general

NE555 Timer Astable Circuit

Computes the oscillation parameters of a NE555 timer in astable (free-running) mode from raw resistor and capacitor values in ohms and farads. Formula: f = 1.44 / ((R1 + 2×R2) × C).

Inputs

Resistor 1(Ω)

R1 resistor value in ohms

Resistor 2(Ω)

R2 resistor value in ohms

Capacitor(F)

Capacitor value in farads

Results

Frequency0.000e+0HzOscillation frequency in hertz (source labels this MHz — that is a source bug, formula produces Hz)

Time High0.000e+0sDuration of the high output state in seconds

Time Low0.000e+0sDuration of the low output state in seconds

Duty Cycle0.000e+0%Duty cycle as a percentage