Darrylh
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Registered: 2nd Feb 03
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Hi all,
Do you know in the Merc and BMW's when they close there doors, the light stays on for about 20 seconds and then dims off.
Well i want to build one of these for the Corsa B here in South Africa.
Does anybody know how to do this?
Does anybody have any circuit diagrams for this?
Thanks
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Mikorsa16v
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Registered: 2nd Sep 02
Location: Burgess Hill, West Sussex
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i think it has been covered before, not too tricky, but if you have an alarm which uses the courtesy light then the alarms' functions may not work, as in it might not turn it not when you deactivate it and so on
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Darrylh
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Registered: 2nd Feb 03
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hi,
What sould i search for, as i can't find bollocks here about this.
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jrsteeve
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Registered: 3rd Apr 02
Location: Manchester
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The corsa c has this, so if you have any scrap yards where you are - if u have the corsa c - u could get the parts from it.
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Darrylh
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Registered: 2nd Feb 03
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Scrap yards don't even have the old Corsa B in "Stock", let alone the Corsa C.
I wanna build this myself, so if you have any circuit or links to site, now is the time the paste them in this post.
Thanks
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Darrylh
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Registered: 2nd Feb 03
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Anybody know how to build on of these ?????
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c0r5a_gsi
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Registered: 17th Jul 02
Location: Gloucestershire
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could you not just put a cap inline with the power to the light, so it would just stay on until the cap had discharged, and maybe fade out ?
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kev_corsa
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Registered: 7th Nov 02
Location: Newport, Uni in Bristol
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u have to put a capacitor in parallel with the load (in this case the bulbs)
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adelcorsa
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Registered: 21st Apr 03
Location: ipswich
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in my alarm when i dis arm it puts the light on till i start the engine up then it turns it off
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Darrylh
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Registered: 2nd Feb 03
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i have tried that, i have put two 3300 uF 16V Capacitors in parralel with the bulb, and when you cut the power, it dies instantly. What specs cap must i use ?
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jm960326
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Registered: 24th Aug 02
Location: Rob Cheshire
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Try a 3300uF capacitor in line with the bulb, you then need to use a resistor to diapate the charge. This value will alter discharge time. Use a 1kohm resistor, link this across the capacitor. Not sure if directly across it or link one end to ground. Time for light to stay on until not current is flowing should be aprox 16s but it'll look dimmer well before that.
T=RC for time constant, 63% of charge discharged.
Make sure you put the capacitor in the right way too otherwise you'll blow it up!
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baza31
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Registered: 19th Apr 03
Location: yorkshire
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Where would you buy that stuff? anywhere online?
where does the resistor go? b4 the cap, or inbetween the cap and the bulb?
[Edited on 11-05-2003 by baza31]
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Mikorsa16v
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Registered: 2nd Sep 02
Location: Burgess Hill, West Sussex
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www.maplin.co.uk
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baza31
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Registered: 19th Apr 03
Location: yorkshire
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k, thanks, but where does the resistor go??
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c0r5a_gsi
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Registered: 17th Jul 02
Location: Gloucestershire
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at a guess I would say in between cap and bulb, I presume it would resist some of the charge in the cap, therefore making is last longer.
*Just a guess, I ain't no electrican or anything* 
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jm960326
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Registered: 24th Aug 02
Location: Rob Cheshire
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Nope wrong there above! Sorry.
The resistor is there to discharge the capacitor. As said use T=RC equation. this is for 63% discharge. Multiply by 5 for aproximate full discharge. Pu the resistor across the capacitor, that should work.
Right, will get loads of capacitors and resistors tomorrow and try it, give exact details if people want??
U2U or post, I'll have it sorted tomorrow no doubt. 
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baza31
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Registered: 19th Apr 03
Location: yorkshire
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cool. u2u me wot results u get
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jm960326
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Registered: 24th Aug 02
Location: Rob Cheshire
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Not had chance look yet but will try get it done this week and post up to everyone.
R
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Darrylh
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Registered: 2nd Feb 03
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i spoke to an electrican, and not possible with a cap and a resistor.(please prove me if i am wrong with diagrams and specs  )
He said that you would need a massive Cap, 44000 uF to release 12 volt over 30 seconds. Best is to get a Delayed Off circuit timer.
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jm960326
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Registered: 24th Aug 02
Location: Rob Cheshire
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Will have a look at it soon see if I can get it done, but yep has electrician says, delay circuit timer is the way, really easy do that is aswell, just costs a bit more.
High capacitor required as its the current output afterwards that is required.
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boxmasher
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Registered: 8th Mar 03
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i saw a kit in my local motor factors on saturday, cost about £1.50 and was two wires and a black thing.
called summat like a light delay timer or summat.
didnt buy one coz dont need it but it might help anyone who is interested.
ben
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Darrylh
Member
Registered: 2nd Feb 03
User status: Offline
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Unless you going to buy me one (B-day present???) and send it to me via Mail here in South Africa?
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S21NMP
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Registered: 4th Feb 03
User status: Offline
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I have made and I'm thinking of selling such a device on my new website: www.corsamods.co.uk.
If anyones interested, send me a message at neil@corsamods.co.uk
http://www.corsamods.co.uk
The device slowly fades the light after about 5 seconds when you shut the door.
[Edited on 14-05-2003 by S21NMP]
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