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Bone 26th November 2008 05:58 PM

Hi everyone,

Has anyone used this chip to build a stereo amp?
Is it 2 x LM1875 in one package? It has similarities.

If you have used it how does it sound?
and does anyone have a PCB layout they are willing to share please?

Thanks and regards Tony.

pacificblue 26th November 2008 07:58 PM

I use one for my PC speakers.

It is not 2 x LM1875 in one package. It has similar power rating, but the equivalent schematic looks more advanced, as do the specs.

How does it sound? That is a difficult question, because it depends on the application and the speakers.

When I finished it, I compared it to my living room amp (of course). That was quite unfair, because my LM1876 is supposed to be used for near-field listening at low listening levels. So it has a very small power supply that limits its output to about 2 x 5 W into 8 Ohm.

At first the LM1876 showed more or less what people discuss a lot here, a slight lack of punch. That was with 1000 F per rail. After increasing that to 6800 F there is nothing missing anymore.

What strikes me most is that it seems to give rhythm to the music. Now what does that mean? While my other amplifier makes you want to sit still and listen, the LM1876 makes you want to get up and move. I verified this with several different speakers, but have no idea, where that effect comes from. Other than that there is nothing unusual about it. The frequency response is as flat as can be, THD is low, accuracy is high, power output is reasonable, staging is credible. A recommendable IC.

My PCB files got lost, when I got a new PC. Somehow missed them, when I copied everything else. Anyhow it was not based on a complete and well-designed schematic that would have been good for sharing. Just a quick-'n'-dirty DC coupled amp with PSU on board.
But how about the evaluation board from National themselves?


e_fortier 26th November 2008 10:44 PM

Does the 1875 makes you want to get up and move...

I just bought a kit from e-bay so I was wondering.


pacificblue 27th November 2008 07:59 AM

Sorry, I have no personal experience with the LM1875.

santik 16th February 2011 11:40 AM

pacificblue, you should share your schematics for us to see... ;)

AndrewT 16th February 2011 12:38 PM


Originally Posted by pacificblue (
I have no personal experience with the LM1875.


Originally Posted by santik (
pacificblue, you should share your schematics

are you asking the possible or the impossible?

santik 17th February 2011 10:43 AM

oh, I meant LM1876.

pacificblue 17th February 2011 06:49 PM


you already got an answer to your PM. The last chapter of post #2 is still valid.

santik 18th February 2011 02:32 PM

thanks for your reply pacificblue.

I will go on designing my amp... if I have any questions I would post it here and PM you...

thanks ;)

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