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Artesyn 3T12AP DC to DC regulator

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    #21
    I found some small broken traces near the LM723, and after repair, i get 7V on output with input of 48V, should i calibrate the voltage with the long blue potentiometer with a screwdriver?
    And i also accidentally broke the small orange cap at the LM723, is this a crucial component?

    edit:
    i tried to tighten/loosen the potentiometer but voltage did not change change

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    Last edited by rtstorm; 06-05-2025, 05:23 AM.
    ...the quieter you become the more you are able to hear...

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      #22
      If i tighten the resistor screw all the way i got 13-14V on output, but thats the max
      ...the quieter you become the more you are able to hear...

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        #23
        You should not need to adjust anything significantly, so there is still something wrong, like a problem with the feedback circuitry. Maybe something else is open-circuit.

        If you have found broken traces already there may be more. Also more components maybe damaged.
        I've found resistors that looked okay but the terminal had rotted off underneath the paint. Ohm them all out.

        Yes replace the capacitor you broke. It wouldn't be there for no reason.

        Out of interest, what is the other IC that isn't the LM723?
        "Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
        -David VanHorn

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          #24
          Originally posted by rtstorm View Post
          I also found this resistor to look burned, it reads 0.6kOhm but from the color chart it shoud be like 60ohm not in kOhm, am i correct
          The colour code looks to me like Blue-Red-Black which would be 62 ohms, which is a standard value, but a black tolerance band is not normal.
          Unless it's meant to be Blue-Red-Black-Black (620 Ohms) with no tolerance band (20%) which I believe is non-standard.
          (A 20% resistor like that should be Blue-Red-Brown with no tolerance band)

          When resistors burn the colour bands often change (get darker) although this resistor looks like it's just really dirty, rather than burned.
          However, it may really be a 62 Ohm resistor that burnt up and is now 10x higher than it should be.
          What is it connected to in circuit?

          You can always try the trick of scraping away the outer coating and measuring the resistor body directly. If there is a burned patch, measure between that and each lead and add the readings together to get an approximate value.
          Last edited by Agent24; 06-12-2025, 05:09 PM.
          "Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
          -David VanHorn

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            #25
            the 723 is a simple chip, the datasheet shows example circuits
            https://www.ti.com/product/LM723

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