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The new datasheet has a graph of power supply noise rejection produced by the bypass capacitor. The power supply hum is at 50Hz to 120Hz so an electrolytic 10uF to 100uF capacitor should be used. This bypass capacitor does not affect extra boost or not.
A server error will not allow me to...
The datasheet of the LM386 amplifier shows a "bypass" capacitor at pin 7 to ground. These capacitors are missing in your circuit and their function is to reduce most power supply noise. Add them to reduce the hum from your amplifiers that have their gain much too high (200 times).
The LM386...
In post #9, he said that when the input cable was disconnected, "no noise heard".
Then either the shielded cable had its shield disconnected, or too much of the signal wire was not shielded, or the shielded cable was junk.
Years ago when Radio Shack was in every mall I bought an expensive...
Your parts on the schematic are much too far apart making them appear too tiny to see.
The middle opamp is dead because it is missing a DC input bias voltage
The LM386 amplifier IC produces 1W into 8 ohms when powered from 9VDC. But then it is clipping like crazy with very high distortion. Barely clipping, its output power is 0.56W and its distortion is fairly low.
When its speaker is 4 ohms then its heating almost doubles but its output power is...
Is the battery a dangerous Lithium-Ion type? The 4.2V is its maximum allowed charged voltage.
To prevent a fire and explosion, you need a proper charger circuit to replace the Battery Management IC.
A piezo transducer strongly resonates at a frequency between 3kHz and 6kHz. If you feed it with a 1kHz squarewave then most of its output will be at its odd harmonic number of 3kHz or 5kHz.
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