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Negative feedback - right or wrong to use?
Negative feedback - right or wrong to use?
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Old 5th December 2017, 09:41 PM   #41
banat is offline banat  Serbia
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Hi sottomano ,thanks but I`m not interested .
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Old 6th December 2017, 05:51 PM   #42
cbdb is offline cbdb  Canada
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Is a class D (PWM) amp even possible without feedback?
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Old 6th December 2017, 06:38 PM   #43
banat is offline banat  Serbia
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Good question !
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Old 6th December 2017, 08:50 PM   #44
PRR is offline PRR  United States
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Quote:
Originally Posted by cbdb View Post
Is a class D (PWM) amp even possible without feedback?
Yes.

If fast (>1MHz) devices are available, it may be more linear than most simple baseband amplifiers, avoiding device nonlinearity by bang-bang on/off conduction.
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Old 6th December 2017, 10:58 PM   #45
jan.didden is online now jan.didden  Europe
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Quote:
Originally Posted by banat View Post
Hi Jan
-Cutting vinyl with cutterhead powered from GNFB-free amp is possible , our DIY member Atmasphere already is doing that for many years
Yes I am sure it is possible, you probably can build a whole audio system with no GNFB. But what is your point?

Jan
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Old 6th December 2017, 11:09 PM   #46
traderbam is online now traderbam  Europe
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Quote:
Originally Posted by cbdb View Post
Is a class D (PWM) amp even possible without feedback?
I designed and built one in about 1979! I was just a teenager with no formal electronics education but I made a PWM using a lateral MOSFET. It worked. It had no feedback. It did not sound so good but worked ok at low volumes. I thought I had invented something new until later on when I found out what a switch mode power supply was.

It is evident that Hypex thinks that an awful lot of NFB is required to make a good enough sound. Class D reduces power dissipation. That's where it excels.
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