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Resistor

Bobski

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Just went to jaycar and bought a bright as fuck LED.. walked out when they closed. Drove home. Got out..... ****. It needs a 300 ohm resistor. I hate electronics.. Why cant it be as simple as proper electrical lol. Anybody know what they are worth? and JB hifi wouldn't stock them would they?

Cheers
 

SweetWagon

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Just went to jaycar and bought a bright as fuck LED.. walked out when they closed. Drove home. Got out..... ****. It needs a 300 ohm resistor. I hate electronics.. Why cant it be as simple as proper electrical lol. Anybody know what they are worth? and JB hifi wouldn't stock them would they?

Cheers

Sure it only needs 300ohm?

resistors are only worth a few cents each.. JB hifi definitely do not have them lol
 

Bobski

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I think it's only 300 anyway.. they run at like 40mA or something don't they?
Simple ohms law.

I'll have to scoot down to an electronics store tomorrow at trade school.
 

SweetWagon

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I think it's only 300 anyway.. they run at like 40mA or something don't they?
Simple ohms law.

I'll have to scoot down to an electronics store tomorrow at trade school.

they all differ, what colour/size is it?

also need to factor in the car charges at 13.8-14.4v not 12v.
 

Bobski

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yeah I thought about that after I posted it. It's bright white .. like really bright.. what you mean by size?
 

SweetWagon

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yeah I thought about that after I posted it. It's bright white .. like really bright.. what you mean by size?

like 3mm/5mm etc.. usually you only want about 20mA so i'd be looking at at least 500ohm resistors, you are putting it into your car right?
 

Bobski

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It's a 5 mil. What's the harm in going a little more though? It will lessen the life of it but surely not by that much? But yeah in the dash
 

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It's a 5 mil. What's the harm in going a little more though? It will lessen the life of it but surely not by that much? But yeah in the dash

Better to be safe i guess, i did the same thing just going off what i have been told but the LED's are still going strong, thats approx 6 months ago now so cant cause too much harm to them.
 

Bobski

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Yeah, funny thing is I'm learning about all that electronics **** now at trade school and sit the exam tomorrow.. you would think I should know it haha
 
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