Name My end of year 8 Target = Teacher. OLSJ Design & Technology Electronic Products. Overall Progress Effort Rating ABCDEFG.

Transcription

1 Name My end of year 8 Target = Teacher OLSJ Design & Technology Electronic Products Week Lesson Objectives What will you learn about today? 1. Circuit Symbols and circuit diagram 2. Drilling and soldering Push Switch to wire 1. The diode, it s purpose and how to identify it. 2. Resistors, values, colour bands, how to read them. 1. Capacitors Their purpose, types, how to identify 2. Switches Types of switches and their uses in electronic products timer Integrated Circuits Pins/ 2. To learn about soldering I.C Sockets to PCB 1. To learn about how output components switch on and off by a 555 timer 2. To learn about quality assurance in project work 1. To learn about testing a completed circuit 2. To Learn about the Photo Etching method for making a PCB 1. Learn how to use the vacuum forming process to make a case 2. How to assemble a product and add decals 8 1. End of Module Assessment 2. Review Project Plan / How did you do? Overall Progress Effort Rating ABCDEFG Overall Effort A B C D E F G Homework ABCDEFG Organisation A B C D E F G Overall % CWL Awarded

2 4 CBA 5CBA 6CBA

3 Preparing the soldering iron: Place the soldering iron in its stand and plug in. The iron will take a few minutes to reach its operating temperature of about C. Name the 6 items from the tool Cupboard Dampen the sponge in the stand. The best way to do this is to lift it out the stand and hold it under a tap for a moment, then squeeze to remove water. It should be, not dripping wet. Wait a few minutes for the soldering iron to warm up. You can check if it is ready by trying to a little solder on the. Wipe the tip of the iron on the damp sponge. This will clean the tip. Melt a little solder on the tip of the iron. This is called and it will help the to flow from the iron's tip to the. It only needs to be done when you in the iron, and occasionally while soldering if you need to the tip clean on the. Word Bank 400 damp excess melt tinning heat plug Joint Wipe sponge cold tip 4 CBA 5CBA 6CBA

4 Hold the soldering iron like a pen, near the base of the handle. Imagine you are going to write your name! Remember to never touch the hot element or tip. Touch the soldering iron onto the joint to be made. Make sure it touches both the component lead and the track. Hold the tip there for a few seconds and... Feed a little solder onto the joint. It should flow smoothly onto the lead and track to form a volcano shape as shown in the diagram. Apply the solder to the joint, not the iron. The smoke is the acid from the flux inside the solder wire Remove the solder, then the iron, while keeping the joint still. Allow the joint a few seconds to cool before you move the circuit board. If you burn your finger then put it under cold running water immediately Inspect the joint closely. It should look shiny and have a 'volcano' shape. If not, you will need to reheat it and feed in a little more solder. This time ensure that both the lead and track are heated fully before applying solder Component Soldering : How do you hold a soldering iron? How long do you hold the iron onto the joint before you add solder? What shape should the soldered joint be? Where does the smoke come from? What should you wear to protect the smoke from going in your eyes? What do you do if the soldered joint is not the correct shape? What should you do if you burn your finger? Label the diagram 4 CBA 5CBA 6CBA

5 The Diode A diode allows current to flow through it in direction. Current can only flow through it from the to the. A diode prevents any voltage caused by putting the in backwards. Symbol Cathode Anode Silver Band Anode one batteries cathode reverse negative Circuit A Circuit B In which circuit would the bulb light up Circuit A Circuit B Label up the legs on real life picture of the Diode Anode Cathode Summary Questions 1.What is the name of the negative terminal of a diode? 2 Give one characteristic of a diode 3. How can you tell the positive end of a diode? 4.Redraw the real life picture and the circuit symbol for a diode 5. What is a diode used for in an electronic circuit? 4 C B A 5 C B A 6 C B A

6 First band = Brown = 1 Second band = Grey = 8 Third band = Brown = One zero Value of resistor = 180 ohms First band = Brown = 1 Second band = Black = 0 Third band = Green = 6 zeros Value of resistor = 1,0, Million Ohms ( 1M ohms) 4CBA 3 correct / good attempt) 5CBA All Values with symbols 6CBA All values and simplify using prefix ( K, M)

