This electronics video tutorial provides a basic introduction into the Class A, AB, B, and C transistor amplifiers. The class A amplifier is the common emitter amplifier which uses a single NPN transistor. The Class B amplifier using two complementary NPN and PNP transistors and yields a higher amplifier efficiency. The Class AB amplifier uses two diodes to eliminate the crossover distortion that's present in the Class B amplifier. The Class C amplifier is a tuned amplifier with a high efficiency but with extensive distortion.

Transistors - NPN & PNP:
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BJT Transistors - Electronic Switches:
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Night Activated LDR Sensor Circuit:
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Finding The DC Load Line & Q-Point:
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Voltage Divider Bias Circuit:
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Collector Feedback Bias Circuit:
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Emitter Feedback Bias Circuit:
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Common Emitter Amplifier:
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Common Collector & Base Amplifier:
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Darlington Pair & Beta Current Gain:
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Voltage Gain of Transistor Amplifier:
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Multistage Transistor Amplifier Circuit:
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Transistor Audio Mixer Circuit:
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Operational Amplifiers:
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Summing Amplifiers:
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LM386 Audio Amplifier:
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LC Oscillator Tank Circuit:
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Final Exams and Video Playlists:
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Full-Length Videos and Worksheets:
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