ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Increasing demand factors in residential
by tortuga - 03/28/24 05:57 PM
Portable generator question
by Steve Miller - 03/19/24 08:50 PM
Do we need grounding?
by NORCAL - 03/19/24 05:11 PM
240V only in a home and NEC?
by dsk - 03/19/24 06:33 AM
Cordless Tools: The Obvious Question
by renosteinke - 03/14/24 08:05 PM
New in the Gallery:
This is a new one
This is a new one
by timmp, September 24
Few pics I found
Few pics I found
by timmp, August 15
Who's Online Now
0 members (), 260 guests, and 19 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Page 1 of 3 1 2 3
#59674 12/12/05 09:57 PM
Joined: Apr 2002
Posts: 197
T
triple Offline OP
Member
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.

#59675 12/12/05 10:19 PM
Joined: Dec 2004
Posts: 1,064
D
Member
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).]

#59676 12/12/05 11:21 PM
Joined: Apr 2002
Posts: 197
T
triple Offline OP
Member
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.

#59677 12/13/05 12:00 AM
Joined: Dec 2005
Posts: 25
J
Member
$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.-

#59678 12/13/05 12:06 AM
Joined: Feb 2002
Posts: 375
G
Member
Computer power supplies have lots of 12v power and run under $30.
http://www.newegg.com/Product/Product.asp?Item=N82E16817148027#DetailSpecs

#59679 12/13/05 12:37 AM
Joined: Nov 2005
Posts: 827
Likes: 1
J
Member
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).]

#59680 12/13/05 01:41 AM
Joined: Jul 2004
Posts: 9,923
Likes: 32
G
Member
George is on the right track. 10a out of a PC supply isn't that hard to find, probably <$10 on Ebay.


Greg Fretwell
#59681 12/13/05 08:00 AM
Joined: Nov 2000
Posts: 2,148
R
Member
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)
#59682 12/13/05 08:23 AM
Joined: Sep 2001
Posts: 806
N
Member
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.

#59683 12/13/05 11:11 AM
Joined: Jul 2004
Posts: 9,923
Likes: 32
G
Member
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
Page 1 of 3 1 2 3

Link Copied to Clipboard
Powered by UBB.threads™ PHP Forum Software 7.7.5