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cap size for relay


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rtm038 
Member - Posts: 41
Member spacespace
Joined: September 26, 2004
Location: United States
Posted: November 17, 2009 at 11:41 PM / IP Logged  

Hello,

After reading a few other posts about adding a capacitor to the coil of a relay that is being controlled by a fading interior dome light in order to eliminate “chatter”, I gave it a try using a 470uF 50V capacitor and it worked perfectly.  However, the actual size (dimensionally speaking) of the capacitor is pretty big.  Is there a smaller size capacitor I could use instead?  The relay is standard 12+vdc Bosch style automotive relay and the capacitor may only have a few seconds to charge up before the interior lights begin to fade out.

Thanks

Ryan

Ween 
Platinum - Posts: 1,366
Platinum spacespace
Joined: August 01, 2004
Location: Illinois, United States
Posted: November 18, 2009 at 5:44 AM / IP Logged  

hi,

try using a 16 volt or 25 volt instead.  and look for a capacitor rated at 105 deg C instead of the usual 85 deg...for longevity.  also if you look into other relays with lower coil currents, your capacitor values/sizes should also be reduced.

m

i am an idiot 
Platinum - Posts: 13,671
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: November 18, 2009 at 6:20 AM / IP Logged  
Also try a 220Mic capacitor.  It too should work. 
keep_hope_alive 
Member - Posts: 14
Member spacespace
Joined: April 29, 2006
Location: United States
Posted: November 18, 2009 at 5:50 PM / IP Logged  
tantilum capacitors are much smaller than electrolytic.
Electrons behave like waves on monday, wednesday, and friday, like particles on tuesday, thursday, and saturday, and like nothing at all on sunday.

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