Design IC 555 astable multivibrator circuits with ease! Our online calculator determines frequency, period, ON/OFF times, and duty cycle based on your R1, R2, and C values. Optimize your timing applications quickly and accurately.
Formula:
The IC 555 timer in astable mode generates continuous pulses. The key parameters are calculated as follows:
- Frequency (f): f = 1 / (0.693 * (R1 + 2R2) * C)
- Period (T): T = 1 / f
- ON Time (TON): TON = 0.693 * (R1 + R2) * C
- OFF Time (TOFF): TOFF = 0.693 * R2 * C
- Duty Cycle (D): D = (R1 + R2) / (R1 + 2R2) * 100%
Where:
- R1: Resistance between Vcc and Pin 7 (in Ohms)
- R2: Resistance between Pin 7 and Pin 6 (in Ohms)
- C: Capacitance between Pin 2/6 and Ground (in Farads)