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CBETO3AP

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    OZ6YM
    CBETO3AP got a reaction from OZ6YM in 0-30 VDC Stabilized Power Supply 0.002-3 A   
    Hi
    I work on Hristo PCB, member of this community.
    http://diyfan.blogspot.com.es/2012/02/adjustable-lab-power-supply.html

    By changing the shunt, as I feared, the current regulation is very slow, now I'm looking solution without increasing the shunt.
    No load through the PCB and is cut so.

  2. Like
    CBETO3AP
    CBETO3AP reacted to audioguru in 0-30 VDC Stabilized Power Supply 0.002-3 A   
    Your main filter capacitor value is much too low for an output of 10A. use at least 20,000uF.
    The transformer voltage is too high for a maximum output voltage of only 20V and its current rating is much too low.
    The poor little BD139 driver transistor will smoke and die if you are unlucky to find those very old output transistors with low current gain.
    Q1 is completely wrong. Its maximum allowed reverse bias on its base-emitter is only 5V.   
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