Duty Cycle of Astable Multivibrator using IC 555 Explanation | Problem of Duty Cycle Solved
Channel: Prof. Madhukar Walunj
Date: 01/07/2021

@ProfMadhukarWalunj 
Basic Astable 555 Oscillator Circuit

As the timing capacitor, C charges through resistors R1 and R2 but only discharges through resistor R2 the output duty cycle can be varied between 50 and 100% by changing the value of resistor R2. By decreasing the value of R2 the duty cycle increases towards 100% and by increasing R2 the duty cycle reduces towards 50%. If resistor, R2 is very large relative to resistor R1 the output frequency of the 555 astable circuit will determined by R2 x C only.
The problem with this basic astable 555 oscillator configuration is that the duty cycle, the “mark to-space” ratio will never go below 50% as the presence of resistor R2 prevents this.


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