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RC step down

Discussion in 'Electronic Design' started by cell, Nov 7, 2008.

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  1. cell

    cell Guest

    Hi, everyone,

    I have seen several circuits from a book to step down 220V AC to 12V
    DC using only resistor, capacitors, diodes, and a 12V Zener diode.

    220V---Parallel RC---R---Bridge---Zener and smoothing caps---Gnd

    Load is connected to the 12V from the Zener and Gnd is from the bridge
    negative pin

    I am curious about why the portion "Parallel RC---R" can be used.

    For RC parallel components,
    R=750k
    C=0.1u (400V)

    For another resistor,
    R=22
     
  2. Guest

    Since this provides no isolation, there are no survivors of this
    design to give you the schematic.
     
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