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constant negative to momentary negative


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rp_guy 
Member - Posts: 7
Member spacespace
Joined: March 20, 2008
Posted: June 23, 2011 at 4:11 AM / IP Logged  
i understand how to build the circuit:
https://www.the12volt.com/relays/relaydiagram43.html
https://www.the12volt.com/installbay/forum_posts.asp?tid=60614
my question is:
i am trying to create a momentary pulse from the GWA wire on a remote starter. either circuit will do it, however, will it continually draw power for the relay after the relay unlatches?
i guess i don't understand how it unlatches due to the capacitor (and doesn't relatch after the capacitor drains).
thanks
rockatansky 
Member - Posts: 1
Member spacespace
Joined: June 23, 2011
Location: Australia
Posted: June 23, 2011 at 5:31 AM / IP Logged  
+1
I'm looking for the same deal here as well. I need a momentary pulse from constant + (and the same thing using constant neg for a second part of the circuit) but I would like to be able to not have power running to the coil all the time.
I'm guessing the solution may be something to do with mixing normally open and normally closed. Just not sure how to wire it.
Cheers
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
Joined: January 09, 2007
Location: United Kingdom
Posted: June 23, 2011 at 7:07 AM / IP Logged  
More costly but simple and more reliable, use a 528t timer relay, you can set the potentiometer from 1-300 seconds, also no latched relay to worry about.
rp_guy 
Member - Posts: 7
Member spacespace
Joined: March 20, 2008
Posted: June 23, 2011 at 3:55 PM / IP Logged  
actually the circuit i have has a 528t in it. so if i have constant neg (GWA wire) on the BLACK/ white trigger, the 528t will only pulse once, and not continuously (until the negative trigger is removed)?
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
Joined: January 09, 2007
Location: United Kingdom
Posted: June 23, 2011 at 4:00 PM / IP Logged  
Exactly. It doesn't matter if you feed the 528t with a momentary or constant, it will only output for the length of time you set it. It needs a REPEAT signal to reset it.
rp_guy 
Member - Posts: 7
Member spacespace
Joined: March 20, 2008
Posted: June 23, 2011 at 4:01 PM / IP Logged  
thanks. exactly what i needed!

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