David Jenkins
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| posted on 17/12/09 at 08:02 PM |
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Automotive 12v DPDT relays?
Anyone know where I can find some automotive-grade DPDT relays at a sensible price? I'll need a contact rating of 10A (or better). Oh - I need
two!
I've found a non-auto-grade relay on Rapid's site, but I wonder about its durability in a car.
Notes:
DPDT = double-pole double-throw - 2 sets of change over contacts.
Automotive grade = suitable for working in a dirty, vibrating environment using a power supply that's full of spikes etc.
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rusty nuts
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| posted on 17/12/09 at 08:06 PM |
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Vehicle wiring products, your local Durite stockist's or possibly Stafford Vehicle Components? Could you use 2 relays if you get stuck?
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britishtrident
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| posted on 17/12/09 at 08:09 PM |
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Likely you end up using 4 relays.
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David Jenkins
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| posted on 17/12/09 at 08:12 PM |
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I'd rather not use 4 relays - that will just makes a simple circuit too complicated! And inelegant...
I've looked at VWP and SVC (and a lot more) without success.
If it comes to it I'll just use non-auto relays - the most durable I can find.
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flibble
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| posted on 17/12/09 at 11:00 PM |
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Maplins or RS catalogue may have some but might be wrong sort of connectors?
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mad4x4
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| posted on 18/12/09 at 07:31 AM |
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What about up to the scrappy and pull a few out a fordy fuse box ....?
Along as you don;t exceed the current and voltage and relay should last long enough as long as it is kept "dry" (well with in reasons)
[Edited on 18/1212/09 by mad4x4]
Scot's do it better in Kilts.
MK INDY's Don't Self Centre Regardless of MK Setting !
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David Jenkins
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| posted on 18/12/09 at 07:40 AM |
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quote:
Originally posted by mad4x4
What about up to the scrappy and pull a few out a fordy fuse box ....?
Along as you don;t exceed the current and voltage and relay should last long enough as long as it is kept "dry" (well with in reasons)
[Edited on 18/1212/09 by mad4x4]
You're probably right - I was thinking last night that a couple of sturdy relays mounted on a PCB could be put in a box, which would protect it
from most things. They're going to be on the passenger side of the firewall, so damp would be the biggest risk.
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t16turbotone
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| posted on 18/12/09 at 08:33 AM |
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http://www.zettlerauto.com/products/
AZ935 should do the trick
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David Jenkins
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| posted on 18/12/09 at 04:40 PM |
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Thanks to everyone - I found something suitable on The Bay of E this afternoon...
PCB mounting 12v low-profile DPDT relays, 8A contacts, sealed case.
(I know I said 10A, but 8A will suffice - I'll include a 7.5A fuse in the supply line, just to be sure!  )
[Edited on 18/12/09 by David Jenkins]
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Angel Acevedo
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| posted on 19/12/09 at 02:22 PM |
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Vibration Resistant Relays
You may use Solid State relays from RS. These will be as Vibration and Moisture Resistant as can be.
Beware of what you wish.. for it may come true....
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David Jenkins
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| posted on 19/12/09 at 03:29 PM |
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Angel - I think I've got what I need.
Now another question - what width track do I need on a PCB to carry up to 7.5 - 8A max current, typical 4A? I'm talking about general-purpose
PCB here, not 'specially thick copper' sort of stuff.
[Edited on 19/12/09 by David Jenkins]
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iank
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| posted on 19/12/09 at 06:36 PM |
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quote:
Originally posted by David Jenkins
Now another question - what width track do I need on a PCB to carry up to 7.5 - 8A max current, typical 4A? I'm talking about general-purpose
PCB here, not 'specially thick copper' sort of stuff.
Ask and the internet will provide
http://desmith.net/NMdS/Electronics/TraceWidth.html
One cheat, if you don't care much for the looks, is to solder tinned copper wire along the PCB trace to make your own extra thick tracks.
[Edited on 19/12/09 by iank]
--
Never argue with an idiot. They drag you down to their level, then beat you with experience.
Anonymous
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David Jenkins
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| posted on 19/12/09 at 06:58 PM |
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quote:
Originally posted by iank
quote:
Originally posted by David Jenkins
Now another question - what width track do I need on a PCB to carry up to 7.5 - 8A max current, typical 4A? I'm talking about general-purpose
PCB here, not 'specially thick copper' sort of stuff.
Ask and the internet will provide
http://desmith.net/NMdS/Electronics/TraceWidth.html
One cheat, if you don't care much for the looks, is to solder tinned copper wire along the PCB trace to make your own extra thick tracks.
[Edited on 19/12/09 by iank]
Perfick! 
Just what I need. Most of my planned board will have very wide tracks, but there are one or two places where it gets a bit tight...
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rusty nuts
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| posted on 24/12/09 at 06:55 PM |
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David , you have u2u
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