Question

How to achieve 50\% duty cycle in adjustable rectangular wave generator? (Assume \( R_1 \) is Resistor connected between supply and discharge and \( R_2 \) is Resistor connected between discharge and trigger input.)

• A. \( R_1<R_2 \)
• B. \( R_1>R_2 \)
• C. \( R_1 = R_2 \)
• D. \( R_1 \geq R_2 \)

Hint:

In a 555 timer configuration, setting \( R_1 = R_2 \) ensures that the output waveform has a 50% duty cycle.

Answer 1

The Correct Option is C

For achieving a 50\% duty cycle in a typical 555 timer-based adjustable rectangular wave generator, the resistors \( R_1 \) and \( R_2 \) must be equal. This ensures that the charge and discharge times of the capacitor are balanced, leading to a 50% duty cycle. Therefore, the correct answer is option (3).