAPTER CARD.  THERE ARE NO EXCEPTIONS!!!  obviously LCDs can, but only if they have/can have the right plugs (eg, like the kind of screen in the back of a car seat)

3) what's wrong with pluggin in/unplugging things while your PSU is on???  obviosly, don't do it with HDDs or your mobo or radeon GFX but you CAN do it with CD drives.  you CAN do it with CCFLs.  you CAN do it with fans.  etc etc...

i've done it many times and only ever had one crash and that was because the circuit that i plugged in was faulty and shorted so the PSU turned off...

4) If you're not having fun, don't, unless it will lead to fun.  modding is all about having fun.  so have fun!
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hermangarza

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FAQ for first time case modders
« Reply #135 on: July 29, 2003, 08:42:34 PM »

you can but try to never do that unless you really really have to use the cd drive while computer is on
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Frost_Fire

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FAQ for first time case modders
« Reply #136 on: August 16, 2003, 07:51:51 PM »

always wear goggles while dremmeling 8)  i learned the hard way and got a few peices of metal in my eye it wasnt fun at all  :wtf:
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PetaHertz

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FAQ for first time case modders
« Reply #137 on: September 22, 2003, 03:36:20 PM »

ALWAYS use a resistor in series with an LED.  LEDs are diodes, which operate like a short circuit in one direction, and an open circuit in the other.  What does this mean?  When the LED is forward biased it has a resistance (R) = 0 (or very close to it).  Current equals voltage divided by resistance (I = V/R).  If R=0 then I = V/0, and as we all know anything divided by 0 is essentially infinity.  that's a lot of amps.  All LEDs require a current limiting resistor.  It doesn't matter what the voltage on the line is.  The Voltage rating on an LED is the voltage required to push the LED into a forward bias.
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Squeak

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FAQ for first time case modders
« Reply #138 on: October 10, 2003, 11:07:26 PM »

but doesnt p=vi?
therefore p=5*infinity
so power would be infinite?
so the power taken from your power supply would be huge? :-?
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orion

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FAQ for first time case modders
« Reply #139 on: October 10, 2003, 11:46:37 PM »

Quote from: PetaHertz
which operate like a short circuit in one direction, and an open circuit in the other.


Actually, that's not really the issue here.  The current limiting resistor is there to prevent thermal runaway as described in the following article:

Building an LED caselight
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