Calculadora de Timer 555 Astável — Formula
## 555 Timer Astable Mode
### Formulas
**f = 1.44 / ((R1 + 2R2) x C)**
**Duty Cycle = (R1 + R2) / (R1 + 2R2) x 100%**
Duty cycle is always above 50% in standard configuration. Use a diode across R2 for below 50%.
### Formulas
**f = 1.44 / ((R1 + 2R2) x C)**
**Duty Cycle = (R1 + R2) / (R1 + 2R2) x 100%**
Duty cycle is always above 50% in standard configuration. Use a diode across R2 for below 50%.
Exemplo Resolvido
R1 = 10k, R2 = 10k, C = 0.1 uF.
- f = 1.44 / ((10000 + 20000) x 0.0000001) = 1.44 / 0.003 = 480 Hz
- Duty cycle = (10 + 10) / (10 + 20) x 100 = 66.7%