Feedback around TDA8950

lumanauw · 27th December 2009, 02:45 AM

TDA8950 is intended to be open loop operation with fixed gain of 30dB.
What will happen if we put UCD style feedback for target gain of 20dB, meaning only 10dB is reserved for feedback, will it do more harm than merit?
Bruno himself stated that if we want to use feedback, use tons of it, and 10dB is certainly not much.

Ltralus · 27th December 2009, 03:56 AM

Why don't you tell us once we've tried it and then you can share our results with us.

lumanauw · 27th December 2009, 04:00 AM

I got another idea, is it possible to use external comparator (like 3116), put UCD loop around it, inject the result to pin 1 of TDA8950 (OSC), not using it's +input and -input.
So TDA 8950 is only for power stage.

27th December 2009, 02:45 AM	#1
lumanauw diyAudio Moderator Emeritus Join Date: Oct 2002 Location: Bandung	Feedback around TDA8950 TDA8950 is intended to be open loop operation with fixed gain of 30dB. What will happen if we put UCD style feedback for target gain of 20dB, meaning only 10dB is reserved for feedback, will it do more harm than merit? Bruno himself stated that if we want to use feedback, use tons of it, and 10dB is certainly not much.

27th December 2009, 03:56 AM	#2
Ltralus diyAudio Member Join Date: Dec 2009 Location: office	Why don't you tell us once we've tried it and then you can share our results with us. __________________ James J.

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27th December 2009, 04:00 AM	#3
lumanauw diyAudio Moderator Emeritus Join Date: Oct 2002 Location: Bandung	I got another idea, is it possible to use external comparator (like 3116), put UCD loop around it, inject the result to pin 1 of TDA8950 (OSC), not using it's +input and -input. So TDA 8950 is only for power stage.

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