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Old 23rd May 2005, 06:51 PM   #1
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Join Date: Sep 2004
Location: Binyamina
Default car light dimmer

hi all.

i want to build a good dimmer to my inside light of in my car...

when i close the door... the light is terns off progressively....


by the way.....the lamp is 10W 12V.

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Old 24th May 2005, 10:45 AM   #2
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i build this and is only make a delay....... it is no work like a dimmer.

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Old 24th May 2005, 03:28 PM   #3
Eva is offline Eva  Spain
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Pulse width modulation techniques are required in order to dimm a 12V light bulb without wasting a lot of power. Modulation frequencies may be as low as 100Hz to reduce EMI radiation

There are a lot of analog PWM ICs suitable for doing that. The good old SG3535 and TL494 may be used, ramping its duty cycle with a capacitor charged or discharged through a current source

Another approach may be to do the PWM and control logic in software using a simple low-cost microcontroller. I've succesfully used the PIC12C family from Microchip for several custom automotive applications. Sometimes going PIC saves a lot of development time in comparison with the equivalent analog solution
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