Subsystem: P7 |
Task
Title:
Variable Tone Generator |
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555
Timer
Astable/Clock |
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Introduction and Aims
Using a 555 Timer I.C., connected as an Astable (P7), we will create a variety of output sounding tones. We will vary the pitch by adjusting either the variable resistor (Rb) or the capacitor (C). The tones are produced because the 555 integrated circuit can produce an output square wave by repeatedly switching its output signal on and off very quickly. 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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