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Thread: LM317

  1. 22nd March 2003 02:02 PM #1
    bogdanfirst
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    Default LM317

    ok, here is a simple thing...i hope so
    i have a somputer power suply wich outputs 12V.
    and what i want to do is to make a variavle suply....1.2 to 12V possibly uing the LM317
    but it needs at least a 3V drop on it so......
    also i want to generate +/-12V from the 12V, with the max current of 1-1.5A will be great, and problably use a LM337 for the negative side for making variable -1.2-12V suply.
    anybody has any ideas?
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  2. 22nd March 2003 04:27 PM #2
    Chippie
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    Take the 12v supply, feed to a LM257x boost regulator with a twin wound transformer........rectify the 2 secondary voltages and there's your _ & + 12v via your LM317's.........
    Eccentric millionaire financed by 'er indoors
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  3. 22nd March 2003 06:59 PM #3
    bogdanfirst
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    thats a good idea...
    so i generate a highter voltage and then i regulate it with the LM317. ?
    ok?
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