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 want to run dc 12v 1.3A motor from AC (240v) sup		  New Topic  Reply to Topic
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sanjeevrk
New Member

India
2 Posts
Posted - Nov 02 2009 :  01:50:07 AM  Show Profile  Reply with Quote
Hi

i have got a DC fan (12V, 1.3A) and would love to use the same using AC power (220-240V), can you please tell me how i can run this using AC power, if possible the circuite for the same pls

Darkthero
Apprentice

USA
51 Posts
Posted - Nov 02 2009 :  04:56:26 AM  Show Profile  Reply with Quote
ok you cant directly plug your 12v to 120/240 because it will burn it up. what you can do is buy or make a adapter that will step down the voltage to 12v and regulate it to DC. something like this http://www.shopaddonics.com/itemdesc.asp?ic=AAPAC12V-US or if u want to make here is the schematic and discription http://www.allaboutcircuits.com/worksheets/supply1.html
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Aaron Cake
Administrator

Canada
6718 Posts
Posted - Nov 02 2009 :  09:48:03 AM  Show Profile  Visit Aaron Cake's Homepage  Send Aaron Cake an ICQ Message  Send Aaron Cake a Yahoo! Message  Reply with Quote
The easiest approach would be to use a 12V wall adapter with the appropriate current ratings. You can buy them cheaply at surplus stores.

Failing that, all you need is a 12V transformer and a rectifier. Motors don't particularly care how clean the supply is to them, so you don't need to bother filtering and regulating it.
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sanjeevrk
New Member

India
2 Posts
Posted - Nov 03 2009 :  12:42:24 AM  Show Profile  Reply with Quote
thanks aaron cake and darkthero,

Aaron cake does this 12V transformer and a rectifier have any specific size?
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Darkthero
Apprentice

USA
51 Posts
Posted - Nov 03 2009 :  06:40:26 AM  Show Profile  Reply with Quote
I think i can answer that. what i would use is a 3or more amp transformer and a bridge rectifier rated at 300v 4amps. hope this helps
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Darkthero
Apprentice

USA
51 Posts
Posted - Nov 03 2009 :  06:42:41 AM  Show Profile  Reply with Quote
in the post ^above^ i think i meant 2amp will be fine for the transformer.
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pebe
Nobel Prize Winner

United Kingdom
1078 Posts
Posted - Nov 03 2009 :  07:10:45 AM  Show Profile  Reply with Quote
Darkthero,

The voltage rating of your rectifier is far higher than necessary.
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Darkthero
Apprentice

USA
51 Posts
Posted - Nov 03 2009 :  07:15:56 AM  Show Profile  Reply with Quote
well i said 300v because i never seen a 240v rectifier
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audioguru
Nobel Prize Winner

Canada
4218 Posts
Posted - Nov 03 2009 :  08:25:57 AM  Show Profile  Reply with Quote
The rectifier is on the 12V side of the transformer so 25V or 50V rating is fine.
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Aaron Cake
Administrator

Canada
6718 Posts
Posted - Nov 03 2009 :  09:28:24 AM  Show Profile  Visit Aaron Cake's Homepage  Send Aaron Cake an ICQ Message  Send Aaron Cake a Yahoo! Message  Reply with Quote
Yeah, transformers don't work too well on DC.

If it is a universal type motor, it will also work on 12V AC, for what it's worth.
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Darkthero
Apprentice

USA
51 Posts
Posted - Nov 04 2009 :  04:56:53 AM  Show Profile  Reply with Quote
oops i see i made a mistake sorry
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