7 4CBA (Good attempt requiring some assistance) 5CBA (Good explanations / largely correct) 6CBA (Clear and confident)

8 Capacitors store charge / voltage. The two types of capacitors you have used in your circuit are the and the Symbol for a polarised or electrolytic capacitor CAPACITORS Electric, electrolytic, non-electric, non-electrolytic Cross-out the wrong answer in the statements below An electrolytic capacitor is also known as a polarised/non-polarised capacitor The long lead (leg) of a polarised capacitor is called the cathode/anode or the positive/negative lead The short lead (leg) of a polarised capacitor is called the cathode/anode or the positive/negative lead For quality assurance purposes, a black sleeve is placed on the cathode/anode and a red sleeve on the anode/cathode. Label the anode and the Real life picture for a cathode on the real life polarised or electrolytic capacitor picture electrolytic capacitor The unit for measuring capacitance is (a) current (b) volts (c) ohms One Farad (1F) = (a) 100 (b) 1 thousand (c) 1 million Symbol for Non-polarised or non-electrolytic capacitor Name three other components you have used in your circuit which are polarised.,, and. What is the difference between the symbol of a polarised and non-polarised capacitor? Redraw the symbols for both a polarised capacitor and a battery. Clearly show the difference between them Battery microfarads (µf) Real Life picture of a Nonpolarised or nonelectrolytic capacitor Polarised capacitor Working Level:- 4A Required significant help to complete; 5B Largely completed following teachers explanation; 6C Confidently completed with good responses

9 Year 8 SWITCHES A switch will either stop or change the direction of current flowing in a circuit. When switches are used to control current flowing in circuits they can be made to make or break a path. Instructions: You are the now the Electronics Engineer! 1. You need to design a circuit that will turn a light on and off in the hallway of a new office building. 2. Build a working circuit with just a battery and a bulb. Draw battery symbol Circuit Design 1. Identify and match the switches with the symbols. (ONE HAS BEEN DONE FOR YOU) Name of switch Symbol of Switch Picture of Switch Description Draw a bulb symbol A B C red black 3. Next, add a switch in such a way that a switch turns can be included to turn the bulb on and off. Draw a Toggle switch symbol Circuit design with switch included D E Single pole single throw toggle switch (SPST switch) Push-to-Break (PTB switch) Single pole double throw micro switch (DPST switch) Double pole double throw toggle switch (DPDT switch) Double pole double throw toggle switch (DPDT switch) Push-to-Make (PTM switch) 4. Name some electronic products that use Push to make switches that could be found at school / home How well did you do? 4 CBA 5CBA 6CBA

10 Year 8 4 CBA 5CBA 6CBA

11 P Year 8 S P H P P T T P B I Label Each part of the diagram above using the correct terms below:- PCB Board, Heads LED, Tails LED, Pin 1, Negative Rail, Timing Components R1, R2, C1, Input Switch, Positive Rail Battery Snap, Strain Holes, Track,Pad, Pin 3 Output N L 4CBA (Good attempt requiring some assistance) 5CBA (Good / largely correct) 6CBA (Clear and confident)

12 Year 8 Output Components- Connecting LED s to the Circuit When the toggle switch is open there is current flowing in the circuit and both LED s will be When the output pin of the 555 timer is then LED is turned When the output pin of the 555 timer is then LED is turned On your circuit board :- LED#1 should be attached to the top / bottom of the PCB LED#2 should be attached to the 555 Astable Flip Flop LED#1 PTM Toggle Switch Wire Wire On your circuit board :- The PTM switch is a P t m. When it is pressed the flashing begins. When it is r then the flashing stops and only one LED will be lit. top / bottom of the PCB LED#2 Battery Clip Battery Clip The toggle switch should be left as a loop to make sure it is always switched on 4CBA (Good attempt requiring some assistance) 5CBA (Good / largely correct) 6CBA (Clear and confident)

13 Year 8 Name of Component 1.. Component Symbol Component Drawing Component Position in Circuit CIRCUIT DIAGRAM Identify and label all the electronic components shown in all columns. (ONE HAS BEEN DONE FOR YOU) PCB Non-Polarised Capacitor. 9.. Battery, Toggle switch, Diode, Resistor, Light Emitting Diode, 555 Integrated Circuit (IC), Polarised Capacitor, Non-Polarised Capacitor, Push-To-Make Switch 4 CBA 5CBA 6CBA

