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A Student's Dilemma

Discussion in 'General Electronics Discussion' started by Paul Black, Dec 4, 2012.

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  1. Paul Black

    Paul Black

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    Dec 4, 2012
    Hey Y'all. I need to rectify and regulate 120vac into 90vdc. Any ideas?
     
  2. davenn

    davenn Moderator

    13,722
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    Sep 5, 2009
    Hi there Paul
    welcome to the forums :)

    well a 120V to ~ 80V transformer for a start
    a bridge rectifier current rating unknown .... you havent told us what is needed
    at least 1 electrolytic cap at ~ 1000uF / Amp that you need
    for regulation, very basic would be a zener diode and resistor if looking at ~ 1 Amp max, otherwise you will need a transistor regulator circuit.
    I dont know of any regulator chips that go that hi in voltage

    Dave
     
  3. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    2,809
    Jan 21, 2010
    rectify, filter, regulate.

    Without more information I can't help you. I *hope* you're not taling about mains here. If so, the answer becomes: transformer, rectify, filter (and optionally regulate). The regulation is optional depending on your needs and the transformer you choose (and the load, etc)
     
  4. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    There is this chip:
    Supertex LR8
    It is rated for 20mA only, but nevertheless in some applications may be useful.

    Harald
     
  5. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    @Dave: I took the liberty to merge your thread into this one.

    Harald
     
  6. KMoffett

    KMoffett

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    Jan 21, 2009
    Driving a motor? How much current...or what horsepower?

    Ken
     
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