NPN Amplifier

Project Number: 124

OBJECTIVE: To compare transistor circuits.

Description: There are three connection points on the NPN transistor (Q2), called a base (marked B), emitter (marked E), and a collector (marked C). When a small electric current flows from the base to the emitter, a larger (amplified) current will flow from the emitter to the collector to the emitter. Build the circuit and slowly move up the adjustable resistor (RV) control. When the LED (D2) becomes bright, the lamp (L2) will also turn on and will be much brighter.