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Colin's circuit with the LM386 amplifiers has both of them missing the very important 10 ohm resistor in series with a 47nF capacitor to ground at the outputs as shown on every circuit in the datasheet.
Don't argue with me about leaving the important inexpensive zobel network off.
I will probably do this, but two questions: would this work with pn2222's (I have a bunch), and would this work on a 5 volt supply?