This document provides instructions for building an AM radio receiver and transmitter circuit, as well as an audio amplifier circuit. It describes the components needed, including a ferrite rod, copper wire, capacitors, resistors, transistors, ICs, and a circuit board. It outlines the steps to assemble the receiver circuit, attach the aerial, batteries, and headphones. It also describes setting up a demonstration that uses an oscilloscope, function generator and the built radio to visualize AM signal modulation and demodulation.

1. RADIO PRESENTATION BUILDING AN AM RADIO

2. EQUIPMENT FOR AERIAL WIRE FERRITE ROD INSULATING TAPE CARD

3. MAKING THE AERIAL CENTRE A PIECE OF CARD AROUND THE FERRITE ROD WIND THE COPPER WIRE AROUND THE INSULATING TAPE APPROXIMATELY 55 TURNS THE WINDING SHOULD MEASURE 25MM SECURE IT WITH INSULATING TAPE ON BOTH ENDS WITH THE WIRE COMING OUT TO THE SIDES

4. CONSTRUCTION OF RECIEVER CIRCUIT BOARD CIRCUIT BOARD TRACK SIDE OF CIRCUIT BOARD TRANSPARENT VIEW OF CIRCUIT BOARD

5. AERIAL (AERIAL) BUILT FIRST PRIOR TO CIRCUIT CONSTRUCTION HEADPHONES SOCKET (HPHONES) BATTERY SOCKET (BATT) 10nF CAPACITOR (C1) 100nF CAPACITORS (C2,C4) 47uF CAPACITOR (C5) TUNER (C6) EQUIPMENT FOR RECIEVER CIRCUIT BOARD

6. MK484 (IC1) ULTRA MINITURE SLIDE SWITCH (SW1) 100K RESISTORS – BROWN, BLACK, YELLOW (R1,R3) 1K RESISTORS – BROWN, BLACK, RED (R2,R4) 270R RESISTOR – RED, VIOLET, BROWN (R5) TRANSISTOR BC548B (TR1) SOLDERING MACHINE PRINTED CIRCUIT BOARD EQUIPMENT FOR RECIEVER CIRCUIT BOARD

7. RESISTORS

8. BUILDING THE TRANSMISSION CIRCUIT BOARD

9. RECIEVER CIRCUIT BOARD AERIAL HPHONES BATT C6 R1 R2 R4 R3 C1 C2 C5 R5 TR1 SW1 IC1 C4

10. SOLDER THE RESISTORS IN PLACE SOLDER THE SMALLER CAPACITORS IN PLACE SOLDER THE BC548B INTO THE CIRCUIT SOLDER THE MK484 RADIO IC IN PLACE SOLDER THE VARIABLE TUNING CAPACITOR INTO POSITION CONSTRUCTION OF RECIEVER CIRCUIT BOARD

11. ATTACH THE CONNECTING WIRES TO THE HEADPHONES SOCKET ATTACH THE HEADPHONES SOCKET TO THE CIRCUIT BOARD THEN SOLDER THE WIRES SOLDER THE AERIAL IN PLACE (REMOVE ENAMELLED COATING FROM WIRE FIRST) ATTACH THE AA BATTERY HOLDER TO THE CIRCUIT BOARD THEN SOLDER THE WIRES CONSTRUCTION OF RECIEVER CIRCUIT BOARD

12. SOLDERING

13. CONSTRUCTION OF AUDIO AMPLIFIER CIRCUIT BOARD CIRCUIT BOARD

14. SOLDERING EQUIPMENT SET PRINTED CIRCUIT BOARD IC TBA 820M THREE 1K RESISTORS R1, R2, R3 (BROWN, BLACK, RED) TWO 470R RESISTORS R4, R6 (YELLOW, VOILET, BROWN) ONE 1R RESISTOR R5 (BROWN, BLACK, GOLD) TWO 330uF ELECTROLYTIC CAPACITOR C3, C6 ONE 10uF ELECTROLYTIC CAPACITOR C1 EQUIPMENT FOR AUDIO AMPLIFIER

15. ONE 150pF CERAMIC CAPACITOR C2 ONE 100nF POLYESTER CAPACITOR C4 ONE 47uF POLYESTER CAPACITOR C5 ONE 8 Ohm SPEAKER 100mm OF SPEAKER CABLE ONE SLIDE SWITCH ONE PP3 BATTERY SNAP ONE 3.5mm PLUG TO PLUG CABLE ONE 3.5mm STEREO JACKET SOCKET EQUIPMENT FOR AUDIO AMPLIFIER

16. CONSTRUCTION OF AUDIO AMPLIFIER

17. AUDIO AMPLIFIER CIRCUIT BOARD BATT SPEAKER C1 R6 R4 R3 R1 R2 C2 R5 LED C6 C3 SLIDE SWITCH C4 C5 STEREO JACKET SOCKET IC TBA 820M

18. SOLDER THE RESISTORS IN PLACE SOLDER THE SMALL CAPACITORS IN PLACE SOLDER THE ELECTROLYTIC CAPACITORS INTO POSITION SOLDER THE LED IN POSITION SOLDER THE IC SOCKET INTO POSITION SOLDER THE REMAINING EXTERNAL COMPONENTS IN PLACE PLACE THE TBA820M IN THE IC SOCKET ATTACH THE BATTERY AND TEST THE CIRCUIT CONSTRUCTION OF AUDIO AMPLIFIER

19. AM TRANSMISSION DEMO

20. OSCILLOSCOPE FUNCTION GENERATOR WIRE AERIAL AM RADIO RECEIVER EQUIPMENT USED FOR THE AM TRANSMISSION DEMO

21. DEMONSTRATION ALL SYSTEMS CONNECTED AND RESULTS OBTAINED TWO RADIO STATIONS RECEIVED POSITIVE AMPLICATION OF THE RECEIVED SOUND WITHOUT DISTORTION

22. RESULTS OF THE DEMO INSTEAD OF JUST HEARING ABOUT THE PROCESS OF DEMODULATION THIS PROCESS GAVE THE GROUP OPPORTUNITY TO VISUALIZE MODULATION AND DEMODULATION THIS WAS VERY USEFUL IN CONCRETING THE KNOWLEDGE FOR THE GROUP ABOUT HOW THE PROCESS WORKS

23. RADIO LAB VIDEOS VIDEOS OF DIFFERENT CONSTRUCTION PROCESSES ARE BELOW http://www.youtube.com/watch?v=mJR2SIHKsnI http://www.youtube.com/watch?v=M_wBGiHm5Qs http://www.youtube.com/watch?v=oD8dtW3rCvM

24. REFERENCES http://www.youtube.com/watch?v=8IXRK5f747E http://www.youtube.com/watch?v=MbSCaeJ08WQ STUDIES IN MEDIA TECHNOLOGY NOTES AND DIAGRAMS CIRCUIT CONSTRUCTION FOR AM RADIO CIRCUIT CONSTRUCTION FOR AUDIO AMPLIFIER AM TRANSMISSION DEMONSTRATION POWERPOINT PRESENTATION BY THREE NON BLONDES UNIVERSALL CHALLENGED