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first post, dual source relay control?


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KPierson 
Platinum - Posts: 3,527
Platinum spaceThis member consistently provides reliable informationspace
Joined: April 14, 2005
Location: Ohio, United States
Posted: May 22, 2008 at 6:47 PM / IP Logged  

You could do that, but stripes arn't that hard to figure out!

Plus, you would need to find an LED that has a current capacity of at least 150mA.  That may not be easy to do, especially at Radioshack.  If you try to add a current limiting resistor (or a 12vdc LED) you won't have enough current left over to energize the relay.  Just get the diodes, its the "right" way to do it and you don't have to worry about blowing things up by running too much current to them!

Kevin Pierson
wyatt earp 
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Joined: May 20, 2008
Location: British Columbia, Canada
Posted: May 22, 2008 at 8:55 PM / IP Logged  

Thanks guys. I don't want to split hairs here. I'm just trying to learn how to do it beyond just plugging in a 85 and a 30 (basic stuff). I need to find a way to draw and post here on line without dealing with my idiot scanner.

Any ideas?

Wyatt Earp
Just another Diesel Performance Nut
astrosurfer 
Member - Posts: 49
Member spacespace
Joined: July 24, 2006
Location: Louisiana, United States
Posted: May 23, 2008 at 9:26 PM / IP Logged  
this can easily be done with a 5 pin relay...
closed normally would be your transmission circuit + or -.
closed energised should be your manual override circuit.
basically you would be just changing the feed to the lights.
wire the switching terminals to 12V and imagine it like train tracks.
i don't see the need for diodes to make this work.
just my $0.02
KPierson 
Platinum - Posts: 3,527
Platinum spaceThis member consistently provides reliable informationspace
Joined: April 14, 2005
Location: Ohio, United States
Posted: May 24, 2008 at 2:27 AM / IP Logged  

A $4 dollar relay or $0.99 in diodes - they both will work, but the diodes are a bit more simplistic, have a lower cost, and a lower failure rate.

Diodes are isolation devices and relays can be used as isolation devices.

If it were my car i would go diodes!

Kevin Pierson
wyatt earp 
Member - Posts: 9
Member spacespace
Joined: May 20, 2008
Location: British Columbia, Canada
Posted: May 24, 2008 at 11:19 AM / IP Logged  

So, what you are saying is that if I turn the relay polarity around (the 87 and 87a would be inputs not outputs) that this should work with a normal 5 pin? Sounds simple enough. I didn't know you could do that to be honest.

Thanks

Wyatt Earp
Just another Diesel Performance Nut
i am an idiot 
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Joined: September 21, 2006
Location: Louisiana, United States
Posted: July 27, 2008 at 9:54 AM / IP Logged  

first post, dual source relay control? - Page 2 -- posted image.

The switch on the left of the picture is an On-Off-On Single Pole Double Throw switch.

Page of 2

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