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Old 20th March 2008, 12:59 PM   #11
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Hi Ozgur,

What's R3 for? There is no capacitor for low pass filter...


Cheers,

Nesa
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Old 20th March 2008, 02:33 PM   #12
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Andrew, the PGA is capable driving 600 Ohm.
But I presume Dxs question is different and I can't answer that.
From my opinion most of the Gainclone buffering is technically unjustified and maybe driven by the pleasant extra distortion most of the buffer circuits may provide.
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Old 22nd March 2008, 08:55 AM   #13
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Ok...
Concerning the LM4562 unity gain problem;
Click the image to open in full size.
It seems there is no problem on unity gain without a resistor on NFB line..

And this is the last situation of my circuit;
Click the image to open in full size.

As you can see, RC circuits fixed...
Do you have any additional advice?
And my "question" is still actual: do I need a buffer before LM3875?

Thanks

PS: R5 is still 20K
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Old 26th March 2008, 01:30 AM   #14
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the PGA contains an output amplifier, there is no need for a buffer
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Old 28th March 2008, 09:08 AM   #15
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OK..
This is what I need.
THX.
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