5- Common Collector Amplifier

Ever wonder how to connect a high-impedance source to a low-impedance load without distorting the signal? You need an Emitter Follower! In this electronics lab, we build and test a Common Collector (CC) Amplifier. While it looks like a Common Emitter circuit, the CC has unique properties—specifically, high input impedance, low output impedance, and a voltage gain of unity (Av approx 1). Let’s prove the theory on the workbench!

[What You’ll Learn]
- The Theory: Why it’s called an "Emitter Follower" and how it acts as an impedance transformer/buffer.
- Circuit Setup: Biasing the transistor for Common Collector operation (Rc = 0, output taken from Emitter).
- DC Measurements: Verifying the DC operating point (VB, $VE, VC).
- AC Measurements & Waveforms: Using the oscilloscope to measure Vin vs Vout to prove Av = 1 and observe no phase inversion In-Phase signals).

[Equipment Used]
- NPN Transistor (e.g., 2N2222 or BC547)
- Function Generator
- Oscilloscope
- Digital Multimeter
- Breadboard & Components

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Видео 5- Common Collector Amplifier канала Menna Academy