Velleman EDU01 Manual do Utilizador descarregar pdf (Página 13)

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Pag. 13

Required parts: 9V battery*, 1K resistor (brown black red gold), 470K resistor (yellow

purple yellow gold), red LED, BC547 transistor, wire jumper.

How it works: In this circuit, the small

current flowing through your finger will be

amplified by the transistor.

The base current that runs via your finger

and resistor R1, is amplified by transistor T1.

The amplified current flows through the LED

and R2 making the LED lit.

R3 will prevent the transistor for unwanted

functioning.

HINT: wet you finger to make the LED

light up stronger.

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Velleman EDU01 Manual do Utilizador Página 13