Cheawick
New Member
Hello folks, been years since I was serious about this subject so now cobwebs have got my brain a bit stuck.
Please consider the following:
Using 4 LEDs @2.1v, 20ma (each)
Using 2 D size batteries @ 1.2v, 4,500 mAh (each[not sure what mAh is])
Question:
What is mAh, what resistance is required to keep from frying the LEDs, and what formula calculations were used to come to this conclusion.
Basically I'm trying to make a string of LEDs like steady/blinking eyes for a halloween gag in the front yard. But i'd like to re-learn my old craft and build this project with as little help as possible. I promise to post my final design and even a few pics (if possible).
Please consider the following:
Using 4 LEDs @2.1v, 20ma (each)
Using 2 D size batteries @ 1.2v, 4,500 mAh (each[not sure what mAh is])
Question:
What is mAh, what resistance is required to keep from frying the LEDs, and what formula calculations were used to come to this conclusion.
Basically I'm trying to make a string of LEDs like steady/blinking eyes for a halloween gag in the front yard. But i'd like to re-learn my old craft and build this project with as little help as possible. I promise to post my final design and even a few pics (if possible).