A while back i was interested in building a set of low cost computer speakers. I found that there were plenty of low cost speaker drivers available but that most of the amplifiers were 2.1 setups and were around 100 dollars, which was quite a bit more than i wanted to spend for speakers for my work computer. After a little more research I came accross T-amplifiers which have become pretty popular with the DIY crowd and purchased a cheap lepai amplifier on ebay which sounded ok but nothing special and later it broke because i accidentally shorted it out (none of these little DIY amplifiers have a protection circuit like a receiver does that shuts them off when you touch the red and black wires together accidentally so be careful). After a little more research i decided to give the sure-electronics 15 watt amplifier a try, the numbers were good and so was the price 15-16 dollars for 15 watts @4 ohms. When I got the amplifier the quality impressed me, as did the performance. For 15 dollars i can’t think of a better amplifier, hell it even powered a set of klipsch rf-5′s to a good volume level (very efficient speakers) . Either way if you are looking for a low cost option for a DIY stereo project i can’t recommend these enough. The amplifier is powered by a 12v power supply which you can purchase from many electronics suppliers or you can run this thing for a long time on a smaller 12v battery and use it outdoors etc.
They can be purchased from parts express or directly from sure
parts-express might be the way to go as shipping directly from sure takes almost a month since they come from hong kong.