HappinessHacker
Newly Enlightened
- Joined
- Apr 9, 2014
- Messages
- 2
Greetings! We want to expand the existing battery capacity on two small LED lights to run for a longer time on C or D batteries for a children's project. I feel sure we probably will need resistors to protect the LEDs with the larger batteries.
I am not sure how to compute the resistor size since I can't find the exact specs on the LEDs (they're encased in the plastic lights.) I know Ohm's Law, I'm just not sure how to apply it here. I also have a multimeter, a soldering iron and can follow instructions :naughty:
To make things easier, we thought we'd stick to the same, existing voltages:
LED light #1 runs on 3 LR44's => ~ 4.5 volts REPLACE WITH (3) C or D batteries in series => ~ 4.5 volts
LED light #2 runs on 1 CR2032 => ~ 3.0 volts REPLACE WITH (2) C or D batteries in series => ~ 3.0 volts
What's the best way to approach this? I've searched and Google'd it but I don't see anything like this. I would hate to blow up a child's favorite light.
Many, MANY THANKS!!!!!
I am not sure how to compute the resistor size since I can't find the exact specs on the LEDs (they're encased in the plastic lights.) I know Ohm's Law, I'm just not sure how to apply it here. I also have a multimeter, a soldering iron and can follow instructions :naughty:
To make things easier, we thought we'd stick to the same, existing voltages:
LED light #1 runs on 3 LR44's => ~ 4.5 volts REPLACE WITH (3) C or D batteries in series => ~ 4.5 volts
LED light #2 runs on 1 CR2032 => ~ 3.0 volts REPLACE WITH (2) C or D batteries in series => ~ 3.0 volts
What's the best way to approach this? I've searched and Google'd it but I don't see anything like this. I would hate to blow up a child's favorite light.
Many, MANY THANKS!!!!!