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Old 25th June 2008, 11:48 PM   #1
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Default Feed-back class D

I am trying to modify an existing schematic (the PCB is already printed). This means I cannot modify too many things, except changing a few parts. I would appreciate some help in finding the best feedback configuration for this schematic.
As I said, no large modifications are possible (like replacing IC's),

Click the image to open in full size.

Please drow on this schematic
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Old 26th June 2008, 12:47 AM   #2
Pafi is offline Pafi  Hungary
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Here it is!
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Old 27th June 2008, 01:05 PM   #3
Pafi is offline Pafi  Hungary
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Thank you for the possibility for helping you!
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Old 27th June 2008, 08:26 PM   #4
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koszonom szepen ! Peter
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Old 5th July 2008, 08:15 PM   #5
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Hello. I'm back from vacation and ready to tackle the problems. This is how the amplifier works now
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Old 5th July 2008, 08:29 PM   #6
Pafi is offline Pafi  Hungary
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This is a nice way to describe the working of your circuit!

Your scope probe seems to have too much capacitance, you should have to change to 1:10 type, but othervise the 10k at the input of gate-driver is too high also. It's better to have much smaller impedances where you need fast changes. You could also increase the current of level-shifter.

Otherwise does it work more or less well?

I've just recognized: +/-120V ?!?
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