Transistor Amplifiers - Class A, AB, B, & C Circuits

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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:


BJT Transistors - Electronic Switches:


Night Activated LDR Sensor Circuit:


Finding The DC Load Line & Q-Point:


Voltage Divider Bias Circuit:


Collector Feedback Bias Circuit:


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Emitter Feedback Bias Circuit:


Common Emitter Amplifier:


Common Collector & Base Amplifier:


Darlington Pair & Beta Current Gain:


Voltage Gain of Transistor Amplifier:


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Multistage Transistor Amplifier Circuit:


Transistor Audio Mixer Circuit:


Operational Amplifiers:


Summing Amplifiers:


LM386 Audio Amplifier:


LC Oscillator Tank Circuit:


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Final Exams and Video Playlists:


Full-Length Videos and Worksheets: