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Discussion Starter #1
Here I went with the higher power LM3886 chip from National Semiconductor.

 

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With the lid on, a nice simple and clean 130 watt amplifier.

 

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Then I went for the more compact design.

 

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All together now.

 

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And last, but not least, powered on. Have I mentioned I love blue light?

 

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i've been building quite a few iteration of the lm3886 for a few years now.
from the simple inverted, non inverted, buffered, valve buffered, regulated, to the more complex current iteration of the multiloop/current pump lm3886.





they sound really nice. my current resident amp powering my HT setup is based on a bridged, balanced lm3886.
though i could afford poweramps from onkyo, marantz, rotel, emotiva and the such, i still prefer to DIY for the fun (flexibility) of it.
 

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I kinda dig those, guys. Especially the blue light. But seriously, those LM3875 and LM3886 have been favorites of mine for a long time. Inexpensive, easy to design with and great sounding!

I must say, I've never taken a liking to the T-amps. Even though the technology is interesting and makes sense, I just don't like them. But the LM38xx amps are more my style. Hard to say if this gives me a preconceived notion or not, but I do think they sound better.
 

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I cannot BELIEVE how beautiful your builds are. You must have some metal working gear around. Wow!

I could probably drive headphones with a pair of those without even heat-sinking the cases. There are some nice made-up board and power supply combos out there for under $40 a set. Anyone have experience with them?
 

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Here is a link to the Data Sheet.

Observations:
  • Looks like a fairly typical integrated circuit design.
  • Open loop gain not super high, high enough for low distortion. Some say you do not want it to be too high, it won't sound as good.
  • Protection from almost any fault condition, load, heat, supply voltage, input, you can't hurt the thing.
  • Connect directly to a heat sink, requires no external power transistors.
  • Super stable.
  • All linear class A/B design.
  • Good slew rate, good full-power performance at high frequencies.
  • Minimum additional components needed for a complete power amp.
  • Great specs all around, extremely flexible.
 
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