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dunndatt dunndatt is offline

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  • Join Date: 14th August 2005

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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 national.com, bought out by ti.com)
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.)

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Recent Comments
Quote:
Originally Posted by rjm
You are decreasing the
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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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