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2. The equation for the output frequency of a 555 timer operating in the astable mode is: . What value of C1 will be required if R1 = 1 k, R2 = 1 k, and f = 1 kHz?
(a) 0.33 F
(b) 0.48 F
(c) 480 F
(d) 33 nF
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