Subsystem: IP2

Task Title:
Investigating Switches

Switch Triggers
(+ ive going)

 

Introduction and Aims

In this activity we will be using a selection of switches to control an output - a buzzer in this case. Switches are designed to be operated by people in different ways. This makes them suitable for a variety of needs or uses. We will show how this subsystem acts as a "voltage source" and provides a + voltage at its output when the switch is operated. We will find this type of switching useful when we build bigger systems using other process modules.



SubSystem Circuit and Block Diagram

 

IP2
+Going Switch
OP1
Buzzer
 


Investigating the System

First open the "Library of Subsystems" here and read "IP2 Sourcing Inputs". Using the circuit and block diagrams above, complete the following:

1, The switch in the circuit diagram is called a .

2, The component with 10K written next to it is called a fixed

3, The two lines at the top and bottom with + and - on the left hand side are known as .

4, When the switch is operated and the circuit is made, the voltage at the top of the buzzer will be volts. The buzzer is being sourced.

5, When the switch is released and the circuit is opened, the voltage at the top of the buzzer will be volts.

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.

Print this page and by using the circuit diagram above, design the breadboard layout for this system.

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

See IP2 project guide.