[Laser] LED negative resistance

[Ron Simpson]

Hello James,

Since you cannot measure the voltage and current at the LED because it is sealed, you have to do some math to get the true result. 

Do you know what LED the manufacture has chosen and do you know what kind of current draw it was designed around?

You can make a guess I suppose.

Keep digging I think you have a good idea there. If this is night time event, design it for red LED's.

With a little work you can take the filament bulb apart and put in a known LED and bias it for the current you need.

I play with the 3 watt LED's I get two current readings one at the LED is always different than the one at the supply. There is current in the dropping resistor, since they can get warm there is additional losses 

Publish your work please!

Our Ham Club helps out on BSA Events. They might like to do this too!

Ron,
N6GKJ

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