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giova

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Posts posted by giova

  2. 0-30 Vdc Stabilized Power Supply

    in Projects Q/A

    Posted

    Hi Audioguru,
    I really appreciate the help you try to give me.
    Well I checked the pots and they give 5.4k when they are at the middle.
    My transformer is 24v 5A.So I think that i can have 3A and more regulation.
    When i regulate voltages works perfect from 0 to 30V.
    However when i regulate the current It doesn't go more than 0.08A no matters where i put the pot of the volatges.One more thing is that when i put the current pot to one end then the voltages drop to
    -0.06, the led lights then, and the current is zero.When i turn a little the current just to show me 0.01A or 0.02A then the led turn off and the voltages work normal.
    One more thing that i tried is that i changed the current 10k linear pot with a 100k pot not linear and i managed to regulate the current from 0 to almost 1A.But this is also no right.The led turns on ONLY when i regulate the current to zero and the voltages drop
    to -0.06 only then.
    I don't have much experience at electronics and i really can't figure out why this happens.I have checked my project with the original schematic thousand of times and i can't find any mistake.I also bought some new tlo81 and changed them but the same problem persist!

  3. 0-30 Vdc Stabilized Power Supply

    in Projects Q/A

    Posted

    Hello audioguru and thank you for your quick answer!
    First yes I use the original project's schematic.
    I also checked the things you said and they seem to be ok.
    The problem is tha i can;t go more than 0,08 amperes and when i regulate amperes to minimum the voltages drop to zero is this correct?
    I would also like to ask if theproblem may be to pot.The pots I have they write: 1

  4. 0-30 Vdc Stabilized Power Supply

    in Projects Q/A

    Posted

    Hi to all!
    I built this project but something goes wrong.
    I can regulate the voltage from 0 - 30 BUT I can't
    regulate the current.Also when I turn the current's pot all the way
    then the volts drop to -00.6 !!
    Can someone help me?
    I use a 24v - 5A Transformer.
    I also use the TL081 IC.
    And finally i use the tip131 transisors for q1 q2.

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