what resistor for 445 diodes in parallel?

They're 2.2MΩ

mega ohms?

so im guessing the chap in maplin gave me the wrong ones?

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Originally Posted by andy_con

so im guessing the chap in maplin gave me the wrong ones?

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Standard... *DZ

http://4.bp.blogspot.com/_VPNJ1Mj-cl...n-standard.jpg

ill use ebay, you can go wrong with ebay :confused:

Don't forget the power involved @ 1Amp they will be dropping 2.2v.

2.2v x 1Amp = 2.2W dissipated.

http://cgi.ebay.co.uk/2-x-2-2-Ohm-3W...item19c0e41eba

ok cheers .

If I am understanding all this correctly, 4x 445nm diodes wired in series would need 4x 2.2 ohm 3 watt resistors. The first resistor in the + side wire going to the the first diode. The next 3 resistors inbetween each of the remaining 3 diodes, correct?

For a single 445nm diode use the same resistor?

Quote:

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Originally Posted by Phredy1

If I am understanding all this correctly, 4x 445nm diodes wired in series would need 4x 2.2 ohm 3 watt resistors. The first resistor in the + side wire going to the the first diode. The next 3 resistors inbetween each of the remaining 3 diodes, correct?

For a single 445nm diode use the same resistor?

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Diodes in series don't need a resistor. The current will be the same through a series circuit. A single diode doesn't need a resistor because it is not "fighting" for current with any other diodes.

hope this helps.

Quote:

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Originally Posted by logsquared

Diodes in series don't need a resistor. The current will be the same through a series circuit. A single diode doesn't need a resistor because it is not "fighting" for current with any other diodes.

hope this helps.

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It might be one of those rare high-binned diodes that chooses the right to fight with itself. :p

Wait a minute....what?

Only multiple diodes wired in parallel do we need to put resistors in? Wired in series no resistors needed?

I'm going to borrow Andy's word. WTFook?