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Re: dc-dc converters +12V -12V for ISA sound card

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On Wed, 7 Nov 2001  wrote:

> The current draw is relativly low, so a 5V to 12V tiny DC-DC converter
> solves the +12V problem, is there such a thing as a 5V to -12V or -5V
> to -12V DC-DC converter to handle the -12V? Does it go under a
> different name because I can't see any here. Or can I use a 5V to 12V
> one backwards on the -5V to produce -12V?

	There are DC-DC converters that convert to - voltages, yes.  You
can't put a +5 or +12 backwards, though.  It sounds right, but it's made
to be able to spit current out the output (+ end) and not backwards.
Measure it and it looks OK (measure +5 out, turn it around, measure -5
out) but you won't be able to make it do any "work" in that
configuration.

	Check digi-key.com or mpja.com for DC-DC convertors.  Laptop power
supplies are also typically made to take in ~12V or so and make +/-12 and
+/-5 out.

	If current draw will be low, you can use a plain old linear
regulator (like LM7805 for +5V out.. +9 -9 -5 -12 +12 etc are all
available). Remember that they burn off power as heat; the greater the
difference between your input and output as well as the current you are
drawing through it affects how ineffecient they will be.

Don Papp
http://aeinnovations.com

GPG/PGP Key: http://aeinnovations.com/downloads/pubkey.html

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