With all the talk about a delay circuit, here is what I have.  I didn't have time during the week to take pictures and post until tonight.

I got this module from a vendor over 30 years ago.  He was trying to have us put it into our trucks as a standard or option ( I used to work Peterbilt Motors).  He gave us samples and I still have one.  It's a "plug and play".  I have never seen another one this small.  It's about 2 1/8" long and a little less than 3/8" in diameter.

If someone wants to duplicate it, all I ask is that you give me a couple in return as payment.

Here is the link to a video and pictures.  The delay is about 10 seconds and this is powering the three interior (LED) lights of my tin top.  https://tinyurl.com/y9ejfkvj

Unfortunately, after messing with it and taking pictures, it doesn't seem to work anymore.  Lights will not go off, it just stays on. I am bummed now.

-Dick-

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Alistair Bell
Sent: Wednesday, August 2, 2017 5:40 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Time Delay LED Lighting Circuit

Neil,

Where is my brain? I just remembered I bought a delay timer really unit from banggood. It's this one

Geekcreit® DC 12V LED Display Digital Delay Timer Control Switch Module PLC https://banggood.app.link/YobsCIrqiF

I haven't tried it, and I forget why I bought it :-)

But i think it might be a solution for you. It's not very big.  Up to 999 second delay via a relay. Maybe I'll set it up on the breadboard to give you an idea of how it works. And give me an idea of how it works.

Alistair

> On Aug 2, 2017, at 1:09 PM, Neil N <musomuso@gmail.com> wrote:
> 
> Thanks for that David. I've been so involved in other wiring projects, 
> haven't read this thread yet.
> 
> Thats a sizeable cap! Image showing measurements:
> 
> http://tinyurl.com/ybxpvnx5
> 
> I did see your comment on semiconductors being used for this type of circuit.
> 
>> On 8/2/17, David Beierl <dbeierl@attglobal.net> wrote:
>> 
>> Osram DE3423 LED festoon lamp is one watt.  If you want ten seconds 
>> of fading light at average half brightness that would require 
>> something like five watt seconds of storage in your capacitor.  Say 
>> six or seven because of the threshold voltage of the LED.  WS = C x 
>> V^2 / 2, so C = WS / (V^2 / 2).  So C = 7 ws / (12V^2 / 2) = 7 / 72 = ~0.1 farad or 100,000 uF.
>> 
>> Here's one that would serve.  It's nominal 40 mm diameter and 80 mm 
>> length, and it costs ten bucks US in onesies.
>> https://www.digikey.com/product-detail/en/united-chemi-con/ESMH160VSN
>> 104MA80T/565-2624-ND/757837
>> 
>> Yrs,
>> d
>> 
>> 
>> 
>>> On Wed, Aug 2, 2017 at 1:32 PM, Neil N <musomuso@gmail.com> wrote:
>>> 
>>> Thats great! So about 5 seconds eh? I'd think that for a festoon the
>>> cap(s) would have to be much bigger. But maybe 3 of those small 
>>> LED's would be plenty?
>>> 
>> 
> 
> 
> --
> Neil n
> 
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