Q. How to obtain symmetrical waveform in Astable multivibrator?

A
Use clocked RS flip-flop
B
Use clocked JK flip-flop
C
Use clocked D-flip-flop
D
Use clocked T-flip-flop
Solution:

Symmetrical square wave can be obtained by adding a clocked JK flip-flop to the output of Astable multivibrator. The clocked flip-flop acts as a binary divider to the times output and produces 50% duty cycle without any restriction on the choice of resistors.

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