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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