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Ordinary thyristor measured by battery

2016-05-11 18:04  
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Ordinary thyristor measured by battery
It takes four 1.5V batteries connected in series, then switch S is connected, E1 cathode is connected to anode of ordinary thyristor VS by lamp HL. E2 negative pole is connected to VT cathode. Close the S, HL is not extinguished. Because the lamp resistance is small, the current flowing through VT is sufficient to maintain triggered conduction current. Only disconnecting the anode or cathode connection of the thyristor, VT will shutdown, HL is extinguished.