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Arthur
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Joined: 05/03/2009
Location: United Kingdom
Posts: 28

Posted: 10:59am 13 Mar 2009

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Hi, I want to operat a 24 volt relay off 12 volts, I remember in the distant past I used to do this unforrtunatly all my notes and circuits as well as the house were distroyed by fire. I would prefer that it's done without using another relay. thanks Arthur

9c12m
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Joined: 04/09/2007
Location: Australia
Posts: 28

Posted: 11:47am 13 Mar 2009

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There is a cct that might be of some interest at:

http://www.geocities.com/SiliconValley/pines/5440/relay.html

Arthur
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Joined: 05/03/2009
Location: United Kingdom
Posts: 28

Posted: 12:22pm 13 Mar 2009

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Thank you very much for the info that chap has some awsome stuff ion his web site

Arthur

catchnthe-))))

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Joined: 03/01/2009
Location: United States
Posts: 24

Posted: 10:05pm 21 Mar 2009

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I have a similar condition. I have 12 volt relay, coil
that energizes and 50 amp set of contacts. I would like to control a 24 volt circuit using this 12 volt unit.

any help appreciated.

Chuck

Freedom allows us a lot "Please don't abuse."

CraziestOzzy

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Joined: 11/07/2008
Location: Australia
Posts: 135

Posted: 12:02am 22 Mar 2009

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You will need to protect for in rush current, use a cap to prevent carbon burn on your relay allowing for longer life.
I would recommend using 12volt DC relays taken out of a car/truck, as they are usually high current 12/24 volt combos. Wiring details are usually straightforward and marked on the case.

http://cr4.globalspec.com/member?u=25757

http://www.instructables.com/member/OzzyRoo/

catchnthe-))))

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Joined: 03/01/2009
Location: United States
Posts: 24

Posted: 04:34am 22 Mar 2009

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CraziestOzzy,

Thanks,for the info.the relays I have now are Automotive
Bosh HD. will a condenser from the old style car points system work.I am asuming attaching it to inlet side of contact.

Thanks,
Chuck

Freedom allows us a lot "Please don't abuse."

CraziestOzzy

Senior Member

Joined: 11/07/2008
Location: Australia
Posts: 135

Posted: 10:20am 22 Mar 2009

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catchnthe-)))) said ...will a condenser from the old style car points system work.I am assuming attaching it to inlet side of contact. Thanks,
Chuck

Yeah it would work, with reservations...as long as it is rated for the current experienced. I would prefer going over the rated current only to prolong life of your relay.
Have the condenser as close as possible to relay and as far as where to attach your condenser, the polarity should be marked on the condenser if it electrolytic or not.
I would recommend personally the use of the standard electrolytic capacitor you typically see on electronic PCB boards (correct sub-family of course) with the typical few components of added circuitry for relay protection in the case of your application.
Google has buckets of info and examples if you go this way.
Cheers.

http://cr4.globalspec.com/member?u=25757

http://www.instructables.com/member/OzzyRoo/

catchnthe-))))

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Joined: 03/01/2009
Location: United States
Posts: 24

Posted: 02:49pm 05 Apr 2009

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Removed and started New thread.
thanks,ChuckEdited by catchnthe-)))) 2009-04-07

Freedom allows us a lot "Please don't abuse."

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