14 Quality Assurance Testing Your Circuit Year Astable Flip Flop LED#1 (top) PTM Toggle Switch Wire TEST #1 100 presses Total LED #1 (top) Colour = LED #2 (bottom) Colour = 4 C B A 5 C B A 6 C B A Battery LED#2 (bottom) Clip Battery Clip Failure Number After X presses Test number 1 2 Pass / Fail

15 Manufacture of Printed Circuit Boards OLSJ Design & Technology Electronic Products PCB Manufacturing Process CBA 5CBA 6CBA

16 PVC mould Year 8 Label up the parts of the case in the correct order Which casing??? Face book Like Dislike Acrylic top fascia Acrylic back Right or Wrong Measure the dimensions of the fascia (Use mm ) Heads or Tails What made you choose the design? Label the Assembly A= LED 1 B= LED2 C= Securing hole D= Push Switch hole What other designs could be used? 4 CBA 5CBA 6CBA

17 CIRCUIT DIAGRAM PRINTED CIRCUIT BOARD (PCB) What is the purpose of a circuit diagram? How can drawing on a computer help to draw circuit diagrams? Explain what the following parts of the PCB are for Pad Tracks Text Was your soldering Poor / Good / Excellent Why? 4 C B A (Good attempt requiring some assistance) 5 C B A (Good / largely correct) 6 C B A (Clear and confident)

18 START Heads or Tails Week Drill Printed Circuit Board Record of Progress X 8 Pupil Feedback Did you complete your project ahead of schedule? Solder the Push to Make switch to wires Populate with components Test Electronics Circuit works Manufacture Casing (vacuum former) Assemble circuit into case Fit the acrylic top and design back Add graphics decals / stickers Final Testing Finish X Which was your favourite part of the project? Which was your least favourite part of the project? How could this project be improved next time? 4 C B A (Good attempt requiring some assistance) 5 C B A (Good attempt / largely correct) 6 C B A (Clear and confident answers )

19 Use the boxes to draw 3 separate views of your finished project. Use a ruler, pencil, colour to improve the quality of your drawing. Label the LED s and the Push switch on one of your drawings 4 C B A (Good attempt requiring some assistance) 5 C B A (Good attempt / largely correct) 6 C B A (Clear and confident answers )

20 Mr Hodgson s Ultimate 555 timer Word search Extension Work Can you find as many words associated with the 555 timer circuit in the grid? The winner will receive my special prize!!!!!

21 Mr Hodgson s 555 Timer Crossword Extension Work

22 Mr Hodgson s 555 Timer Hangman Extension Work Choose words from the 3 columns and play hangman in the box with your neighbouring pupil. First to 5 correct words wins!!!!!!!!!!!

23 Heads or Tails Assessment of Making Name Follow Me Stage Description of Task Soldered across? Features of component Your Comment on soldering/ quality / what you understand Target Week to complete Actual Week Completed? 1 Drill 1mm(x32) and 2mm(x10) 1 2 PUSH TO MAKE SWITCH PTM 1 3 Diode D1 Silver band is Cathode 2 4 Resistor 1K R1K Brown, Black, Red, Gold 2 5 Resistor 10K R10K Brown, Black, Orange, Gold 2 6 Capacitor 10uF C10uF Long (+VE) and short leg (-VE) 3 7 Switch SW1 SW1 Yellow multi core wire (30cm) 3 8 PTM Switch PTM Yellow multi core wire (15cm) 3 9 Capacitor 0.01uF (10nF) C0.01uF Orange circular shape. Legs equal length. 104 written on 10 8 Pin Socket 555 Notch with number 8 to top 4 11 Resistor R180 R180 Brown, Grey, Brown, Gold 4 12 Resistor R180 R180 Brown, Grey, Brown, Gold 4 13 LED #1 LED1 Long leg = red, short leg = black 5 14 LED #2 LED2 Long leg = red, short leg = black 5 15 BATTERY CLIP PWR Stitched through strain holes 5 16 INSERT 555 CHIP Pin 1 has a dimple (top left) 6 17 TESTING Battery press switch to flash 6 18 Assemble in case PVC Mould and acrylic case 7 3