power supply

Discussion in 'General Electronics Chat' started by geet12, Dec 16, 2011.

  1. geet12

    Thread Starter New Member

    Dec 16, 2011
    1
    0
    Hi,
    I have to design a power supply 12VDC to 9VDC.But this has to get turned on with 3.3VDC coming from different board.
    Please suggest how can I turn on a power supply with 3.3VDC( what all components would be needed).
    Thanks,
    G
     
  2. tracecom

    AAC Fanatic!

    Apr 16, 2010
    3,869
    1,393
    Use a standard LM7809 regulator circuit with the 12 V input switched on by a MOSFET gated with 3.3 V.
     
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