Emitter follower aka. common collector circuits take an input voltage (minus B-E transistor drop or other possible voltage drops) and output the same voltage to the load. The circuit is generally used to deliver more current than the signal can provide (current/power amplification).
- Large input impedance and small output impedance (more current can be provided than the signal source can provide)
- Voltage gain of 1 (voltage out is about the same as voltage in)
Video below: Transistor circuit 12 2N3904 NPN BJT emitter follower cascaded with 2N3906 PNP BJT to cancel offset Click here to watch directly n YouTube!
Video below: Transistor circuit 11 2N2222 MJE182 NPN emitter follower common collector supercapacitor charger. Click here to watch directly on YouTube!
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