‰  NOW 25 WPM  ‰  TEXT IS FROM JANUARY 2017 QST  PAGE 32‰

GREATLY IN EXCESS OF THE VOLTAGE FROM THE TRANSFORMER, SIMPLY FROM ITS
TURNS RATIO.  THE PEAKS OF THESE CYCLES ARE RECTIFIED AND FILTERED, AND
THEIR AMPLITUDE ADDED TO THE BASIC SQUARE WAVE SHAPE.  THE OUTPUT VOLTAGE
TAKES ON A LIFE OF ITS OWN WITH LOAD VARIATION, GREATLY EXCEEDING WHAT IS
EXPECTED WHEN THE SUPPLY IS UNLOADED.  I TRIED A NUMBER OF DIFFERENT
WINDING LAYUPS, GUIDED BY A TEXT ON A SMALL TRANSFORMER DESIGN, BUT ALL
WERE TO NO AVAIL.  FINALLY, AFTER MUCH RESEARCH, TRIAL AND ERROR, AND SPICE
ANALYSIS, I DETERMINED THAT A TRANSFORMER WITH FOUR PARTICULAR IMPROVEMENTS
WOULD PRODUCE SATISFACTORY OUTPUT REGULATION WITHOUT A FEEDBACK LOOP, THAT
IS, BY USING OPEN LOOP OPERATION.  FIRST, I RELIED ON THE TRANSFORMER
EQUATION, BUT THEN DOUBLED THE STACK OF CORE MATERIAL.  THIS RESULTS IN AN
OVER DESIGNED TRANSFORMER WITH A SOMEWHAT IMPROVED COEFFICIENT OF COUPLING
K FACTOR.  THE K FACTOR IS IMPROVED BECAUSE EACH TURN OF ANY WINDING HAS A
‰  END OF 25 WPM TEXT  ‰  QST DE W1AW  ƒ