How to get +15v and -15v from 12vdc

mbcouple · 24th June 2005, 07:48 PM

I have a 12vdc source that fluctuates, and i need a clean +/-15v dc power supply from it. Does anyone have any ideas?
Thanks
Hans

imix500 · 24th June 2005, 07:57 PM

How much current? Maybe a dc-dc convertor?

mbcouple · 24th June 2005, 08:02 PM

Sorry, good point. I dont need very much current. Less than an amp, maybe between 250 and 500mA, more is ok though. I am looking for something i can build, instead of an off the shelf product. I am hoping to keep the cost of the circuit beloew $30 if i can.
Thanks
Hans

richie00boy · 24th June 2005, 08:31 PM

You're looking at a DC-DC converter and you'll need a transformer. I'll be putting a simple design on my website soon, but you need to be able to wind your own little transformer. I'm thinking of getting some made up if there is enough demand.

imix500 · 24th June 2005, 09:32 PM

Like this?
http://www.jameco.com/webapp/wcs/sto...oductId=217111

richie00boy · 25th June 2005, 08:27 AM

That looks like a good solution.

pinkmouse · 25th June 2005, 10:33 AM

For $30, surely it would be easier just to build a proper one from scratch?

Mike Gergen · 25th June 2005, 12:55 PM

Go to the national Semi web site. You put in the requirements and the site designs the supply you need.

DigitalJunkie · 25th June 2005, 01:54 PM

Maybe something like:
http://www.users.qwest.net/~ptaylor/...Neg-supply.jpg

It's a small dc-dc from older Fluke DMM's.
The input is +5V and the output is +/- 15V (theres a 78/7915,thats not in the schematic,along with the + output diodes,and filtering caps.I modified one a bit for another project-only needed a Neg output.)
I'm not sure of the current available,but it's pretty decent.. Maybe 500ma?

richie00boy · 25th June 2005, 02:07 PM

Quote:

Originally posted by pinkmouse
For $30, surely it would be easier just to build a proper one from scratch?

US$30 is around £16.50, consider that you have to source a transformer or parts then wind your own, I think that's cheap not to mention a compact solution. A custom transformer will be easily £15 on it's own.

24th June 2005, 07:48 PM	#1
mbcouple diyAudio Member Join Date: May 2004 Location: Indy	How to get +15v and -15v from 12vdc I have a 12vdc source that fluctuates, and i need a clean +/-15v dc power supply from it. Does anyone have any ideas? Thanks Hans

24th June 2005, 08:31 PM	#4
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	You're looking at a DC-DC converter and you'll need a transformer. I'll be putting a simple design on my website soon, but you need to be able to wind your own little transformer. I'm thinking of getting some made up if there is enough demand. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

25th June 2005, 08:27 AM	#6
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	That looks like a good solution. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

25th June 2005, 10:33 AM	#7
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	For $30, surely it would be easier just to build a proper one from scratch? __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

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24th June 2005, 07:57 PM	#2
imix500 Proud Union Member diyAudio Member Join Date: Mar 2004 Location: Nashville, TN	How much current? Maybe a dc-dc convertor?

24th June 2005, 08:02 PM	#3
mbcouple diyAudio Member Join Date: May 2004 Location: Indy	Sorry, good point. I dont need very much current. Less than an amp, maybe between 250 and 500mA, more is ok though. I am looking for something i can build, instead of an off the shelf product. I am hoping to keep the cost of the circuit beloew $30 if i can. Thanks Hans

24th June 2005, 09:32 PM	#5
imix500 Proud Union Member diyAudio Member Join Date: Mar 2004 Location: Nashville, TN	Like this? http://www.jameco.com/webapp/wcs/sto...oductId=217111

25th June 2005, 12:55 PM	#8
Mike Gergen diyAudio Member Join Date: Sep 2004 Location: Elk River MN	Go to the national Semi web site. You put in the requirements and the site designs the supply you need.

25th June 2005, 01:54 PM	#9
DigitalJunkie diyAudio Member Join Date: Apr 2003 Location: Portland,Oregon Blog Entries: 4	Maybe something like: http://www.users.qwest.net/~ptaylor/...Neg-supply.jpg It's a small dc-dc from older Fluke DMM's. The input is +5V and the output is +/- 15V (theres a 78/7915,thats not in the schematic,along with the + output diodes,and filtering caps.I modified one a bit for another project-only needed a Neg output.) I'm not sure of the current available,but it's pretty decent.. Maybe 500ma?

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