Electronics / Modelling in Livewire & PCB Wizard

Automatic Switching:- Light / Temperature Sensing - Transistor Projects.

Automatic Switching: Transistor Project

Aims:

To understand the concept of automatic switching / sensing in electronic circuits

To practice modelling basic electronic switching circuits using the Live Wire and PCB Wizard software

To construct (PCB’s) printed circuit boards

Automatic Switching: Transistor Project You will have an opportunity to:-

Design a temperature/light sensing circuit. To manufacture a printed circuit board.

Two of the circuits respond to a change in light levels and the other two respond to a change in temperature levels. Practically every modern Intel Pentium processor main board features a temperature sensor developed at Delft University of Technology. The sensor detects when the processor starts to become too hot, and switches on a fan to cool it down. As soon as the temperature drops to an acceptable level, the fan is switched off. The temperature sensor was developed by Dr. Anton Bakker, who in April 2000…

Our Learning Intentions

know how to use the Live Wire and PCB Wizard software how to design automatic control circuits understand input sensors and transistor switching an understanding of resistor colour codes using four and five band resistors circuit building skills developed by using the soldering iron practice at following detailed test procedures

Electronics Year 9 Test

Make sketches of a 1K, 2k2, 680R and 470R resistor include the colour code for each

Explain the function of a resistor in an electronic circuit?

Draw the two component symbols necessary and in the correct order to make a potential divider that sounds a buzzer when light shines on the LDR? One of these component symbols have been drawn for you.

4) Explain how the circuit shown below works?

5) Suggest two uses for this type of circuit?

6) What is the trigger voltage for a BS 108 Transistor?

7) Sketch the symbol for a transistor and label the legs: - emitter, collector, base

8) An electronic sensor is required for an elderly persons room that sounds an alarm when the room temperature drops to a certain level or gets ‘too cold’. Draw and complete the circuit diagram using symbols to show the type of sensor required?

9) Name each of the components used in your design?

10) Name each of the component shown below and explain briefly their function when used in an electronic circuit?

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