⏱️ 555 Timer Astable Mode Calculator

Calculate timing for oscillating clock circuit (Ben Eater Computer Clock)

1 kΩ
100 kΩ
1 µF
Charging Time (t1): 0.140 s
Discharging Time (t2): 0.069 s
Total Period (T): 0.209 s
Frequency: 4.78 Hz
Duty Cycle: 66.9%
LED Status: Blinking
Output Waveform (Square Wave)
📐 Formulas Used:
t1 = 0.693 × (R1 + R2) × C
t2 = 0.693 × R2 × C
T = t1 + t2 = 0.693 × (R1 + 2×R2) × C
Frequency = 1 / T
Duty Cycle = (t1 / T) × 100%