[Jewelry making - Article 00002] - [Orchid] Building servo driver

[Ian]

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Hi,

    Have any of you built the servo driver illustrated at the ELM web
    site? Here is a link to the schematic http://tinyurl.com/ytasof. I
    am intending to build this circuit for a miniature (watchmaker's
    size) cnc lathe but I am not certain that the schematic is correct
    and would value the opinion of someone more versed than I in matters
    electronic. The thing which is worrying me is the connection from
    the motor power supply to the logic power supply. The circuit shows
    the motor supply of +6 - 15v (I would actually like to use 24v and am
    using higher voltage FETs) connected directly to the output of the
    7805 regulator and the motor 0v connected to ground. I don't see how
    that could work and wonder whether maybe the 0v line should be
    floating? Any advice would be appreciated. 

Best wishes,
Ian
Ian W. Wright
SHEFFIELD UK
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