voltage regulator +/-

Discussion in 'General Science & Technology' started by cato, Jan 4, 2006.

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  1. cato less hate, more science Registered Senior Member

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  3. cato less hate, more science Registered Senior Member

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  5. leopold Valued Senior Member

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    17,455
    yes that is the right kind of pot

    edit
    remember that one side of the pot is wired opposite the other
    that is when the pot is turned fully clockwise one side will produce max plus volts the other max minus volts

    the way you have it now both sides produce the same voltage

    since the h bridge was submitted by metakron you need his input on the following
    the groud needs to return to the minus side of your supply
    or it needs to return to the transformer centertap in that case your transformer needs to output 30 vac
    l
     
    Last edited: Jan 16, 2006
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  7. leopold Valued Senior Member

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    17,455
    question
    does this have anything to do with the questions you are asking in the computer forum
    just curious
     
  8. MetaKron Registered Senior Member

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    5,502
    Sorry, no, that is not the right kind of pot. A stereo volume control will be audio taper, not linear taper. You have to have linear taper. The schematic looks correct.

    This page has several dual linear taper potentiometers. They have no minimum order and a $7 shipping and handling charge. They are a pretty good source for the rest of the components, too. You may have to dig for the mounting hardware for the potentiometer, though. It may come without it.
     
  9. leopold Valued Senior Member

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    17,455
    metakron
    are the pots connected correctly in this diagram?

    and where does the ground connect to? the minus side of the supply or the center tap?

    sorry about the pot i should have known audio when i seen stereo. duh

    the pot connections and the ground connection doesnt seem right

    you said one op amp is fed the inverse of the other
    the way the pots are connected they both get the same polarity and voltage

    also the ground doesn't connect anywhere
     
    Last edited: Jan 17, 2006
  10. cato less hate, more science Registered Senior Member

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    2,959
    nope, no connection.

    I am not sure about the wiring of the POT, that was the part I was unclear with before. I will look at it. (help from would be nice there =])

    I was going to connect the grounds back to the neg side of the bridge rectifier, but I could do either. I just left it as a ground symbol because I didn't want so many wires crossing there.

    do you guys know any where I might get a pot without ordering it online, I don't want to spend $7 for a cheap part like that. do they combine shipping on orders of many parts? because it would be worth the shipping if I buy all the parts there.
     
  11. leopold Valued Senior Member

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    17,455
    check radio shack and ask for a linear taper dual ganged pot
     
  12. leopold Valued Senior Member

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    17,455
    cato
    this is the size of pot to get, 10k or 1M
     
  13. MetaKron Registered Senior Member

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    5,502
    The ground is just the negative side of the power supply.

    the pots are connected correctly. The "x" thing is where those wires cross without connecting.
     
  14. leopold Valued Senior Member

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    17,455
    on your schematic
    the left side pot
    take the connection to + and change it to -
    on the other end of the same side change it from - to +

    if you look at my first tinycad schematic you will know what to do
     
  15. leopold Valued Senior Member

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    17,455
    i disagree
    the op amps are getting the same and equal voltage as connected.
     
  16. MetaKron Registered Senior Member

    Messages:
    5,502
    Anything 10k to 1 Meg I can guarantee will work.

    Leopold, I think we're just going to have to make a note that one potentiometer is wired backwards to the other.

    Cato, you can combine parts for the order. They say 7 dollars shipping and handling but they don't say that there is a weight or size limit for regular shipping which may take about a week to get to places in the U.S. and Canada. I think when you order enough they pick up the extra shipping. It's all in their "shipping info" on the site.
     
  17. leopold Valued Senior Member

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    17,455
  18. cato less hate, more science Registered Senior Member

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  19. leopold Valued Senior Member

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    17,455
    erase the diagonal line between the two pots
    on the right pot connect the bottom to +
    connect the top of the left pot to +

    remember that your rectifiers will drop approx 1.5 volts
    the voltage drop of the inducter will be detirmined by it's dc resisence
    also the voltage drop of a saturated transister will not be zero
    the voltage at the output of the inductor will be
    approx. 0.7xpeak rectifier output

    all four of those must be considered when buying your transformer

    you also said that you wanted to fuse the circuit
    i would fuse the primary
    the primary power will approx.= the secondary power
    make sure the fuse is slo-blo or it will blow every time you turn on the supply

    here is a site for ohms law formulas
    http://www.angelfire.com/pa/baconbacon/page2.html

    here is a site for various circuit designs
    http://users.pandora.be/educypedia/electronics/analogmis.htm

    power supply design sites
    http://my.integritynet.com.au/purdic/power1.html
    http://www.national.com/appinfo/power/
     
    Last edited: Jan 18, 2006
  20. cato less hate, more science Registered Senior Member

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  21. leopold Valued Senior Member

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    17,455
    yes that should hook you up

    goodluck and godspeed
     
  22. MetaKron Registered Senior Member

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    5,502
    Just to be very, very technical, the negative side of the power supply needs to be explicitly attached to the ground bus. It looks like it's ready.
     
    Last edited: Jan 22, 2006
  23. cato less hate, more science Registered Senior Member

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    2,959
    yeah, I was going to do that, but I distracted by other mods =]

    anyway, do you know how to simulate something like this in a SPICE program? I have PSpice and another SPICE program (multisim, I think). is it possible to simulate a potentiometer? like user controlled? or would I have to simply replace the pot with different resistances to get an idea of what is going on?
     
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