Emitter Follower Common Collector NPN Bipolar Junction Transistor BJT circuit basics

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).

2N2222 NPN BJT emitter follower amplifying voltage divider current beginner learning electronics Click here to watch directly on YouTube!

  • 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!

Emitter Follower AKA Common Collector NPN Bipolar Junction Transistor BJT circuit plus PNP Offset Canceling Diagram
Emitter Follower AKA Common Collector NPN Bipolar Junction Transistor BJT circuit plus PNP Offset Canceling Diagram

Video below: Transistor circuit 11 2N2222 MJE182 NPN emitter follower common collector supercapacitor charger. Click here to watch directly on YouTube!

2N2222 and MJE182 with heat sink NPN Bipolar Junction Transistor BJT common collector aka emitter follower circuit used to control output voltage diagram
2N2222 and MJE182 with heat sink NPN Bipolar Junction Transistor BJT common collector aka emitter follower circuit used to control output voltage diagram

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