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Old 02-14-2008, 10:57 PM #1
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Default need resistors

Does anyone know where i can find a 3 Ohm or 7 Ohm resistor? if anyone has one or two would you be interested in selling?


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Old 02-14-2008, 11:02 PM #2
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Default Re: need resistors

Hi

http://search.digikey.com/scripts/Dk...?KeywordSearch

SN
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Old 02-14-2008, 11:02 PM #3
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Default Re: need resistors

I have 4.7ohm resistors. Lots of them
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Old 02-15-2008, 12:04 AM #4
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Default Re: need resistors

Quote:
Originally Posted by bcroft
Does anyone know where i can find a 3 Ohm or 7 Ohm resistor? if anyone has one or two would you be interested in selling?
I found these:

http://www.part***press.com/pe/showd...rtnumber=003-3

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Old 02-15-2008, 12:24 AM #5
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Default Re: need resistors

Here's some 1/2 watt ones that work just fine for 420mA's,
http://search.digikey.com/scripts/Dk...l?name=3.0H-ND
but, might as well get the 1 watt ones that Gazoo found there...
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Old 02-15-2008, 01:17 AM #6
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Default Re: need resistors

1 watt is better than 1/2?
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Old 02-15-2008, 03:23 AM #7
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Default Re: need resistors

1/2watt is enough, 1 watt and the resistor is bigger. depending on the current, you may be able to get away with 1/4 watt
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Old 02-15-2008, 07:39 AM #8
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Default Re: need resistors

Quote:
Originally Posted by SargeMX5
1/2watt is enough, 1 watt and the resistor is bigger. depending on the current, you may be able to get away with 1/4 watt
If using a 3 ohm resistor with the LM317, the current going to the diode will be 416ma's. This means you need a .52 watt resistor. Granted you could use a 1/2 watt resistor, but I like to follow ohms law and do what ohms law is telling me to do.

You can get away with a 1/4 watt resistor if you drive the diode with 200ma's or less. The calculations are very simple when working with the 317.


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Old 02-15-2008, 01:10 PM #9
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Default Re: need resistors

cool, ill order that flame proof one you linked gazoo, *I appreciate it everyone, thanks!
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