Transistor Characteristic Apparatus Experiment, Physics instrument, general laboratory equipment manufacturers.

AC Chopper

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AC Chopper

AC Chopper

The low voltage ac voltage ( S1 of T ) is applied to the pair of two SCRs, CR1 and CR2,  connected antiparallel with in series RL. These are the main SCRs. As the SCR is being  commutated at the crossover points of ac cycle,  but then it becomes a simple phase control circuit. 

To commutate them earlier at required time two  auxiliary SCRs, CR3 and CR4 are used.



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