555 timer calculator (monostable and astable operation)

This 555 timer IC calculator can calculate frequency, duty cycle, and high and low output of timer IC operation on both monostable and Astable. This Calculator script was written by Robert Davis of Goldsmith College

555 timer IC

555 timer Pin number and designation:
pin 1- ground or common pin
pin 2- trigger pin
pin 3- output pin
pin 4- reset pin
pin 5- control pin
pin 6- threshold  pin
pin 7- discharge pin
pin 8- positive supply






555 MONOSTABLE OPERATION
Acts as one shot  pulse generator of output high duration of  T=RC ln(3)

555 timer monostable

R: R K M


C: uF nF pF

T Output High (Seconds) =

555 TIMER ASTABLE OPERATION

555 timer astable operation

This operation has an output of continuous pulses of specified frequency and and duty-cycle.

R1: R K M


R2: R K M


C: uF nF pF

T₁ Output High (Seconds) =


T₂ Output Low (Seconds) =


T Total Period (Seconds) =


Frequency (Hz) =


Duty (%High) =