Subsystem: P5 |
Task
Title:
Keep Cool Fan |
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Transistor
Driver
(Output Buffer) |
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Introduction and Aims Example System: This is a design and make project called "Keeping it Cool". Design Brief: Produce a system that automatically keeps electronic equipment at a safe working temperature. Specification:
When the temperature reaches a critical point, operate a cooling fan which
will remain switched on until the temperature reduces to the required
level. Solution: This automatic cooling fan system will detect a rise in temperature and use P5, an output buffer, to provide us with enough power to run a motor/ fan and sound an alarm. The Input sensor will detect the temperature and control the output/motor via the transistor driver.
Modelling the System/Circuit There are different ways to model and test circuits before components are soldered to a P.C.B.. Modelling is an important stage as it helps you spot any problems and make modifications more easily. Method 1: Breadboard Using this method, components are pushed into the interconnected holes as shown in the diagram below. The lines shown, indicate which holes are internally connected. Method 2: Computer Simulation To begin, ask your supervisor if circuit simulation software is available on your PC. This method allows you to build up your circuits quickly and cheaply in a virtual environment but will not give you hands-on experience of the components you will be using when finally soldering your P.C.B.. Method 3: Using OnTrack modelling hardware
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