Gent's I have found an electronic component that I want to use in a project.
it's an array of 940nm LED's, it draws 12v - 13.8v with optimum output at 13.2V, and it pulls right under 300ma
I went rummaging through my drawer at work and found an old 13V, 300ma power supply.
I put a meter on it, and low and behold it's a 18.16V power supply, while this does not surprise me, it does lead me to ask the question what sort of resister should I put into this project, and on which lead of the LED array should I put the resister on.
A helpful fellow told me that the formula Voltage Drop ( Supply Voltage - Desired Output Voltage) divided by .3 should give you how many ohms the resister should be
okay, great, 18.16 - 13.2 / .3 = 16.53 ohm
so is it that simple? do I have to worry about watts, the resisters I have found are listed as X ohms Y watts...
being electronically naive, I am begging for help picking the right resister
another thing, there is a little diagram on the brick <->--(*--<+> , does this mean that the little pin in the center of the plug is the + lead?
it's an array of 940nm LED's, it draws 12v - 13.8v with optimum output at 13.2V, and it pulls right under 300ma
I went rummaging through my drawer at work and found an old 13V, 300ma power supply.
I put a meter on it, and low and behold it's a 18.16V power supply, while this does not surprise me, it does lead me to ask the question what sort of resister should I put into this project, and on which lead of the LED array should I put the resister on.
A helpful fellow told me that the formula Voltage Drop ( Supply Voltage - Desired Output Voltage) divided by .3 should give you how many ohms the resister should be
okay, great, 18.16 - 13.2 / .3 = 16.53 ohm
so is it that simple? do I have to worry about watts, the resisters I have found are listed as X ohms Y watts...
being electronically naive, I am begging for help picking the right resister
another thing, there is a little diagram on the brick <->--(*--<+> , does this mean that the little pin in the center of the plug is the + lead?
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