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 Post subject: resistor help needed !
PostPosted: 20.08.2002 19:13 
Hello Japala,
I have been planing on doing this mod for quite sometime, and now I am ready to do it.
First off I have a standard Microsoft PS2 mouse that i want to use for the mod. I have gone to a store and brought two LED packs (2 LED's in each pack) both LED's are green:

1st Green:
2.1 volt | 30mA | 630mcd
and the 2nd:
2.1 volt | 25mA | 6.3mcd

now my question is "What is the difference between the two LED's?"
and my other question is what resistor do i need to buy in order to use one of the LED's in the same way you did in your Article?????? (what Ohm for resistor?)

thanks
-tr0ttl3r


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 Post subject:
PostPosted: 20.08.2002 19:22 
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Are you sure about that 6.3mcd? That's barely visible. :)

You should read the basic electricity for modder but here goes...

you are taking power from 5 volt line and one led needs 2.1 volts. You have excess of 2.9 volts. Current flowing through the led is 30 mA. Resistor should be 2.9 volts divided by 30 mA and that makes: 96.7 ohms. Just find the closest value from the store.


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 Post subject:
PostPosted: 20.08.2002 19:38 
Ok, sweet thanks a lot, i will go out and buy one right now. :)
-Thanks
-tr0ttl3r


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 Post subject:
PostPosted: 21.08.2002 05:12 
japala, at the store where i brought the resistor they did not have 96.7 ohms resistors :( ,
so the closest that the guy had was: 100k Ohm | 1/2 watt | 5% tolerence

will 100 ohms resistor work? or should i look around a little bit more and find a 96.7 ohm resistor :?:

thanks
-tr0ttl3r


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 Post subject:
PostPosted: 21.08.2002 07:45 
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Super Modder
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Joined: 28.01.2002 10:31
Posts: 941
Location: Tuusula, Finland
100k will be just fine.

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 Post subject:
PostPosted: 21.08.2002 08:43 
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That is 96.7 ohms. 100k ohms would be 99900 ohms too high. That k means that the value is 1000 times higher than the number indicates. You just have to find another store where to look at for that resistor.


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 Post subject:
PostPosted: 21.08.2002 09:35 
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Super Modder
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Sorry, 100 ohms is much better. My fault... Just woke up...

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 Post subject:
PostPosted: 21.08.2002 16:39 
so in what range should the resistor be? just 100 ohms 90 ohms ?


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 Post subject:
PostPosted: 21.08.2002 16:55 
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80 - 120 ohms should be quite ok. Higher the value -> dimmer the led, lower the value -> brighter the led.


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 Post subject:
PostPosted: 11.09.2002 18:09 
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Junior Modder
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Joined: 09.09.2002 17:36
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japala wrote:
80 - 120 ohms should be quite ok. Higher the value -> dimmer the led, lower the value -> brighter the led.


so if you want a bright LED you should get a resistor with lower ohm´s than the exact value that I need?


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 Post subject:
PostPosted: 11.09.2002 18:48 
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Mini Modder
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Joined: 29.07.2002 22:14
Posts: 39
Location: Calgary, Canada
Well not exactly, if you go smaller then the value calculated then the LED will be brighter but will burn out faster. The best bet is to calculate the value you need and find the closest standard resistor value to that +- a bit won't matter too much. I usually go with a larger resistor this will ensure that my $5 LED doesn't burn out.


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