ProcirelIn monostable (one-shot) mode, the 555 timer outputs a single HIGH pulse of a precisely defined duration when triggered. It then returns to LOW and waits for the next trigger. Used in button debouncing, pulse generation, missing pulse detection, and timed relay activation.
Pulse Width: T = 1.1 × R × C
Results
How to use this calculator
Step-by-Step Instructions
1. **Enter the timing resistor R** Connected between VCC and pins 6/7 of the 555. This, along with C, determines pulse duration.
2. **Enter the timing capacitor C** Connected between pin 6 and ground. Larger values give longer pulses.
3. **Click Calculate** The output pulse width is displayed in seconds, milliseconds, or microseconds as appropriate.
Worked Example 1 Second Pulse
R = 910kΩ, C = 1µF T = 1.1 × 910000 × 0.000001 = **1.001 seconds**