D2822 1W Amplifier
There's an IC called a TDA2822 typically rated to drive speakers at around 3W. It's been around so long that on many sites it is listed as obsolete!
It's even used in a few cheap amplifiers available online for very few dollars.
Nonetheless, there is also a facsimile of the chip (I think) to be found called the D2822. It has a separate but similar datasheet - topping out around 1W and also touted for headphones and similar cheap amplifier applications. The pinouts for both chips seem to be the same.
I used the circuit shown in the datasheet and the pinout given as well to make an audio amplifier as follows.
At first I tried rubbish little speakers which were suitably horrible, but then I grabbed a couple of recycled speakers and the sound was actually quite remarkable coming from a tiny little 8-pin "obsolete" chip that barely gets warm as it cranks out the phat beats.
The video is a little loud in places (sorry!) as I have a new phone and keep hitting "volume up" instead of "volume down" and vice versa!
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