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dunndatt dunndatt is offline

diyAudio Member

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  • About dunndatt
    United States


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General Information
  • Join Date: 14th August 2005


View dunndatt's BlogRecent Entries
Latest Blog Entry

Posted 29th March 2012 at 04:56 AM by dunndatt Comments 4
Years ago when getting started into DIY audio, I picked up three different chip amps from my local electronics shop. They were cheap and easy enough to build according to the data sheets, so I had a go at them. To my dismay, they sounded HORRIBLE! I couldn't figure out what went wrong until I really started digging into the data sheets.

While I didn't build the LM3886, I'm going to pick on it since it is a very common chip amp:
National Semiconductor LM3886 (from, bought out by
Claims 68watts into 4ohm speakers with 0.1% THD+N from 20-20kHz

National did pretty good with most of their claims, but I'll focus on something that stands out: The Distortion Vs. Power graphs. (As a comparison, I discovered that one of my other chip amps did their power testing at 10% distortion... which is pitiful. Every chip amp data sheet I've looked at has some kind of failing with this graph.)

Recent Comments
Originally Posted by rjm
You are decreasing the
Posted 10th April 2012 at 05:56 AM by dunndatt dunndatt is offline
It's still difficult...
Posted 3rd April 2012 at 02:32 PM by rjm rjm is offline
Yeah, you're right....
Posted 31st March 2012 at 12:25 AM by dunndatt dunndatt is offline
You're not clear on...
Posted 30th March 2012 at 09:24 AM by Shaun Shaun is offline
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