wig wag system for horn?

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Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=132174
Printed Date: May 15, 2025 at 9:45 PM

Topic: wig wag system for horn?

Posted By: skampy4ever
Subject: wig wag system for horn?
Date Posted: September 12, 2012 at 3:33 PM

Sorry for my english here :
I'm trying to come up with a 12 volts circuit that would allow me to alternate two car horn at the push of a button. Kind of a wig-wag system but horn replacing the lights... (usually called a "Attention-getter")

I've heard about using a flasher and a relay or something like that...

Any idea how to proceed ? a diagram would be good posted_image

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==Skampy4ever==

Replies:

Posted By: oldspark
Date Posted: September 12, 2012 at 4:25 PM

A 555 or any astable circuit with its output driving 2 relays; one with coil to +12V the other's coil to GND.
The output has to be capable of sourcing and sinking the coil currents.

Posted By: tommy...
Date Posted: September 12, 2012 at 4:36 PM

https://www.the12volt.com/relays/relaydiagram59.html

https://www.the12volt.com/relays/relaydiagram58.html

This is what is used for Lights...

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M.E.C.P & First-Class
Go slow and drink lots of water...Procrastinators' Unite...Tomorrow!

Posted By: oldspark
Date Posted: September 12, 2012 at 4:41 PM

Noting that some (older...) flasher cans require a high load (eg, 50W) else may not flash.

But it's easy enough to try...

Posted By: skampy4ever
Date Posted: September 13, 2012 at 10:01 PM

might try the second one thanks :)

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==Skampy4ever==

Posted By: tommy...
Date Posted: September 14, 2012 at 8:34 AM

You're Welcome... And I think that your English is pretty good, especially after someone says" Sorry for my English"... posted_image

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M.E.C.P & First-Class
Go slow and drink lots of water...Procrastinators' Unite...Tomorrow!

Posted By: skampy4ever
Date Posted: September 14, 2012 at 9:41 AM

thanks :)

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==Skampy4ever==

Posted By: skampy4ever
Date Posted: September 14, 2012 at 6:19 PM

Another questions here...
Would it be possible to modify the flashing rate by using some sort of a potentiometer or something else ? So I would be able to make it alternate faster or slower.

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==Skampy4ever==

Posted By: oldspark
Date Posted: September 14, 2012 at 11:05 PM

No - not if using a flasher can.

But yes if using an astable timing circuit - eg, a 555 timer etc.

Posted By: skampy4ever
Date Posted: September 15, 2012 at 3:29 PM

So how would that work ?

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==Skampy4ever==

Posted By: oldspark
Date Posted: September 15, 2012 at 7:44 PM

doctronics.co.uk - 555 astable

wikipedia - 555 timer IC

or google "555 astable".

Posted By: skampy4ever
Date Posted: September 16, 2012 at 8:56 PM

My grand father told me that when he was young he used todo the same but using only a flasher with 3 pin (one 12v input and 2 output)...
But how would I wire that ?

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==Skampy4ever==