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Design:

Output Power: 0.5W into 8Ω (9V battery).
Voltage Range: 4V – 12V DC.
Key Features: Fixed gain of 20 (up to 200 with capacitor), tiny footprint, through-hole DIP-8 package.

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Use Class AB amplifiers for high-power audio applications.
Use Op-Amp amplifiers for high-gain, low-distortion audio applications.
Use Class A amplifiers for simple, low-power audio applications.

While the book covers various designs, a "practical" staple in such projects is the LM386 low-voltage power amplifier, often featured in hobbyist guides: Design: