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

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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