Low voltage relays
 

Do you get relays that operate with about 3V ? It needs to be able to switch 12V

Re: Low voltage relays
 

Baph!! Where are you

Re: Low voltage relays
 

Sorry, I did mean to reply to this not long after it was posted originally.

This will do you fine. Not sure of any other retailers. It'll cope up to 30V DC, but only at 2A.

If that's not suitable, then there's a few details you can give to help me find the right relay.

You say that the relay is to be activated by 3V, are you fussed about the current through the coil (as in the amps that you have on this 3V wire)?

What current are you wanting to give the 12V circuit? Do you want it to be NO or NC? (first one activates 12V when 3V is on, the other deactivates) Are you fussed about the number of contacts?

Re: Low voltage relays
 

yes, but how much current?

You could make a driver circuit with a power transistor to utilise a normal 12v relay if necessary

Re: Low voltage relays
 

The original wiring was only powering a LED at 3.3V. Not sure about the current but I can find out. I want the relay to switch on the sv's standard horn when the LED wiring is live

Re: Low voltage relays
 

ummm this isnt the gps inforad by any chance? :)

Re: Low voltage relays
 

Yup:smt038

Re: Low voltage relays
 

Now I see what you are up to. Mine alerted me to a right devious one today, but it was forward facing luckily.
I'd suggest driving a high frequency sounder or something rather than the horn - it will use low current, horn uses loads, and it might become embarrasing if your horn starts going honk honk honk honk whenever you are in traffic near say a red light camera and stationary

Re: Low voltage relays
 

I need to be able to hear it at high speed. I'm thinking of putting a switch in with the horn circuit so once it has alerted me I can flick it off. Then when the green LED comes back on I can flick the horn back on

Re: Low voltage relays
 

Why not mount a light under the screen (top of the "dash") - a red LED is eye catching enough even on a summer's bright day.

I know first hand. :)