Quote:
Originally Posted by carma143
I'm a freshman EE major, and right now I don't really have the time to figure it out all right now (more like I'm too lazy to  But hey, that's true with nearly all engineers. It's usually the defining characteristic that makes us do what engineers do.)
If you have the time, patience, and knack for these kinds of things, then why don't you set up your own circuit using a bread board, maybe using 2 different buzzers in place of the stock and modified horn. Test it out. Have fun.  |
Heh. I'm an aerospace engineering major, so I know all about that :P
I was considering building a practice circuit, but I figured I'd ask first before I start wasting money on parts unnecessarily, lol.
Quote:
Originally Posted by bcj
Not E/E.
I have been told however, that a compressor type horn will require heavier gauge wiring for that circuit and added relay.
Probably directly from the battery rather than anywhere on the existing loom.
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It isn't compressor DRIVEN in that sense. These horns require a dedicated, pressurized air supply. There will be a Viair compressor charging a 2 gallon air tank, but that will be a separate wiring setup, and yes, that will use heavy-gauge wire running straight from the battery. To activate the horns, I just need to trigger a solenoid valve.
Quote:
Originally Posted by jvincent
Caveat, I'm an EE but my field is semiconductors and it's been a loooooooooong time since I had to look at relays.
You polar terminology confused me. Normally relays are referred to as NC (normally closed) or NO (normally open). As drawn, the stock setup is normally open and when you energize the relay it closes.
I think the simplest solution would be add the new horn using the same type of circuit as the stock one. Then just have your selector switch choose to energize one or the other relays.
EDIT: I'm assuming here that the 12V supply you connect can sufficiently feed the new horn.
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I guess I should have better described my end goal:
The stock system uses a relay to trigger a direct-from-the-battery +12v feed to the horns (as drawn in my diagram, all the +12V sources start at the battery in some form.)
What I want to do is be able to redirect that 12v to either the stock horns, or the solenoid valve that opens the air line. To do that, I don't want to use a MOMENTARY relay. I want a relay that only requires a momentary current to FLIP it and then it will STAY in that position. That way I don't need a permanent 12V feed to the relay. It will either be permanently set to route to the stock horns, or permanently set to route to the solenoid.
I'm pretty sure that makes sense, I just don't know what the terminology is. What you say makes sense with NC vs NO (the polar stuff confused me too), but I think what I'm looking for is a relay that is NC in either one state or the other. So it's either closed one way, or close the other, but never open.