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Stupid question about power supply voltage... — Parallax Forums

Stupid question about power supply voltage...

base2designbase2design Posts: 78
edited 2011-04-07 04:53 in Propeller 1
Hello out there. I'm highly embarrassed that I'm asking such a fundamental question.

I have an audio part that requires a -12VDC supply... is it possible to produce that from a 12V wall-wart?

BR,

-b2d

Comments

  • LeonLeon Posts: 7,620
    edited 2011-04-06 10:27
    Yes, reverse the connections if necessary.
  • doggiedocdoggiedoc Posts: 2,245
    edited 2011-04-06 10:43
    You can use a voltage divider to create common reference above 0V. I assume you need P-P voltage of 24V for your a/c signal? You could also connect 2 identical 12V wall-warts in series and use the common connection as a ground reference. That would give you -12V to + 12V you need.
  • doggiedocdoggiedoc Posts: 2,245
    edited 2011-04-06 10:57
    Here are sketches of what I mean if it will help.

    voltage_divider.png

    wall-wart_diagram.png





    EDIT: Fixed images' domain alias since they quit resolving for some reason.
  • doggiedocdoggiedoc Posts: 2,245
    edited 2011-04-07 04:53
    base2design wrote: »
    ... is it possible to produce that from a 12V wall-wart?
    Any successes with our suggestions?
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