i need help from some one smart. will a single AAA battery work to power a single 1.7 volt, 20mA, 3000mcd LED light? Is this too much power for the bulb? If so how can i choke the AAA down to work? Thanks in advance.
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Shouldn't be a problem. -
It’ll work, but I’d put a 100 ohm resistor in series to limit the current. This will protect the diode from a shorter than expected life. Depending on the type of battery, it may last about 12 hours.Comment
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Shouldn't be a problem...like other's have said, you need to be mindful of the amount of current you're putting through the LED via a series resistor...you'll want enough to cause the photodiode to turn on but not too much as to burn it out. Also, each battery is rated in terms of milliamp hours...that is, it's total current capacity. If a battery has 100mAh and you're constantly drawing 20mA from it, you can expect about 5 hours of life. Lastly, look up the part number on google and read the data sheet...most of the time they'll give you a sample circuit to use that has the appropriate resistor value(s) so that you maximize brightness out of the LED...if you need any further help, shoot me a PM and I can try and help.
Edit: I was so concentrated on the current I didn't look at the voltage specs...if the LED truly requires 1.7 volts, you may need to go with 2 batteries b/c most typical AAA cells are around a volt and a half unloaded...Last edited by JonBoy; 09-15-2010, 01:09 PM.Comment
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