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The proposed circuit generates accurately spaced PWM pulses which imitates a sine wave very closely and thus can be considered as good as its sine wave counter part design. Here we use  two stages for creating the required  PWM pulses, the stage comprising the ICs 741 and the other comprising the IC 555. Let’s learn the whole concept in details. How the Circuit Functions – The PWM Stage The circuit diagram can be understood with the following points: The two op amps are basically arranged to generate the required sample source voltages for the IC 555.  The couple of outputs from this stage is responsible for the generation of square waves and triangular waves. The second stage which is actually the heart of the circuit consists of the IC 555. Here the IC is wired in a monostable mode with the square waves from the op amp stage applied to its trigger pin #2 and the triangular waves applied to its control voltage pin # 5. The square wave input triggers the monostable to ge...

The proposed circuit generates accurately spaced PWM pulses which imitates a sine wave very closely and thus can be considered as good as its sine wave counter part design. Here we use two stages for creating the required PWM pulses, the stage comprising the ICs 741 and the other comprising the IC 555. Let’s learn the whole concept in details. How the Circuit Functions – The PWM Stage The circuit diagram of the proposed pure sine wave inverter can be understood with the following points: The two op amps are basically arranged to generate the required sample source voltages for the IC 555. The couple of outputs from this stage is responsible for the generation of square waves and triangular waves. The second stage which is actually the heart of the circuit consists of the IC 555. Here the IC is wired in a monostable mode with the square waves from the op amp stage applied to its trigger pin #2 and the triangular waves applied to its control voltage pin # 5. The square ...