Virtual Labs

Tools

Aim

Theory

Pretest

Procedure

Simulation

Posttest

References

Contributors

Feedback

Aim

Theory

Pretest

Procedure

Simulation

Posttest

References

Contributors

Feedback

Astable Multivibrator using IC 555

Choose difficulty:

Beginner

Intermediate

Advanced

1. What is the formula to calculate the time period of the astable multivibrator?

a: T = 0.69 * (R_A + R_B) * C Explanation

Explanation

b: T = 0.69 * (R_A + 2R_B) * C Explanation

Explanation

c: T = 0.69 * R_B * C Explanation

Explanation

d: T = 1.1 * R * C Explanation

Explanation

2. How to calculate duty cycle of an astable multivibrator output? ?

a: Duty cycle = (T_ON/(T_ON+T_OFF)) *100 Explanation

Explanation

b: Duty cycle =(T_ON/(1+T_OFF)) *100 Explanation

Explanation

c: Duty cycle = T_ON/T * 100 Explanation

Explanation

d: Duty cycle = (T_OFF/(T_ON+T_OFF)) *100 Explanation

Explanation

3. Calculate the ON time, OFF time, Total time period, Duty cycle and Frequency of the output generated by an astable multivibrator using resistors RA = 5k, RB =5K and capacitor C = 10µf.

a: T = = 0.103 s, Duty cycle = 66.99%, Frequency = 2.5Hz Explanation

Explanation

b: T = = 2.103 s, Duty cycle = 50.99%, Frequency = 5.7Hz Explanation

Explanation

c: T = = 0.103 s, Duty cycle = 50%, Frequency = 9.7Hz Explanation

Explanation

d: T = = 0.103 s, Duty cycle = 66.99%, Frequency = 9.7Hz Explanation

Explanation

4. Determine the frequency and duty cycle for the 555 astable multivibrator output for C=0.01 uF, R_A= 2 kohm and R_B= 100 kohm.

a: Frequency = 714.3 Hz, Duty cycle = 50.5 % Explanation

Explanation

b: Frequency = 214.3 Hz, Duty cycle = 25.5 % Explanation

Explanation

c: Frequency = 208.9 Hz, Duty cycle = 75.5 % Explanation

Explanation

d: Frequency = 700.5 Hz, Duty cycle = 50.5 % Explanation

Explanation

5. Design a 555 timer as an astable multivibrator with an output signal frequency of 700 Hz and 50 % duty cycle.

a: R_A= 2 kohm,R_B= 100 kohm, C=0.01uF Explanation

Explanation

b: R_A= 100 kohm,R_B= 100 kohm, C=0.01uF Explanation

Explanation

c: R_A= 100 kohm ,R_B= 2 kohm, C=0.01uF Explanation

Explanation

d: R_A= 2 kohm ,R_B= 2 kohm, C=0.01uF Explanation

Explanation

Community Links Sakshat Portal Outreach Portal FAQ: Virtual Labs

AGPL 3.0 & Creative Commons (CC BY-NC-SA 4.0)