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Old 27th July 2014, 02:18 PM   #1
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Default Auxiliary Amplifier Application Circuit

TI's LM chips seem to have both a Typical Application Circuit and an Auxiliary Amplifier Application Circuit shown in the datasheet.

After searching, I can find references to people using either of the circuits, but nothing specifically illustrating the reason for the differences in the circuits.

I can speculate as to the differences, but I thought it would be appropriate for someone more knowledgeable to outline this, as I'm sure it comes up when other novice folks are thinking about making their own design.
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Old 28th July 2014, 02:37 PM   #2
JMFahey is offline JMFahey  Argentina
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Please post some specific example
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Old 28th July 2014, 06:42 PM   #3
Mihkus is online now Mihkus  Estonia
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Typical application has minimal amount of components and sometimes even missing few..
But auxiliary amplifier application circuit has all and even extra for maximum performance.
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Old 29th July 2014, 11:19 AM   #4
AndrewT is offline AndrewT  Scotland
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Auxiliary?
do you mean: single supply application?
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Old 29th July 2014, 07:11 PM   #5
Mihkus is online now Mihkus  Estonia
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Nope. Check LM1876 datasheet...
Attached Images
File Type: png typ.PNG (34.8 KB, 84 views)
File Type: png auxs.PNG (29.6 KB, 83 views)
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Old 30th July 2014, 08:42 AM   #6
blu_glo is offline blu_glo  England
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May I suggest that you use the "auxiliary" circuit as it contains the best component setup to get you working with minimal fuss it's what I used in my chip amp circuits. Ci could be 47uf non polarised electrolytic for even better bass response. ...

Last edited by blu_glo; 30th July 2014 at 08:45 AM.
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Old 30th July 2014, 04:32 PM   #7
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What's that RL circuit at output all about? Not like other Zobels I've seen.
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Old 30th July 2014, 04:37 PM   #8
Mooly is offline Mooly  United Kingdom
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Adding an inductor in series with the output is common practice on many amps, indeed some would go as far as to say its an essential component. Its function is to isolate the amplifier output from purely capacitive loading which (on many amplifiers) can provoke destructive instability. The resistor damps any ringing that appears when squarewave testing amps.
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Old 30th July 2014, 04:44 PM   #9
blu_glo is offline blu_glo  England
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LOL I just noticed it says its a 0.7uF, surely they mean uH?!

indeed, as Mr. Mooley suggests it is normal safety practice to include the RL network.

Rsn must be high power carbon or film type 2W or greater, NOT wirewound of any form....

Last edited by blu_glo; 30th July 2014 at 04:48 PM.
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Old 30th July 2014, 05:21 PM   #10
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Henries, Farads, whatever .

So would this mitigate the need for Zobel?

I was going to say something about transient time, but it looks like that would be on the order of less than 1 uS.
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