Velleman EDU01 User Manual download pdf (Page 17)

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Required parts: 9V battery*, 1K resistor (brown black red gold), 100K resistor (brown

black yellow gold), red LED, BC547 transistor, buzzer, 0,5m supplied wire.

How it works: An alarm sounds when the

normally closed security circuit (here

indicated as ‘WIRE’) is interrupted.

Replace this normally closed circuit

(WIRE) by a normally closed window or

door switch; when e.g. the window is

opened the contact within the window

switch is interrupted, the security circuit is

opened and the buzzer sounds.

The alarm signal ends as soon as the

security circuit is closed again.

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Velleman EDU01 User Manual Page 17