This is a simple project by National Semiconductor’s LM3886 power amplifier chip. I bought the chips and did some research online. The typical circuit is so simple. A single channel can easily reside on a small circuit board (see above).
With less than 10 additional passive components, the project is done.
I just duplicated the first channel and made a stereo power amplifier. The two power chips are mounted on a single head sink. Don’t forget to put insulation on the heat skin of the two chips to prevent any unnecessary short circuit or surprise.
The power supply is a simple one. Just a 200V 5A bridge rectifier mounted on the case of the amplifier.
For the capacitor bank, I searched through my component drawer and found six 3300uF caps. Parallel them and it is done.
Put them together and stuffed in a compact case.
It is done!
Put it beside my modified X-10D. I chose a blue LED as its power indicator. Quite cool.
I still have a pair of brand new LM3886 chips with me. I don’t think I will use them. If you want to build the same project, please leave a comment to this post.
I will mail them to you.
<2013 Jan 22> The two chips have been reserved to Jon. He posted the first comment. I will mail the chips to him.