Feeding people Nonsense

[Raven Luni]

Greetings,

I figured this was better in off topic. I came across this circuit which is supposedly for a 'pure sine' inverter. I might not be that knowledgeable but this is complete and utter nonsense am I right?

http://homemadecircuitsandschematic.../12/how-to-build-pure-sine-wave-inverter.html

 

[(*steve*)]

Using PWM to generate a pulse train that is the equivalent of another waveform is a reasonable thing to do.

Whether that circuit does it is another matter. My largest concern is that the PWM simulates an actual sine wave. But even if it's a triangular waveform, it's going to be a lot closer than a square wave.

Using PWM means the efficiency will be higher than if you were using another method to generate the waveform.

 

[Raven Luni]

What got me was that hes using the square wave output to trigger a 555 pulse with the (in sync) triangle output going to the reference and claiming it generates a neat set of varying pulses for both halves of the cycle - bollox! 1 pulse, 1 width, 1 half cycle.

 

[Raven Luni]

It's a public forum - you're not interrupting anyone - besides I'm already interrupted (or is that disturbed?)