JB> What's this one called?              Voltage doubler
JB>      _______________________ +      - _______________________
JB>     |               |                |               |
JB>     |               |                |               |
JB>   |/'               |               _|_              |
JB> --|~              -----             \~/            -----
JB>   |\              ~~T~~             ~T~            ~~T~~
JB>     |     output    |                |               |
JB>     |-----o    o----|                |-----o AC o----|
JB>     |               |                |               |
JB>   |/'               |               _|_              |
JB> --|               -----             \~/            -----
JB>   |\,             ~~T~~             ~T~            ~~T~~
JB>    ~|               |                |               |
JB>     |               |                |               |
JB>      ~~~~~~~~~~~~~~~~~~~~~~~~ -     + ~~~~~~~~~~~~~~~~~~~~~~~~

MR> I don't recall but at first I thought some guitar amplifiers use
MR> this type of circuit in their output stage. In that circuit the
MR> capacitors do double duty both to couple the loudspeaker and to
MR> filter the supply. But I was wrong since in that amplifier circuit
MR> the capacitors go between the colletors, the emitters are common
MR> to ground, and ground is floating with respect to the power supply.
MR> It's a very odd circuit!

 When the power supply is bi-polar (the common
of the two capacitors is the common of the amp)
then this circuit acts just as you've described
and the capacitors are the Power Supply filters.

 The circuit can be designed with either the
collectors, the emitters, or one of each as the
output terminals.

 TTYL.

 Robert

 * SLMR 2.1a * I need some duck tape.My duck has a quack in it.
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