wizard
Member
Hi,
Can somebody explain me if the below link is just a class D amplifier or what is called 'PWM' amplifier?
https://www.electro-tech-online.com/custompdfs/2008/12/MC68EZ328PWM.pdf
I know something about class D amplifiers, But not sure about the above link.
Besides, yesterday I made a Plasma arc speaker based on TL494 PWM chip.
It worked just fine and I was able to hear the Modulated music via the arc at 30 KV (the attached picture).
With the exception of the arc itself, I was wondering how a PWM modulator will work when the input is an audio frequency signal (sine wave for simplification)? Yes, I do know that PWM is modulation of duty cycle, but I am not sure about the output of the PWM with sound??
My main question:
As PWM is like 'AM' (both will affect the amplitude), Can I suppose that we will have any SIDEBAND on the output of the PWM like what we have on the output of acommon amplitude modulator?
Unfortunately I forgot to analyse the output of said PWM with my spectrum analyzer.
Thanks a bunch
Can somebody explain me if the below link is just a class D amplifier or what is called 'PWM' amplifier?
https://www.electro-tech-online.com/custompdfs/2008/12/MC68EZ328PWM.pdf
I know something about class D amplifiers, But not sure about the above link.
Besides, yesterday I made a Plasma arc speaker based on TL494 PWM chip.
It worked just fine and I was able to hear the Modulated music via the arc at 30 KV (the attached picture).
With the exception of the arc itself, I was wondering how a PWM modulator will work when the input is an audio frequency signal (sine wave for simplification)? Yes, I do know that PWM is modulation of duty cycle, but I am not sure about the output of the PWM with sound??
My main question:
As PWM is like 'AM' (both will affect the amplitude), Can I suppose that we will have any SIDEBAND on the output of the PWM like what we have on the output of acommon amplitude modulator?
Unfortunately I forgot to analyse the output of said PWM with my spectrum analyzer.
Thanks a bunch
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