general

IC 555 Astable Timer

Computes the timing parameters of a 555 timer configured in astable (free-running) mode. Calculates high period, low period, total period, frequency, and duty cycle from R1, R2, and capacitance values with unit selection.

Inputs

Resistance R1

R1 resistance value

R1 Unit Multiplier

Unit multiplier for R1 — K: 1000, R: 1, M: 1000000

Resistance R2

R2 resistance value

R2 Unit Multiplier

Unit multiplier for R2 — K: 1000, R: 1, M: 1000000

Capacitance

Capacitance value

Capacitance Unit Multiplier

Unit divisor for capacitance — µF: 1000000, nF: 1000000000, pF: 1000000000000

Results

High Period0.000e+0sDuration of the high output state in seconds

Low Period0.000e+0sDuration of the low output state in seconds

Total Period0.000e+0sTotal oscillation period in seconds

Frequency0.000e+0HzOscillation frequency in hertz

Duty Cycle0.000e+0%Duty cycle as a percentage of the high period