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9 of 12 articles

555 Timer Monostable Mode

One shot pulse generator, pulse width = 1.1RC.

Darshan N
Updated: 19 March 2026
6 min read

555 Monostable Mode Quiz

Test your ability to apply the monostable pulse width formula and understand 555 one-shot triggering behavior.

Question 1 of 3

Q1.In a 555 monostable circuit, a negative edge trigger is applied to pin 2. The output pulse width T is given by 1.1*R*C. This formula arises because the capacitor charges from 0V toward VCC and the threshold comparator trips when the capacitor voltage reaches:

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Colpitts Oscillator

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Hartley Oscillator

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Clapp Oscillator

Modified Colpitts, improved frequency stability.

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Wien Bridge Oscillator

Bridge balance, AGC, frequency = 1/(2piRC).

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RC Phase Shift Oscillator

Three RC sections, 180 degree phase shift, frequency formula.

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