Calculate NE555 timer frequency, period, and duty cycle in astable mode, pulse width in monostable mode, or design R1/R2 from a target frequency and duty cycle with standard E-series values.
Frequency
6.87 Hz
Duty Cycle
52.38 %
Period (T) 145.6 ms
High time (tโ) 76.25 ms
Low time (tโ) 69.31 ms
Live Simulation
10.3ร slower than realโ
Vcc โ
Vcc
Vc
0.00 V
Output
HIGH
State
Charging ยท #0
tโ = 0.693 ร (R1 + R2) ร C ยท tโ = 0.693 ร R2 ร C ยท f = 1 / (tโ + tโ)