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MODULAR ELECTRONICS | |
V. Ryan © 2002 - 2017 | |
When building a circuit it is a good idea to treat it as being made up of modules or parts. For example you may want a circuit to be composed of a switch and a bulb. To make it easier to design the circuit it is better if it is treated as two separate parts, a switch circuit and a bulb circuit. These are then joined together - to produce one completed circuit. Circuits are often built as modules with each doing a specific job. For example, a sensor module, a transistor module, a buzzer module etc...... When these are connected together they become a single integrated circuit. |
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Two simple modules are seen opposite and they are
clearly labelled. They can be rearranged to produce a complete circuit.
When the switch is pressed the bulb lights (see below). |
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The modules are linked together by electrical wires
and they fit into the positive or negative connections on the electronic
boards/modules. |
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Below is a temperature sensor circuit. When the temperature falls the resistance of the thermistor falls and a bulb lights. Notice how the modules are put together to form the completed circuit. |
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The temperature sensor is connected to a transistor which is then connected to a bulb. The transistor allows sharp switching of the bulb so that when the temperature falls the bulb comes on immediately and when it rises it goes off just as quickly. Can you draw the circuit as a circuit diagram ? |
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QUESTIONS |
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Below are some modules that can be put together to form completed circuits. Cut them out with a scissors and join them to complete the circuit questions on Sheet 3. If you require any modules that are not on this sheet, design them yourself and add them to the ones below. |
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1. This
question refers to the example ‘temperature sensor circuit’ near the top
of this section. |
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Remember to show your understanding of components such as relays and circuits that include ‘Darlington Pairs’ etc.... The examiner cannot give you marks for your understanding of electronics if you do not show it on paper. |
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