1. Objective: The activity aims to present the basic configuration and functions of a small signal amplifier. 2. Intended Learning Outcomes: The students shall be able to: 1) examine the amplifier concept and its circuit construction 2) Interpret labels used for dc and ac voltages and currents 3) To learn the general operation of a small-signal amplifier 3. Discussion: In order for the transistor to operate properly as an amplifier, the two pn junctions must be correctly biased with external dc voltages. The operation of the pnp is the same as for the npn except that the roles of the electrons and holes, the bias voltage polarities, and the current directions are all reversed. The biasing of a transistor is purely a dc operation. The purpose of biasing is to establish a Q-point about which variations in current and voltage can occur in response to an ac input signal. In applications where small signal voltages must be amplified such as about the Q-point are relatively small. Amplifiers designed to handle these small ac signals are often referred to as small-signal amplifiers. A transistor can be configured in three general ways. The emitter can be grounded for signal, the base can