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digital electronics flip flops
1. In a 555 timer, three 5 k resistors provide a trigger level of ________.
(A): 1/3 VCC and a threshold level 2/3 VCC
(B): 1/3 VCC and a threshold level 3/4 VCC
(C): 1/4 VCC and a threshold level 1/2 VCC
(D): 1/4 VCC and a threshold level 2/3 VCC
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