railway RRB JE (CBT I + CBT II) Mock Test 2024 Digital Electronics Multivibrators

The expression for time period of a 555 Timer based astable multivibrator is:

1
t1= 0.7 (R1 + R2) C1 and t2 = 0.7 R2 C1
2
t1 = (R1 + R2) C1 and t2 = 0.7 R1 C1
3
t1 = R1 C1 and t2 0.7 R2 C1
4
t1 = 0.7 (R1 + R2) C1­ and t2 = R2 C1
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