12-21-2009, 05:28 AM
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Member of the north
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Join Date: May 2003
Cobra Make, Engine: A Cobra
Posts: 11,207
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Generally, we use a diode on relays that are driven.
An open collector driver where the relay acts as Rc, should have a diode placed across the coils or after a period of time, a nice hole will get blown through the transistor.
You do not need a diode for switch driven relays.
Just my $0.02 worth.
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