Subsystem: P2 |
Task
Title:
Seeing in the Dark |
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Darlington
Pair
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Introduction and Aims
This
is a very useful and common system that automatically turns on a light
when it gets dark. We will use a Darlington pair (instead of a single
BC548B (BC108C) transistor), to control an output device - an L.E.D. in
our circuit. Subsystem Circuit and Block Diagram
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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