Beginner Audio Amplifier Circuit Design: Basic vs Class D Schematics and Differences

The discussion addresses the design differences between basic Class AB and Class D audio amplifier circuits for a beginner in electrical engineering. Class AB amplifiers use transistor pairs operating in partial conduction to reduce distortion and overheating, typically implemented with BJTs or integrated circuits. Class D amplifiers operate with high efficiency (up to 98%) by processing digital signals and require more complex circuitry. Key design parameters such as output power and frequency response are essential and usually provided; if not, typical assumptions include 1-5 watts output and 50-10,000 Hz frequency range. For rapid prototyping without integrated circuits, simple Class AB amplifier schematics using BJTs are recommended, with resources available on Electronics Tutorials. An example of a basic Class A amplifier circuit using a TIP35C power transistor with minimal components and a 12V supply was also shared, highlighting the trade-offs in performance and complexity between amplifier classes.
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