Single Differential Non-feedback
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 4th September 2004, 02:58 PM #1 lumanauw   diyAudio Moderator Emeritus     Join Date: Oct 2002 Location: Bandung Hi, Lars Clausen, You are very good with non-feedback power amp design. Just a question. Is it possible to make a non-feedback power amp with just one/single differential? Will it bad in DC offset compared to complementary differential non-feedback power amp?
 4th September 2004, 04:12 PM #2 Lars Clausen   diyAudio Member   Join Date: Oct 2003 Location: The Lab lumanauw: Quite impressive website you have :-) I think you can make the single differential NFB amp, i didn't build it, but something like this should work: Gain is (R1+R2/330) * (R3+500) / 1000 with shown values approx 120.
lumanauw
diyAudio Moderator Emeritus

Join Date: Oct 2002
Location: Bandung
Hi, Lars,
Thanks. I made it years ago. But it is not for guys like you, since I'm still learning here.
Is there any problem with DC offset stability with single differential non-feedback power amp?

I also a question about other possibility. You like to put big RE (emitor resistor), like in differential to lower local gain. I learned here, that lower local gain can be also made by putting R from collector to base(with base resistor offcourse), to make local feedback. Is this a good option for making non-feedback power amp besides putting big RE?

It is nice that you share an equation of non feedback.
Quote:
 Gain is (R1+R2/330) * (R3+500) / 1000 with shown values approx 120.
R1+R2 (not R1//R2, right?)/330 I understand. The 500 comes from 1k DC pot/2, right?. But where the 1000 comes from?

 5th September 2004, 03:29 AM #4 lumanauw   diyAudio Moderator Emeritus     Join Date: Oct 2002 Location: Bandung Hi, Lars Clausen, What do you think of Error Correction (EC) like Hawksford?

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