ATX supply question

Discussion in 'Radio Circuits, Repair & Performance' started by K8ERV, Jun 21, 2012.

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  1. KC8ADU

    KC8ADU Ham Member QRZ Page

    the main filter caps on the primary side must discharge to reset the ocp.
    if the bleeders are open this may take a while.
    one could decrease the resistance of the bleeders to shorten the required off time at the expense of slight efficiancy loss.
  2. G4COE

    G4COE Ham Member QRZ Page

    Wouldn't the 're-set off time' depend on the time constant of a capacitor holding the OCP ON, this 'could' be part of the opto coupler feedback

    It's that flux cap...... it's dried out!

  3. K8ERV

    K8ERV QRZ Member QRZ Page

    To all who suggested that, you nailed it. There was no bleeder. I put in 10K and now I get a reset in a minute (or maybe less).

    I'mma happy camper.

    I learned something.

    Hard to do.

    Harder to admit.

    TOM K8ERV Montrose Colo
  4. KA9JLM

    KA9JLM Ham Member QRZ Page

    Cool that you got it working.

    I don't think they bother to put a bleeder, because normally one is not needed.

    Nice Job.
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