1.

In a 555 timer, three 5 k resistors provide a trigger level of ________.

A. 1/4 VCC and a threshold level 1/2 VCC
B. 1/3 VCC and a threshold level 3/4 VCC
C. 1/3 VCC and a threshold level 2/3 VCC
D. 1/4 VCC and a threshold level 2/3 VCC
Answer» D. 1/4 VCC and a threshold level 2/3 VCC


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