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-   -   convert +12 to +/-12 (http://www.diyaudio.com/forums/power-supplies/216846-convert-12-12-a.html)

ExtraCredit1 26th July 2012 09:44 PM

convert +12 to +/-12
 
I need to power the 12v section of the IcePower 200AC from a +12 source but the amp needs a +/-12 source.

Is there a converter that can convert +12v to +/-12v DC?

Thanks!

Mike

ExtraCredit1 27th July 2012 12:51 AM

I am actually converting 48v to 12v with a DC to DC converter. but I need -12/0/+12

Would a transformer from 48v to two 12 volts work? does that exist?

Mike

jackinnj 27th July 2012 01:38 AM

You can configure a switch mode dc-dc converter to yield a negative voltage -- Texas Instruments now has the National Semi "Simple Switcher' line of smps converters and the details are on their website.

ExtraCredit1 27th July 2012 01:51 AM

Thanks for the reply!!

I looked at them and honestly its way over my head. Is there a part I can buy that is plug and play or would I need to create a whole circuit from scratch?

Mike



Quote:

Originally Posted by jackinnj (Post 3105833)
You can configure a switch mode dc-dc converter to yield a negative voltage -- Texas Instruments now has the National Semi "Simple Switcher' line of smps converters and the details are on their website.


DUG 27th July 2012 02:37 AM

You did not mention how much current you needed.

here is a 48V to +/- 12 V part from Digi-Key

1W is about 43mA

Digi-Key Part Number 811-2177-5-ND
Price Break Unit Price Extended Price
1 7.95000 7.95
5 7.91000 39.55
10 7.85000 78.50

Quantity Available 32
Manufacturer
Murata Power Solutions Inc
Manufacturer Part Number
MEA1D4812SC
Description CONV DC/DC 1KVDC 1W 48 +-12V TH

That part was isolated.

You could also use a 12V in to 12V out isolated and connect the + to gnd, giving a -12V supply.

Digi-Key has 51 of these in stock that range from 21mA to 333mA in output

I would recommend C-L-C filtering for any of these DC-DC converters to get a cleaner DC source.

theAnonymous1 27th July 2012 02:38 AM

Something like this....

NCS6D4812C Murata Power Solutions | Mouser

EDIT: DUG you sneaky ninja. :o

ExtraCredit1 27th July 2012 06:15 AM

Thanks guys!! This is exactly what I needed.

This site Rocks.

Mike

KaffiMann 27th July 2012 07:22 AM

Edit:

Nevermind, captain obvious was here.

eletech 28th July 2012 12:21 AM

Very simple, take two 12V Power supplies. K speaking simple... take the pos from one and the neg from the other join the two wires. Now this is your common(or neg). The power supply with the red left over is your +12 the power supply with the black is your -12. Common is still the two connected wires.

ChrisA 28th July 2012 02:00 AM

Quote:

Originally Posted by ExtraCredit1 (Post 3105641)
I need to power the 12v section of the IcePower 200AC from a +12 source but the amp needs a +/-12 source.

Is there a converter that can convert +12v to +/-12v DC?

You will need to build a switching mode power supply. Basically you "chop" the 12VDC to make a high frequency AC then this goes to the transformer and after that it rectified and filtered. This kind of power supply is hard to design but there are chips for this that reduce the componenet count, but still yu must understand switch mode power supplies if you are going to build one.

Is mains AC available? if so simply buy the correct center tapped transformers. they are not expensive if you only need one amp or less


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