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DUAL TRANSISTOR MULTIVIBRATOR CIRCUIT EXAM QUESTION |
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V. Ryan © 2004 - 2009 | ||||||||||||||||||||||||||||
PDF FILE - CLICK HERE FOR PRINTABLE WORKSHEET BASED ON QUESTIONS BELOW |
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A local garage has started selling a small electronic
device. The device has two LEDs that flash alternately and the entire
circuit is housed in a small moulded case. It is to be placed on the
‘dashboard of a car so that it looks as if an expensive alarm has been
fitted. |
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Three of the important components have been labelled A, B and C. Name each component and explain the function of each in the circuit. |
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COMPONENT A: | ||||||||||||||||||||||||||||
FUNCTION IN CIRCUIT: | ||||||||||||||||||||||||||||
COMPONENT B: | ||||||||||||||||||||||||||||
FUNCTION IN CIRCUIT: | ||||||||||||||||||||||||||||
COMPONENT C: | ||||||||||||||||||||||||||||
FUNCTION IN CIRCUIT: | ||||||||||||||||||||||||||||
Ring the names of two components that work together to produce the flashing of the LEDs. |
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The Printed Circuit Board (PCB) for the dual transistor, multivibrator circuit is shown below. All the components and their position on the PCB can be seen. The garage owners have decided to manufacture a small moulded case for the circuit to fit inside. The LEDs and the switch must protrude through the moulded box so that they can be seen. |
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Name a suitable material for producing the moulded case. |
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Name a suitable manufacturing process for producing the moulded case. | ||||||||||||||||||||||||||||
Sketch a suitable design for the moulded case, include detailed notes. | ||||||||||||||||||||||||||||
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Using the boxes below, draw a sketch in each that represents a stage of manufacturing the moulded case, using the process you have named. You do not need to use all the boxes below. |
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