ECN Forum Forums General Topics of the Trade General Discussion Area 120VAC to 12VDC

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.

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).]

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.

$85 for a 120 Watts Switching-mode DC power supply is not too much.

This one http://www.jameco.com/webapp/wcs/st...amp;catalogId=10001&productId=540728 is a linear power supply which cost $70, and is not for DIN mounting.

Joe.-

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

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_...UPPLY_1_DC_POWER _SUPPLY_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).]

George is on the right track. 10a out of a PC supply isn't that hard to find, probably <$10 on Ebay.

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

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.

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