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Thread: dome light dimmer (with delay)

  1. #31
    Newbie gr_diver's Avatar
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    Some cars have three positions at the steering column lock. The first is usually ACC, and when selected power is given to the "ACCessories", like the stereo, the heater fan etc. the second position is called "RUN", and when it is selected, appart from the accessories, power is also given to all the circuits that are needed for the engine to run (ignition etc.). Finally there is the "START" position, which when selected makes the starter motor kick in.

    So, the ACC, is a power source that is powered when the key is at the ACC position.
    -------------------------------------------------------
    I can fly occasionally, but I always wake up afterwards...

  2. #32
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    Oct 2007
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    hope its not 2 late

    I know this thread has been a while n i'm kinda late. but its better 2 be late than never rite?
    anyway, im about to build this kit but im having problem in finding bc413c, can i replace it with sometin else?

  3. #33
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    You can use just about any small NPN transistor. I have used a PN2222A. You could use 2N2222, 2N3904, BC547 or a hundred other small signal transistors

  4. #34
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    Apr 2008
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    here is my circuit

    I changed 39K resistor with a variable one to control the current flow,

    thanks to kronos...




  5. #35
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    Sep 2008
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    Problem with the circuit

    Hi i did this 4 times and the 4th time it worked, I've used equivalent values for the t2 which is bc548 & ic is c358c and i changed the r6 39k to a 1k and the 1.2 to 2.2k as per the circuits pcb board thanks for it but please next time put the correct values as it has been giving me head ache to get this done thanks again.

  6. #36
    Maximum Bitrate americasfuture2's Avatar
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    has anyone figured out the light fade off look yet?

  7. #37
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    Mar 2009
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    First a little background...I do automotive wiring repairs and electrical component installation, alarms, stereos, fog lamps etc...so this is my first attempt at building this dimmer, my current client wants this in his car...so here I am and plan on sticking around here cuz you guys know your stuff.

    I just bought all the parts to build the dimmer, and was wondering why the 8 pin switch is not in the diagram...is the diagram an up dated version?..my parts were purchased by the parts listed on the diagram...just before checkout I did not see this part...also want to thank the guy who designed this, just wish there was a simpler way to do this

    Dave

  8. #38
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    Oct 2007
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    wanted to bump this up... does anyone know if there's a way to modify this to fade IN when the light comes on initially? my LED lights are kind of startling when they come on at night

  9. #39
    Maximum Bitrate americasfuture2's Avatar
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    yea, fade in and fade out would be great

  10. #40
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    Jan 2010
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    Hi guys

    I just made this circuit (i have little knowledge on electronics so i copied the photo of kronos' board) with a few differences in components (IC: LM358 and T2: BC549).

    the delay fade works great but the ACC function doesn't quite work: when the key is on ACC the delay doesn't cancel. but once it fades off, the light doesn't turn back on when the door is open in ACC position.

    i thought maybe i got T2 the wrong way so i flipped it but that caused my headunit to turn on (without putting in the key!).

    Can someone please help me identify what could be the problem? is it the different IC/T2 i'm using?

    thanks in advance!
    also i'd like to thank kronos for posting this circuit. it really is a useful feature

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