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Re: "Split feedback" amplifier topology:

149.221.239.117

Posted by Charles Altmann on November 27, 2000 at 03:57:51

In Reply to: Re: "Split feedback" amplifier topology: posted by klaus on November 26, 2000 at 07:36:25:

"Seems like the opposite. Section B with four devices runs 8 Ohm speaker, section A should be loaded with 8*4=32 Ohm, to equalize current for each device. After all, it's not safe to load any single transistor pair with 2 Ohms where the designer puts 5 pairs."

Hi Klaus, you are right.
I have not loaded the (A) stage at all (in my own splif amp).

If you read my article til the end, there is another example shown for a smaller amp modification "add a pair". This can be done with little parts and efforts.
In my amp (4+1 pairs) the insertion of the splif topology did not increase power consumption at all, since heavy loading of the feedback pair is indeed not required.

The really cool thing is the feedback switch, so you can switch feedback on and off. If the switch is closed, you have a regular amplifier without any compromise, open the switch, you have removed feedback from the loudspeaker and have a splif amp.

This way, you can really try out, if you like the feedback or not.

;-)

Thanks, Charles.

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