Date:         Mon, 31 Jul 2017 12:00:24 -0700
Reply-To:     Alistair Bell <albell@SHAW.CA>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Alistair Bell <albell@SHAW.CA>
Subject:      Re: Time Delay LED Lighting Circuit
Comments: To: Neil N <musomuso@GMAIL.COM>
In-Reply-To:  <CAB2RwfgES0Vy2fsqrKiPXzHw=okR2QGiXAT2wRHhxNAtfBcvvA@mail.gmail.com>
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Yea Neil I've put a golf/Jetta league 80s early 90s dome light in. Same look as the vanagon lamp but with the delay circuit.

I haven't bothered to look at the circuitry. But the delay off feature happens after 6 - 7 seconds, that's light on then off . No dimming as it goes off as you find it other cars ( ie BMW).

What do you think the voltage drop profile will look like in your circuit? Maybe a bit of a dimming then off? Leds don't dim that well with decreasing voltage, there is a minimum voltage to make it light up.

Alistair


> On Jul 31, 2017, at 11:54 AM, Neil N <musomuso@GMAIL.COM> wrote:
> 
> Hi all.
> 
> If I recall, some folks here (attn: Bell Industries??) have installed
> a timed dome light from another VW into their Vanagon.
> 
> Save for the voltage supply amount, resistor (not needed with
> automotive application 12 volt LED?), capacitor voltage rating, switch
> arrangement, is that VW time delay light basically designed like this?
> 
> Link to image of schematic for a time delay light:
> 
> http://www.learningaboutelectronics.com/images/chargeCapacitortolightLEDschematic.jpg
> 
> I'm thinking of building this but with a 16 Volt 4000 uF (or similar)
> cap and installing the push button near the ignition tumbler. (I'd
> thought to tie it to the Su circuit but would rather have the choice
> of enabling light when needed, not every time I remove the ignition
> key)
> 
> Thanks
> 
> Neil.