5555555555 35. 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
5555555555 5. In a 555 timer, a series connection of three resistors sets the reference voltage levels to the two comparators at ________ and ________. (a) 2VCC / 3, VCC / 3 (b) VCC / 2, VCC / 4 (c) VCC, VCC / 2 (d) VCC, VCC