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HV artificial CT

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  • HV artificial CT

    Saw someone say they had found a setup like this in a (working) amplifier for the high voltage supply. I've never heard of it or seen it before (or am I just not recognizing it?).
    I'm guessing there must be reasons it's not common, what kind of problems does it present?

    Click image for larger version

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    Originally posted by Enzo
    I have a sign in my shop that says, "Never think up reasons not to check something."



  • #2
    It's basically just a Full Wave Bridge. Two legs have extra diodes. The "short" legs need to be able to withstand full peak Voltage. Output is the full V peak of the winding.
    WARNING! Musical Instrument amplifiers contain lethal voltages and can retain them even when unplugged. Refer service to qualified personnel.
    REMEMBER: Everybody knows that smokin' ain't allowed in school !

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    • #3
      Yes, assuming it’s feeding a reservoir cap, the (unloaded) VDC will be 1.4x the winding VAC. Whereas with a CT to 0V & 2 phase rectifier arrangement, the VDC will be 0.7x the winding VAC.
      My band:- http://www.youtube.com/user/RedwingBand

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      • #4
        Thanks, a real 'duh' moment, sometimes it's right in your face but you can't see it.
        Just a standard bridge arrangement with extra diodes as noted. It was a conversion from full wave CT, so it looked funny on paper with the extra diodes.
        Originally posted by Enzo
        I have a sign in my shop that says, "Never think up reasons not to check something."


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