Data Sheet

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9. Warning Alarm

Build the circuit to the left and turn on the switch (62).

You will hear an alarm sound from the alarm (78). This

type of device could be used to create an audio signal if

you need help.

10. House Alarm

Replace the switch (62) with the reed switch (83), then

touch the reed switch (83) with the magnet (7); you

will hear the alarm (78) sound. This simulates a house

alarm triggered by motion sensing.

11. Morse Code

Replace the switch (62) with the press switch (61),

then press the press switch (61). You will hear the

sound from the alarm (78) whenever you press the

press switch (61). This can be used as a Morse code

typing simulator. Morse code uses various sequences of

long and short on-off tones, lights or clicks to represent

letters, numbers, and text. Since World War II, the

process for sending messages using signal lamps has

barely changed. It requires someone trained in Morse

code to operate the lamp’s shutter by hand, receiving,

decoding, and replying to messages.

Morse Code

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