555 Timer, Astable (Freq/Duty Cycle In, Rt/Rb/C Out)

This calculator calculates the resistances and capacitances needed to operate a 555 timer in astable mode. The duty cycle cannot be set lower than 50%, if you want to do this you will have to attach an inverter to the output.

Frequency
Duty Cycle
Capacitance
Period
Time High
Time Low
R1
R2