At 01:59 PM 1/27/2003 +1300, you wrote:
>Or using centre tap for fullwave rectifier :-
>
>
>                  metal frame grounded        ____
>        Neutral     to Earth                 |    |
>           +----------+  ---->|-----+---+-----7805|----+----o
>                      |  |  Diode   | + |    |____|    | +
>                      C||C         ###  |      |      ###
>                      C||C         ---  |      |      ---
>                      C||C          |   |      |       |
>                      C|||          |   |      |       |
>                      C||+-----+----+----------+-------+--------+
>                      C|||     |        |
>                      C||C    ===       |
>                      C||C  Earth       |
>         Hot          C||C              |
>           +----------+  |----->|-------+
>                              Diode


Sure, or full wave bridge to get +/- . ;-)

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

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