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http://www.circuitstoday.com/choppers-an-introduction

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http://www.circuitstoday.com/wp-content/uploads/2012/01/Chopper-First-Quadrant.jpg

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http://www.circuitstoday.com/wp-content/uploads/2012/01/Chopper-Second-Quadrant.jpg

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http://www.circuitstoday.com/wp-content/uploads/2012/01/Chopper-Two-Quadrant.jpg

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http://www.circuitstoday.com/wp-content/uploads/2012/01/Two-Quadrant-Type-B-chopper-or-D-chopper-Circuit.jpg

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http://www.circuitstoday.com/wp-content/uploads/2012/01/Positive-First-Quadrant-Operation-and-Negative-Fourth-Quadrant-Operation.jpg

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http://www.circuitstoday.com/wp-content/uploads/2012/01/E-type-Chopper-Circuit-diagram-with-load-emf-E-and-E-Reversed.jpg

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