Alan
To put it really simply you would not need a relay as you will be using
switches to drive the relay, you can do it with just 2 way switches wired in
parallel, (parrallel is OR, series is AND)
input 1 on first switch (2 way switch)
input 2 on second switch (2 way switch)
then for arguments sake wire both sides of the switch to a bulb, then earth
the bulb.
Either switches will turn on the bulb, or both together,
if both are off the bulb will be off
you could do it with a semiconductor logic gate, but 2 switches would do
hope that makes sense
Andy
> Subject: [Healeys] Electrical Question - OR Circuit
>
> To the electrically minded -
>
> I would like to create an "OR" circuit (i.e. OR gate) using standard
> automotive relays (or similar equipment), basically if one or another input
> is on, or both, then the output wire is on. Maybe if I'm lucky someone
> knows of an off the shelf OR relay I can buy?
>
> Any suggestions on how this is easily or simply achieved?
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