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14-03-09, 09:30 PM | #1 |
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Low voltage relays
Do you get relays that operate with about 3V ? It needs to be able to switch 12V
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15-03-09, 08:25 PM | #2 |
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Re: Low voltage relays
Baph!! Where are you
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15-03-09, 08:32 PM | #3 |
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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? |
15-03-09, 08:33 PM | #4 |
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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 |
15-03-09, 08:58 PM | #5 |
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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
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15-03-09, 09:07 PM | #6 |
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Re: Low voltage relays
ummm this isnt the gps inforad by any chance?
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15-03-09, 09:08 PM | #7 |
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Re: Low voltage relays
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15-03-09, 09:12 PM | #8 |
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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 |
15-03-09, 09:14 PM | #9 | |
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Re: Low voltage relays
Quote:
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15-03-09, 09:18 PM | #10 |
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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. |
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