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Old 10th March 2007, 05:06 PM   #1
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Default LM1875 noninverted

I want to ask you guys if this would work!!

Thanks
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Old 10th March 2007, 05:31 PM   #2
bigwill is offline bigwill  United Kingdom
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Positive feedback?

I am not an expert but I don't think this will work due to the way the feedback is wired, but I'm willing to accept that I may be wrong.
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Old 10th March 2007, 05:54 PM   #3
phn is offline phn  Sweden
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That's basically an inverted design with the chip mounted wrong.

I don't think it will work.
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Old 10th March 2007, 05:58 PM   #4
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What should then be changed to have it noninverted. Maybe just without the feedback??
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Old 10th March 2007, 06:09 PM   #5
phn is offline phn  Sweden
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http://www.geocities.com/rjm003.geo/...io/diy_gc.html
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Old 10th March 2007, 06:15 PM   #6
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Put R2 between the output and the - input (pins 2 and 4). Connect R1 between the + input and ground; connect the right side of C1 to the + input. The gain will be 1 + R2/R3 = 21
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Old 10th March 2007, 06:31 PM   #7
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I did that! Thanks! Just made a pcb. I have just one more question: how does reflect an inverted input on output in audio way. I know that signal is inverted but how is than amp like this heard. Maybe a stupid question but I really don't know this.

Thanks
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Old 19th April 2007, 03:35 PM   #8
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I Just made this amp today.It sounds good! I come from China !
This amp can work !
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Old 20th April 2007, 12:07 AM   #9
AndrewT is offline AndrewT  Scotland
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Quote:
Originally posted by AmpFromChina
I Just made this amp today.It sounds good! I come from China !
This amp can work !
if you made this amp today then you are telling us lies about how good it sounds and that it works!!!

A chip amp arranged for inverted mode but with swapped inverting and non-inverting input pins will not work as an amplifier. It cannot sound good. It cannot work !
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regards Andrew T.
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