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In Reply to: RE: Question - any help appreciated posted by hukkfinn on August 26, 2007 at 08:39:04
9VAC actually varies between -12.7V and +12.7V.
Devices could depend on this by using a pair of half-wave rectifiers to produce a bipolar supply at something beyond +/- 9VDC; perhaps +/- 11V (depending on capacitor size and load) which gives enough headroom to use 3-terminal regulators for a solid supply.
9VDC could be AC with a half or full-wave rectifire producing a wave form with no negative component to produce the negative power supply; or a filtered 9VDC with no headroom for regulators.
You want to use a real 9VAC supply.
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