Converting 24Vdc or 18Vdc into +/-18Vdc? Possible?

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Thank you for your suggestions.

jackinnj: I will look into this. Could you provide a link to a design?

zlast: your suggestion was looking spot on until "This circuit will not work with external DC power supplies - it must use AC."

I don't particulary want external supplies (I want to keep one on/off switch).
 
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