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Posts posted by ante

  1. Quite often the things you connect to a PSU are equipped with big capacitors on their input. If you have a big capacitor on the PSU output it reduces the rushin current from the powerstage.
    The zener can easily be checked by connecting it in series with a resistor and measure the voltage across.

    Ante ::)

  2. Mastrilla,
    Sometimes a variac is not isolated from mains and in that case it is dangerous to use for a PSU.
    If you take a look here http://www.action-electronics.com/variac.htm#Vary you can see that only one out of five is insulated. When it is not insulated means that the secondary winding is part of the primary and if you connect live to the wrong side you can kill yourself! :o And we don

  3. Hi John

    Some research in old books:
    2SD2065 :NPN power/audio/switch ,140Volts 7A 80W
    Can be replaced with BD245D 2SC2706 2SC2837 2SC3907
    Question : Does the 2SD2065 have an insulated case?
    One of my books states that the comparison type does not have insulated case, so makes me wonder :-\

    Ante ::)

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