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#59674 - 12/12/05 05:57 PM 120VAC to 12VDC
triple Offline
Member

Registered: 04/01/02
Posts: 182
Loc: Wisconsin
Where can I get a transformer to convert 120VAC to 12VDC. A minimum of 10A of DC current is required. I don't need any type of housing or cords/wires. Open/exposed terminals on a transformer I can place inside a box is fine.

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#59675 - 12/12/05 06:19 PM Re: 120VAC to 12VDC
Dnkldorf Offline
Member

Registered: 12/12/04
Posts: 1091
Loc: nowhere usa
If you need 12VDC, you need a power supply with caps and circuitry. Google a 12vdc power supply.
http://www.powersupplydirect.com/ProductList.aspx?CategoryID=2998

Dnk...

[This message has been edited by Dnkldorf (edited 12-12-2005).]

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#59676 - 12/12/05 07:21 PM Re: 120VAC to 12VDC
triple Offline
Member

Registered: 04/01/02
Posts: 182
Loc: Wisconsin
Thanks Dnkldorf.
That is what I am looking for but the cost is much higher than I expected. Isn't it normally more "expensive" to convert from 12VDC to 120VAC than vise-versa? I'm sure the unit you showed me is of much higher quality than the "cheapy" 12VDC inverters at the big chain stores. However, for the same price, I can get one of those to convert DC to AC (same VA). Are there also "cheapy" versions of AC to DC converters? This is not for a job so top quality is not a necessity.

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#59677 - 12/12/05 08:00 PM Re: 120VAC to 12VDC
Joe of NJ Offline
Member

Registered: 12/05/05
Posts: 24
Loc: West Orange, NJ, USA
$85 for a 120 Watts Switching-mode DC power supply is not too much.

This one http://www.jameco.com/webapp/wcs/stores/...roductId=540728 is a linear power supply which cost $70, and is not for DIN mounting.

Joe.-

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#59678 - 12/12/05 08:06 PM Re: 120VAC to 12VDC
George Offline
Member

Registered: 02/23/02
Posts: 380
Computer power supplies have lots of 12v power and run under $30.
http://www.newegg.com/Product/Product.asp?Item=N82E16817148027#DetailSpecs

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#59679 - 12/12/05 08:37 PM Re: 120VAC to 12VDC
JoeTestingEngr Offline
Member

Registered: 11/04/05
Posts: 786
Loc: Chicago, Il.
Here's a 150W switcher from MPJA 12V, 12.5A <$50.00
I buy alot of stuff from these folks and always get their email specials.
Joe
http://www.mpja.com/category/Power_Suppl...LY_16020_PS.asp

If you want to do your own rectifier, filter, & regulator, here is the 24VCT, 10A TX that they sell for $17.99 http://www.mpja.com/category/Transformers/24V_CT_(12-0-12)10A_TRANSFORMER_7846_TR.asp
[This message has been edited by JoeTestingEngr (edited 12-12-2005).]

[This message has been edited by JoeTestingEngr (edited 12-12-2005).]

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#59680 - 12/12/05 09:41 PM Re: 120VAC to 12VDC
gfretwell Offline

Member

Registered: 07/20/04
Posts: 9045
Loc: Estero,Fl,usa
George is on the right track. 10a out of a PC supply isn't that hard to find, probably <$10 on Ebay.
_________________________
Greg Fretwell

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#59681 - 12/13/05 04:00 AM Re: 120VAC to 12VDC
resqcapt19 Offline
Member

Registered: 11/10/00
Posts: 2209
Loc: IL
 Quote:
Where can I get a transformer to convert 120VAC to 12VDC.

Just so some readers are not confused, you can't use a transformer to change AC to DC.
Don
_________________________
Don(resqcapt19)

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#59682 - 12/13/05 04:23 AM Re: 120VAC to 12VDC
NJwirenut Offline
Member

Registered: 09/15/01
Posts: 816
Loc: Bergen County, NJ
A PC power supply, like most switching supplies, will not work without a minimum load on the output. For a PC supply, that load would have to be on the 5V output, not the 12V in order for the supply to start up properly.

$85 seems completely reasonable for an industrial DIN rail power supply like that.

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#59683 - 12/13/05 07:11 AM Re: 120VAC to 12VDC
gfretwell Offline

Member

Registered: 07/20/04
Posts: 9045
Loc: Estero,Fl,usa
NJ, maybe some old PC supplies need a 5vdc load to start (particularly the old IBM PC/AT supply) but I have a buttload of them that don't. I have been using an assortment of PC supplies for bench supplies. They start fine without a load. Some will shut down when the load changed significantly, some don't
_________________________
Greg Fretwell

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