1.

In astable operation of the 555 timer, the lower and upper peaks of the charging/discharging external capacitor are ________ to ________.

A. –VCC, VCC
B. –0.5 VCC, 0.5 VCC
C. 1/3 VCC, 1/2 VCC
D. 1/3 VCC, 2/3 VCC
Answer» E.


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