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Chip Amps Amplifiers based on integrated circuits

TDA7052A speaker mic ground
TDA7052A speaker mic ground
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Old 21st May 2014, 08:23 PM   #1
Copper Dog is offline Copper Dog
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Join Date: Oct 2012
Default TDA7052A speaker mic ground

Hi All;

I have an existing mixer circuit that uses an LM386 as the final stage. This has been redesigned to use the TDA7052A. The output of the circuit is to a speaker microphone which, in the original design uses the same ground point as the speaker for the transmit function (a short to ground when you press the transmit button).

The TDA7052A however uses an (open drain?) to ground for the negative terminal of the speaker. Can anyone tell me if this is a constant source to ground for the speaker? Will I intermitantly lose the path to ground for my speaker microphone function as the 7052's internal opamp's do there thing? I don't have a TDA7052 in DIP to breadboard this.

Thought I'd throw it out here.
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Old 21st May 2014, 09:57 PM   #2
Art M is offline Art M  United States
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Join Date: Oct 2010
Location: SF Bay Area
Looks like a B.T.L output stage. Neither output has a fixed connection to ground. With no signal both output terminals "float" at supply mid point.
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Old 22nd May 2014, 12:02 AM   #3
Copper Dog is offline Copper Dog
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Join Date: Oct 2012
Yeah this is what I see as well. I have a very bad feeling that while the speaker will operate normally, the push to talk will fail without a direct path to ground and I see no way around it short of rewiring the mic and thats not a viable option. This project is (was) ready for PCB however I noticed this possible design flaw just recently. Without testing it I can't be sure it 'won't' work but it looks doubtful. I think I have a serious problem.
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