Subsystem: P3 |
Task
Title:
Timer / Delay |
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Resistor
/ Capacitor
Timer |
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Introduction and Aims
To make a timer circuit that will delay the sounding of a buzzer. It is operated by the press of a switch. The delay time is adjustable from 0 to 45 seconds using capacitors. (Before you start, you will need to quickly research module P6 in the subsystems info link top right). 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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