Elenco Electronics AK-710 Assembly And Instruction Manual
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Elenco Electronics AK-710 Assembly And Instruction Manual

Elenco Electronics AK-710 Assembly And Instruction Manual

Fm wireless microphone kit
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FM WIRELESS MICROPHONE KIT
MODEL K-30/AK-710
Assembly and Instruction Manual
Elenco
®
Electronics, Inc.
Copyright © 2006, 1994 by Elenco
®
Electronics, Inc. All rights reserved.
Revised 2006
REV-J
753016
No part of this book shall be reproduced by any means; electronic, photocopying, or otherwise without written permission from the publisher.

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Summary of Contents for Elenco Electronics AK-710

  • Page 1 FM WIRELESS MICROPHONE KIT MODEL K-30/AK-710 Assembly and Instruction Manual Elenco ® Electronics, Inc. Copyright © 2006, 1994 by Elenco ® Electronics, Inc. All rights reserved. Revised 2006 REV-J 753016 No part of this book shall be reproduced by any means; electronic, photocopying, or otherwise without written permission from the publisher.

  • Page 2: Parts List

    PARTS LIST If you are a student, and any parts are missing or damaged, please see instructor or bookstore. If you purchased this kit from a distributor, catalog, etc., please contact Elenco back of this manual) for additional assistance, if needed. DO NOT contact your place of purchase as they will not be able to help you.
  • Page 3 The value is 10 x 1,000 = 10,000pF or .01µF 100V FM MICROPHONE KIT Your FM Microphone is really a miniature frequency modulated transmitter operating in the standard FM broadcast band. The range of frequencies for the FM broadcast band is 90MHz (MHz = Megahertz or 90 million cycles per second).
  • Page 4 BASIC MODULATION THEORY There are many different methods for modulating information onto a radio wave. popular methods are Amplitude Modulation (AM) and Frequency Modulation (FM). Figure 1 shows the basic difference between these two methods. In an amplitude modulated radio wave, the audio information (voice) varies the amplitude of the RF carrier.

  • Page 5: Circuit Operation

    CIRCUIT OPERATION Figure 5 shows a block diagram of the FM wireless microphone circuit. The microphone element in Block 1 acts like a resistor that changes when exposed to sound waves. The change in resistance causes current through the microphone element to change when sound waves apply pressure to its surface.
  • Page 6 CONSTRUCTION Introduction The most important factor in assembling your FM Wireless Microphone is good soldering techniques. Using the proper soldering iron is of prime importance. recommended. The tip of the iron must be kept clean at all times and well tinned. Safety Procedures •...
  • Page 7 ASSEMBLE COMPONENTS TO THE PC BOARD C4 - 10pF Discap (10) Q2 - 2N3904 Transistor (see Figure A) L1 - Coil C5 - 12pF Discap (12) C6 - 33pF Discap (33) R8 - 1kΩ 5% 1/4W Res.* (brown-black-red-gold) C7 - .001µF Discap (102) R10 - 1kΩ...
  • Page 8 Mount the slide switch onto the foil side of the PC board. The tabs on the switch must go through the slots of the PC board. Solder the switch to the PC board. Foil Side Insert the free end of the red wire through the slot in the bottom case and solder to the positive (+) clip (see Figure D).

  • Page 9: Final Assembly

    FINAL ASSEMBLY Insert the mic into the slot as shown in Figure F. Insert the LED into the hole as shown in Figure F. Place a piece of tape over the LED to hold it in place. Insert the PC board into the top case, as shown in Figure G.

  • Page 10: Troubleshooting

    OPERATING THE FM MIC After assembling the kit, it will be necessary to tune in the transmitter. First, be sure that all of the parts are in correctly and that you have good solder connections without any solder shorts. Get an FM radio and tune it away from any FM stations.

  • Page 11: Schematic Diagram

    SCHEMATIC DIAGRAM GLOSSARY Amplitude Modulation To modify the amplitude of the carrier wave in accordance with the desired signal, often abbreviated as AM. Amplify To enlarge; increase in scope or volume. Antenna A device by which radio waves are released or received. Audio Sounds that are capable of being heard by the human ear.
  • Page 12 QUIZ 1. The letters FM stand for ___________ ___________. 2. In AM transmissions, the audio information varies the _____________ of the radio frequency carrier wave. 3. In FM transmissions, the audio information varies the _____________ of the radio frequency carrier wave. 4.

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K-30

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