BJT Transistors - Electronics Switches and Inverters

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This video tutorial explains how Bipolar Junction Transistors can be used as electronic switches and as inverters. As a switch, a small current flowing into the base can be used to activate a larger current flowing in another circuit. As an inverter, it flips the output state. If the input is low, the output will be high. This video also explains how to use ohm's law and kirchoff's law to solve a simple NPN transistor circuit.

Transistors - NPN & PNP:


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:


Class A, AB, B, & C Amplifier Circuits:


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: