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Old 24th June 2005, 07:48 PM   #1
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Default 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?
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Hans
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Old 24th June 2005, 07:57 PM   #2
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How much current? Maybe a dc-dc convertor?
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Old 24th June 2005, 08:02 PM   #3
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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.
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Hans
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Old 24th June 2005, 08:31 PM   #4
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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.
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Old 24th June 2005, 09:32 PM   #5
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Like this?
http://www.jameco.com/webapp/wcs/sto...oductId=217111
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Old 25th June 2005, 08:27 AM   #6
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That looks like a good solution.
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Old 25th June 2005, 10:33 AM   #7
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For $30, surely it would be easier just to build a proper one from scratch?
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Old 25th June 2005, 12:55 PM   #8
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Go to the national Semi web site. You put in the requirements and the site designs the supply you need.
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Old 25th June 2005, 01:54 PM   #9
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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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Old 25th June 2005, 02:07 PM   #10
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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.
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