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hooking diodes across relay leads


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morebassplease 
Member - Posts: 4
Member spacespace
Joined: June 28, 2004
Location: United States
Posted: July 04, 2004 at 3:11 PM / IP Logged  

i use a lot of relays in my car to power neons, strobes, and other fun stuff. i've read that u should hook a diode across the leads (no idea which ones). i know how a diode works but why would i need it and which type of diode do i use, or are they all the same and any would work fine? thanks.

defective 
Silver - Posts: 642
Silver spacespace
Joined: August 20, 2003
Location: Canada
Posted: July 04, 2004 at 5:15 PM / IP Logged  

https://www.the12volt.com/relays/relays.asp

just read this... it explians

HotRod53F100 
Copper - Posts: 84
Copper spacespace
Joined: May 12, 2002
Location: United States
Posted: July 06, 2004 at 8:53 PM / IP Logged  
Remember the little hand shockers or the old tinfoil on the edge of a book with a battery inside trick? Maybe I'm dating myself..LOL These both worked on the principal that a diode across a contact eliminates. A diode eliminates the "inductive kickback" that would weld a relay contact or blast a sensative unit. A colapsing field has nowhere to go when disconnected and it generates a kickback many times higher than what you were drawing. You will also see a device called a "transorb" which does the same thing.

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