goodpickles
New Member
I would like a circuit to run the Osram Golden Dragon LED, (Digikey part number 475-1263-1-ND) off of a 120ac circuit. I would like to make the complete circuit so that it fits into a small bayonet base bulb, so the size of the complete circuit would have to be under 22mm diameter x 45mm long. Last but not least the cost of the circuit has to be fairly economical (around $10.00).
Specifications on the LED according to the Digikey Catalog are:
Forward Voltage 3.2 v
Forward Current 500 ma
Typ. Mcd @ Current ma 15,000 @ 350
I have already looked at different options including:
a transformer:
I cannot find any that would meet these specs and that has a small enough physical size.
A capacitor to limit current:
Physical size is also a problem here. Also I am not sure what other components would be needed to make this work reliably.
A current limiting resister:
Obviously will not work because of the fact that this simply burns the extra energy. This would generate huge amounts of heat....(great for keeping my coffee warm).
Chaining a bunch of voltage regulators together such as the 7805:
Would also create huge amounts of heat. Size may also be a problem with as many as are needed.
Did I miss any obvious solutions? Does anybody have any ideas? I would sincerely appreciate any help that you could offer.
Specifications on the LED according to the Digikey Catalog are:
Forward Voltage 3.2 v
Forward Current 500 ma
Typ. Mcd @ Current ma 15,000 @ 350
I have already looked at different options including:
a transformer:
I cannot find any that would meet these specs and that has a small enough physical size.
A capacitor to limit current:
Physical size is also a problem here. Also I am not sure what other components would be needed to make this work reliably.
A current limiting resister:
Obviously will not work because of the fact that this simply burns the extra energy. This would generate huge amounts of heat....(great for keeping my coffee warm).
Chaining a bunch of voltage regulators together such as the 7805:
Would also create huge amounts of heat. Size may also be a problem with as many as are needed.
Did I miss any obvious solutions? Does anybody have any ideas? I would sincerely appreciate any help that you could offer.