Flip Flops – 93

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93. The timing network that sets the output frequency of a 555 astable circuit contains ________.

(a) three external resistors are used
(b) two external resistors and an external capacitor are used
(c) an external resistor and two external capacitors are used
(d) no external resistor or capacitor is required

Explanation
Explanation : No answer description available for this question. Let us discuss.
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