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hotwaterwizard: dome delay relay


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Vortec4800 
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Posted: January 17, 2005 at 12:58 AM / IP Logged  
I have here a diagram that you drew up for a dome delay circuit. I'm curious if you know how long this will stay energized after the ignition power is released.
hotwaterwizard: dome delay relay -- posted image.
Also, I'm trying to figure out exactly how the circuit works, and I'm not sure the purpose of the second diode making the loop on the relay. Care to enlighten?
2000 BMW 540i 6 speed
misterjimbo 
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Posted: January 17, 2005 at 12:36 PM / IP Logged  
that depends on the draw from the dome light. if you use it and the delay is or isnt long enough you can always put in a different cap.
misterjimbo 
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Posted: January 17, 2005 at 12:38 PM / IP Logged  
for the diode i think that is to keep the 12volt from backing up through the relay. audiovox relays come with that diode already on them
xetmes 
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Posted: January 17, 2005 at 1:54 PM / IP Logged  
not trying to step on peoples toes but you better put a resistor on the base of the transistor, granted the coil will provide some but a mere 200 ohms or so. The time on is a result of the transistor base current draw but is determined by a resistor (not shown?). Personally I would run an NPN in common emitter or use a PNP to switch the high side since the current in the relay will drag the emitter voltage up, but thats just me...
Vortec4800 
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Posted: January 17, 2005 at 3:50 PM / IP Logged  
Well the draw of the lights shouldn't change the time, because the lights are on the other side of the relay.
As far as the resistor, that is all greek to me. My knowledge in electronics is very basic, and while I always try to understand what's going on adding things isn't my specialty.
2000 BMW 540i 6 speed
xetmes 
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Posted: January 20, 2005 at 3:09 PM / IP Logged  

hotwaterwizard: dome delay relay -- posted image.

Here is another one you can try if you want, should give a delay of about 30 seconds

hotwaterwizard 
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Posted: January 21, 2005 at 1:25 AM / IP Logged  

Have you tried this circuit? I have never seen a 3100 uF Capacitor.

With my 3 min timer you only need 470 uF

hotwaterwizard: dome delay relay -- posted image.

John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
Vortec4800 
Member - Posts: 36
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Posted: January 21, 2005 at 1:29 AM / IP Logged  
Well I only need a 30 second timer. I built the one xetmes drew up, and it clicks on the relay when power to the ign is applied but the voltage to the relay never drops low enough to click the relay off.
2000 BMW 540i 6 speed
hotwaterwizard 
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Posted: January 21, 2005 at 7:30 AM / IP Logged  
try mine with a 47uF cap
John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
hotwaterwizard 
Silver - Posts: 1,350
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Joined: December 11, 2003
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Posted: January 21, 2005 at 7:30 AM / IP Logged  
try mine with a 47uF cap or a 10uF
John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !

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