Elenco Circuit Maker Sound Plus 200 - Manual (Page 34)

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Project #58
There are three connection points on an NPN transistor (Q2), called base
(marked B), emitter (marked E), and collector (marked C). When a small
electric current flows from the base to the emitter, a larger (amplified)
current will flow from the collector to the emitter. Build the circuit and
slowly move up the adjustable resistor (RV) control. When the LED (D1)
becomes bright, the lamp (L4) will also turn on and will be much brighter.
NPN Amplifier
Project #59
The PNP transistor (Q1) is similar to the NPN transistor (Q2) in the
preceding project, except that the electric currents flow in the opposite
directions. When a small electric current flows from the emitter to the
base, a larger (amplified) current will flow from the emitter to the collector.
Build the circuit and slowly move up the adjustable resistor (RV) control.
When the LED (D1) becomes bright, the lamp (L4) will also turn on and
will be much brighter.
PNP Amplifier
CM-200_Manual_031914.qxp_CM-200_Manual_031914 4/2/14 12:04 PM Page 34