For an Astable multivibrator shown here, the frequency can be calculated as:

For an Astable multivibrator shown here, the frequency can be calculated as: Correct Answer <span class="math-tex">\(f=\dfrac{1.44}{(R_A+2R_B)C}\)</span>

555 timer

Important Points

Monostable operation

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• In a stable or stand-by state, the output of the circuit is approximately zero or a logic-low level.
• When an external trigger pulse is applied output is forced to go high (≈ V_CC).
• The time for which output remains high is determined by the external RC network connected to the timer. At the end of the timing interval, the output automatically reverts to its logic-low stable state.
• The output stays low until the trigger pulse is again applied. The monostable circuit has only one stable state.
• The pulse width can be calculated as T = 1.1 RC