Low voltage relays - SV650.org

DarrenSV650S · 14-03-09, 09:30 PM

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

DarrenSV650S · 15-03-09, 08:25 PM

Baph!! Where are you

15-03-09, 08:32 PM

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?

tigersaw · 15-03-09, 08:33 PM

yes, but how much current?

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

DarrenSV650S · 15-03-09, 08:58 PM

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

tigersaw · 15-03-09, 09:07 PM

ummm this isnt the gps inforad by any chance?

DarrenSV650S · 15-03-09, 09:08 PM

Quote:

Originally Posted by tigersaw

ummm this isnt the gps inforad by any chance?

Yup

tigersaw · 15-03-09, 09:12 PM

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

DarrenSV650S · 15-03-09, 09:14 PM

Quote:

Originally Posted by tigersaw

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

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

15-03-09, 09:18 PM

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.

14-03-09, 09:30 PM	#1
DarrenSV650S Member Mega Poster Join Date: Jul 2006 Location: Dundee Posts: 4,407	Low voltage relays Do you get relays that operate with about 3V ? It needs to be able to switch 12V

15-03-09, 08:25 PM	#2
DarrenSV650S Member Mega Poster Join Date: Jul 2006 Location: Dundee Posts: 4,407	Re: Low voltage relays Baph!! Where are you

15-03-09, 08:32 PM	#3
Baph Guest Posts: n/a	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
tigersaw Member Mega Poster Join Date: Mar 2005 Location: Llanwrtyd Wells Powys Posts: 1,146	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
DarrenSV650S Member Mega Poster Join Date: Jul 2006 Location: Dundee Posts: 4,407	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

15-03-09, 09:07 PM	#6
tigersaw Member Mega Poster Join Date: Mar 2005 Location: Llanwrtyd Wells Powys Posts: 1,146	Re: Low voltage relays ummm this isnt the gps inforad by any chance?

15-03-09, 09:12 PM	#8
tigersaw Member Mega Poster Join Date: Mar 2005 Location: Llanwrtyd Wells Powys Posts: 1,146	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, 09:18 PM	#10
Baph Guest Posts: n/a	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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