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John Greenland
CVRS Member


2 points/ questions.

1: You said you have a variac. What input voltage is required from the variac to get the voltages on the schematic ? If it is way off what might be expected from the electrical supply then your transformer probably has a short in the primary, resulting in effect, less windings on the primary and there by increasing the turns ratio, thus increasing the secondary voltages.

2:: If the transformer is rated for 110 volt and works at 30 cycles or less, then I have always been led to believe secondary voltages will go up as frequency goes up.


John G.