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555 Timer LED Flasher - Calculating the Pulse Rate

Pulse Rate

In astable mode, the output from the 555 timer is a continuous pulse waveform of a specific frequency that depends on the values of the two resistors (RA and RB) and capacitor (C) used in the circuit.

circuit-pulse

Circuit Pulse

The charge time (Output High)

t1=0.693(R1+R2)C1

And Output Low

t2=0.693(R2)C1

Total time period , T=t1+t2.
Frequency , F=1/T.

Duty Cycle Calculation

Example

Duty Cycle Calculation

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