HELP : Question about DC-motor driver

From: bamse (nospam_at_nospam.nospam)
Date: 01/25/04

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    Date: Sun, 25 Jan 2004 02:45:19 +0100

    http://www.miteget.net/donniebrasco9/gfx/brugerupload/motor.JPG

    The above link shows a circuit design for a
    motordriver.

    And here are the datasheets:
    http://www.miteget.net/donniebrasco9/gfx/brugerupload/RFP40N10.pdf
    http://www.miteget.net/donniebrasco9/gfx/brugerupload/ir2104.pdf

    What is the purpose of the resistance in front of
    each gate of the MOSFET-transistors? And what
    about the other components (capacitors, diode)? What are their
    purpose/function in this context?

    And can someone please tell me, what exactly goes on in this circuit?

    And what are the advantages of using MOSFET instead of another kind of
    transistor?

    Thanks 

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