At 07:43 PM 1/16/01 -0800, Jane Ifurung wrote:
>We are doing a project where we are using single 12V
>power supply. We wanted to run +/-5V, +/-12V, and +3V
>on our single board to be derived from the single +12V
>power supply. Is there a single voltage regulator that
>can do this? Can you please give me some sites where I
>can get valuable information on designing power
>supplies and the EMI or EMC consideration?

A flyback switcher can do this for you.
You only get one regulated output, without external post-regulation.
EMI/EMC isn't a problem if designed/built right.

How much power do you need on each output?

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