TECH1002 Radio Lab Online Report - Duncan and Abi

1. OnlineRadio Lab Report Abigail Mullin and Duncan MacLoed

2. This Report informs and explains the construction and testing of a AM Radio Receiver and an Audio Amplifier. It will discuss: How each was put together. How the different elements work. How successful they were. Introduction

3. Soldering Equipment Printed Circuit Board IC MK484 Transistor BC548B 150pF Variable Tuning Capacitor Ferrite Rod 2.5m of 0.315mm enamelled copper wire Resistors: 100k resistors (brown, black, yellow) x 2 1k resistors (brown, black, red) x 2 270R resistor (red, violet, brown) Ultra-miniature slide switch, 100nF Capacitors x 2 10nF Capacitor Headphone Socket AA Battery Holder AA Battery Head Phones 150mm of electrical wire x 4 (red x 2, black x 2) Radio Receiver Equipment

4. To make the aerial the copper wire was carefully wrapped tightly around the ferrite rod. Then all of the other components were soldered onto the circuit board including resistors, transistor, capacitors, headphone socket and battery attachments. Finally the aerial was soldered into place also. Once the battery was attached it was ready to be switched on and tested. Making the Radio

5. Tuning A radio must have tuning capabilities to receive one specific frequency at a time to pick up the corresponding radio station on transmitting on that frequency. The main components of the tuning circuit are the coil aerial and the tuning capacitor. They work together to make a resonance by alternating the direction that the charge flows through the coil reversing the magnetic field created. The speed that this is done is what sets the frequency and they can both be manually adjusted to change this. Key concepts of How the Radio works Tuning Capacitor Coil Aerial

6. ICTBA 820M Three 1K resistors (R1, R2, R3) (brown, black, red) Two 470R resistors (R4, R6) (yellow, violet, brown). One 1R resistor (R5) (brown, black, gold). Two 330uF (C3, C6) electrolytic capacitors One 150pF (C2) ceramic capacitor. One 100nF (C4) polyester capacitor. One 47nF (C5) polyester capacitor. 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 jack socket. Audio Amplifier Equipment

7. To start making the amplifier we had to start with soldering in the resistors, capacitors, a slide switch, battery snap and stereo jack socket into the circuit board. The next step was to cut the 100mm speaker cable in half and solder in the speaker into the circuit board, which leaves the circuit basically completed. To turn on the amplifier, a battery needed to be plugged in, then the radio needed to be connected to the amp with a plug to plug cable.Once that is done at that's needed is to switch it on, and it worked! Making The Audio Amplifier