555 Timer Astable mode, Lt spice simulation, and real-time testing

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555 Timer Astable mode, Lt spice simulation, and real-time testing 

We know 555 timer has three operating modes called Astable mode, Monostable mode, and Bistable mode.

Astable Mode :

In Astable mode, 555 IC will act as an oscillator that generates a square wave continuously. The frequency of the wave can be adjusted by changing the values of two resistors and a capacitor connected to the chip. 

LTspice circuit:




Formulas:








Calculations:

Ton = 0.693(1k+100k)22uF =1.539ms
Toff =0.693*100k*22uF =1.524ms
T = Ton + Toff  = 0.693(1K+2*100k)22ufF=3.064ms 
Frequency = 1/T = 1.44/(1k+2*100k)22uF = 1/3.06ms =0.3263Hz
Duty = 50.2%

Simulation Results:




Click here to download the Astable mode LTspice circuit

Testing:





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