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Potentiometer to dim 12v bulb?

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HondaCop

New Member
I am going to use automotive, 12v bulbs for a special project of mine and have a couple of questions on how to dim the bulbs with a potentiometer. The bulbs are these: GE Lighting 194NA Automotive Front Sidemarker Light Amber Miniature Bulb (44859) 10 Lamps per Tray

My question is...

1. Seeing that these bulbs are 3.78 watts, do I need to make sure that the potentiometer I use to control the voltage into the bulb is at LEAST a 4 watt potentiometer?

2. How many Ohms should my potentiometer be?

I was looking at these potentiometers: http://www.mouser.com/Search/Refine....355+4294576007 but I cannot figure out which one would do the job for me.

BTW, the bulbs will be assembled parallel to each other.

Thanks for the help!

Regards,

HondaCop
 

Hero999

Banned
Here's the simplest PWM circuit I know of, it'll work with the NE555 but it probably won't be as good.
 

marcbarker

New Member
As an alternative. Dashboard Illumination control rheostat? That's if can find one from a car scrapyard on a car that's old enough.
 

stevez

Active Member
You mention "parallel" - keep in mind that the current for each bulb must be handled - so the number of bulbs will determine the power - if all powered from the same control.
 
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