555 timer calculator monostable and astable operation

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) =