Hi. I'm putting together a panel that will have 27 small indicator LEDs on it. I'm thinking I'd like to have a way to dim them all if the room the panel is in has the lights turned off.
There are 3 different colors so each LED will have a resistor to on it sized to typical IF. (example- Red LED 2.0v IF=20ma. It's 12vdc so 500ohm resistor).
(12v-2.0v/.02a =500ohm). I'd then like to take the common from all the LEDs and run them through a POT to "ground".
I'm trying to figure out what size POT I need. Not only how ohms it will take to dim them down but also how many watts the POT needs to dissipate.
Thanks!
There are 3 different colors so each LED will have a resistor to on it sized to typical IF. (example- Red LED 2.0v IF=20ma. It's 12vdc so 500ohm resistor).
(12v-2.0v/.02a =500ohm). I'd then like to take the common from all the LEDs and run them through a POT to "ground".
I'm trying to figure out what size POT I need. Not only how ohms it will take to dim them down but also how many watts the POT needs to dissipate.
Thanks!