A stable multivibrator operating at 100 Hz has a discharge time 2 ms. Find the duty cycle of the circuit 

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ALP CBT 2 Electronic Mechanic Previous Paper: Held on 21 Jan 2019 Shift 2
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  1. 10%
  2. 20%
  3. 80%
  4. 50%

Answer (Detailed Solution Below)

Option 3 : 80%
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555 timer A stable Multivibrator pin diagram is shown below:

F3 U.B Madhu 07.03.20 D8

 

F3 U.B Madhu 07.03.20 D7

\(Duty ~Cycle = \frac{T_{on}}{T_{on}+T_{off}}\)

Total time = 1/frequency = 10 ms

Toff = 2 ms

Ton + Toff = Total time

Ton = (10 - 2) = 8 ms

\(Duty ~Cycle = \frac{8}{10} = 80\)%

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