car light dimmer

[andrew2022]

to dim the interior light of a car when the door is closed, could a large cap be used to charge when the light is on and discharge when the door is closed, dimming the light?

 

[tansis]

Well... it can be done like that

or you might want to consider something like this

**broken link removed**

 

[Oznog]

Generally this would not be the way to do it. This would require a very large cap, the speed of dimming would vary greatly with how many lights were hooked up to it, and it would tend to draw a large inrush current when turned on unless special circuity is added.

This is certainly done with PWM. It's cheaper to mfg and will behave more consistently.