I've scanned through what I think are the appropriate sections and didn't come up with an answer. It's probably out there, but my keyword selection didn't yield any success.
I suppose this could be considered a flashlight... It's a single yellow LED powered by a 3v lithium flat disk cell, a CR2032, I think. The item is used to illuminate a bike computer mounted on the handlebars.
I have 12vdc available (13.7 nominal) and would like to bypass the lithium cell. Mechanically, it's not a problem, but I understand that I should have a current limiting resistor in the circuit.
I cannot determine visually if there is already a resistor in the circuit, but would there be, with only 3v powering the light? Perhaps that question displays my limited understanding of LED circuits.
I have the capability of installing the resistor in series with the LED or in parallel, but which is the proper method?
What value and what power rating (?) resistor do I need for such a modification?
thanks in advance for your consideration
fred
I suppose this could be considered a flashlight... It's a single yellow LED powered by a 3v lithium flat disk cell, a CR2032, I think. The item is used to illuminate a bike computer mounted on the handlebars.
I have 12vdc available (13.7 nominal) and would like to bypass the lithium cell. Mechanically, it's not a problem, but I understand that I should have a current limiting resistor in the circuit.
I cannot determine visually if there is already a resistor in the circuit, but would there be, with only 3v powering the light? Perhaps that question displays my limited understanding of LED circuits.
I have the capability of installing the resistor in series with the LED or in parallel, but which is the proper method?
What value and what power rating (?) resistor do I need for such a modification?
thanks in advance for your consideration
fred