Electronics return

What type of signal is produced by the alarm transmitter circuit?

• laser

• Infrared

• Audio

• Semaphore

In the alarm circuit, these act as switches:

Label all the transistors

Find all the capacitors:

a

b

c

d

e

C5

C4

C1

C3

C2

Reorder the following with the smallest value colour on the left:

• Black

• Red

• Orange

• Blue

• Violet

Which of these can be placed any way on a PCB?

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Which of these should only be placed in one direction on a PCB?

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Match the following

• 9v battery holder

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• Diode

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• Ceramic capacitor

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• Electrolytic capacitor

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• DIL socket

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The ​ (a)   on the alarm transmitter charge and discharge, switching the ​ (b)   and in turn creating a ​ (c)   wave.

• capacitors
• transistors
• square
• sine
• diodes
• resistors
• LED's

Which power supply will we use for these?

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