[       ] - [Home] - [1] - [2] - [3] - [4] - [5] - [6] - [7] - [8] - [9] - [10] - [11] - [12] - [13] - [14] - [15] - [16] - [Next]

Transistor Action

Michael Gallagher
19th April 2019
Drawing freely from the the world wide web and elsewhere.
The graphics, for the most part drawn by the author,
are simplified, symbolic representations of reality.

An understanding of how transistors work is built upon an understanding of how silicon semiconductors conduct electrons:

[1] Formation of Pure Crystalline Silicon
[3] Pure Silicon does not conduct electricity
[4] N-doped Silicon conducts electricity via movement of loosely bound electrons
[6] P-doped Silicon conducts electricity via movement of electrons into holes
[8] How electrons around the junction behave when N and P-type silicon is fused

Semiconductor diodes block or allow current to pass:

[9] Diode action
[11] Diode Action Summary

Transistors amplify and switch current:

[12] NPN Transistor Action
[13] PNP Transistor Action
[14] Transistor Action Summary
[15] Current and Voltage measures for a BC547 NPN transistor in a circuit
[16] A test circuit for NPN and PNP transistors, used as switches