However this page also covers a Transistor Buffer Amplifier.

The new address for this page is: http://www.interfacebus.com/transistor-buffer-amplifier-circuit.html

Design Note:

None of the circuits in this section show Vcc filter capacitors, called By-pass capacitors or Decoupling capacitors.

Good design practice dictates that every semiconductor or transistor have at least one by-pass capacitor from Vcc to ground.

In some cases as a transistor uses more than one Vcc tap an additional capacitor could be added, but may not be required.

A 0.1uF capacitor should work well in all cases, but depends on how noisy the Vcc line is.

If possible use short wires between components.

Background Reading;

2N2222 Transistor Data. [General Purpose NPN Transistor]

Transistor Terms. [Definitions that only relate to BJTs]

Capacitor Terms. [The dictionary section of the site that only covers capacitors]

How-to Decoupling Capacitor. [Capacitor By-passing]

Buffer Definition. [What is a Buffer]

Class A Amplifier Definition. [The main engineering dictionary on the companion site]

This section of transistor circuits serves a number of purposes;

Most are one transistor circuits so are viable for engineering uses and easy to build for the normal hobbyist.