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Where exactly do you put the supply bypass capacitor? Is it between the + and - supply terminals of the circuit?The 9V supply needs a 220uF supply bypass capacitor to keep the 9V from jumping all over the place.
The circuit does not have a - supply. It has only a +9V supply and 0V. Connect the supply bypass capacitor close to the LM386 IC between +9V and 0V.
The datasheet for the Sony stereo amplifier IC is a horrible translation that is missing the supply voltage for the power vs distortion curve, and its output shows mV instead of mW. If it is 6V then the output power (?) at clipping is only 0.2W into 8 ohms per channel, exactly the same as an LM386 amplifier.
Its max distortion is a terrible 2.5% when the output is only 0.05W and is probably higher at a higher output power.
It was made for a cassette player (remember?) so maybe it is not made anymore.
If you can find a SONY CXA1622P, then it would be the best choice for your application. This IC has plenty of features for its class and works on 4 AA cells. Have a look at its datasheet. Do not use LM386 for your mini amp. It's a mono amp, noisy and working voltage range is high.
CXA1622P
**broken link removed**
Use of LM386 in modern eraI don't think Sony would use an American LM386 amplifier IC In their Japanese radio. The Sony amplifier IC is the same but is stereo or bridged.
I don't get what you mean there.. try with these batteriesLooks good but it can not possible work with no power supply.