What do you think about this amplifier,is it worth ?Here is a 4W audio amplifier from www.discovercircuits.com that is powered by 8 to 12 volts. If you intend to handle stereo you will need to consider building two such amplifiers.
If you are thinking of using a standard 9V transistor battery, you are going to have difficulty getting any useful life from the batteries.
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What will you choose ,TDA 2003 (3W 4Ohm before clipping) or this 4W AF amplifier ?