Velleman EDU01 User Manual download pdf (Page 7)

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Pag. 7

Transistors

A transistor is an amplification device. By means of a small

current, a much larger current is controlled. Transistors come in

two flavours, NPN and PNP-types, depending on the polarity.

With this kit, you receive a BC557 (PNP) and a BC547 (NPN)

transistor. A transistor has 3 pins: Base, Emitter and Collector.

(Velleman part# BC557B, BC547B)

LDR (Light Dependent Resistor)

E B C

PNP

C B E

NPN

BC547

BC557

A Light Dependent Resistor behaves

like a resistor. The resistance various

on the amount of light falling on the

device, it decreases with increasing

light intensity.

Velleman part# LDR04)

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Velleman EDU01 User Manual Page 7