Bipolar Junction Transistor (BJT)
- switch when current flows B-E
- amplified current through C-E
- current controlled amplification
MOS-Field-Effect-Transistor (MOSFET)
- switch when voltage between G-S
- amplified current through D-S
- voltage controlled amplification
Transistors form the basis for digital logic
(1947 invented by John Bardeen & Walter Brattain at AT&T‘s Bell lab.)