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AM RADIO KIT
MODEL AM-780K
Assembly and Instruction Manual
Elenco
®
Electronics, Inc.
Copyright © 2007, 1999 by Elenco
®
Electronics, Inc. All rights reserved.
Revised 2007
REV-F
753108
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 AM-780K
- Page 1 AM RADIO KIT MODEL AM-780K Assembly and Instruction Manual Elenco ® Electronics, Inc. Copyright © 2007, 1999 by Elenco ® Electronics, Inc. All rights reserved. Revised 2007 REV-F 753108 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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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 mail is at the 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: You Will Need
You Will Need: • 9V Battery • 25 or 30 watt Soldering Iron • Small Phillips and Slotted Screwdrivers IDENTIFYING RESISTOR VALUES Use the following information as a guide in properly identifying the value of resistors. BAND 1 BAND 2 1st Digit 2nd Digit Color... - Page 4 AM (amplitude modulation) broadcast frequencies (550kHz - 1600kHz). Easy- to-build, using only two integral circuits (IC). Assembly of your AM-780K AM Radio Kit will prove to be an exciting project and give you much satisfaction and personal achievement. Care must...
- Page 5 CONSTRUCTION Introduction The most important factor in assembling your AM-780K AM Radio Kit 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.
- Page 6 ASSEMBLE COMPONENTS TO THE PC BOARD Place a check mark in the box provided next to each step to indicate that the step is completed. D1 - 1N4148 Diode D2 - 1N4148 Diode (see Figure A) R4 - 150Ω 5% 1/4W Res. (brown-green-brown-gold) R2 - 3.3kΩ...
- Page 7 ASSEMBLE COMPONENTS TO THE PC BOARD Tuning Capacitor 3 #3 x 5/32” Screws 1 Knob (Dial) 1 Label (see Figures F and G) Tuning Capacitor Your kit may contain a 3 lead or a 4 lead capacitor. Bend the leads as shown.
- Page 8 INSTALL BATTERY HOLDER AND ANTENNA Bend the leads of the battery holder as shown in Figure H. Fasten the battery holder to the PC board with a 2-56 x 5/16” screw and 2-56 nut. Solder the leads to the PC board pads as shown. Install the antenna coil as shown in Figure I.
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Page 9: Troubleshooting
ALIGNMENT Using a small, slotted screwdriver, adjust the trimmer located on the back of the tuning Turn the power OFF. Put a fresh 9V battery into the battery holder and turn the power ON. Adjust the volume to a comfortable level. Tune the dial (around 1000kHz) until a weak station is heard. - Page 10 3. Make sure that all of the parts are placed in their correct positions. Check if the IC, diode and lytic orientations are correct. 4. Use a 2” wire to short capacitor C2 (see Figure M). Turn the volume control up halfway: a) Short by wire, the speaker terminals several times.
- Page 11 GLOSSARY Automatic Gain Control. Audio Frequency Amplitude Modulation Amplifier Converts input signal to output. Anode The positive terminal of a diode. Antenna Any device that either radiates a signal or pulls in a signal. Baffle Used to ensure positive airflow. Capacitor An electronic component that has ability to store a charge...
- Page 12 Elenco ® Electronics, Inc. 150 Carpenter Avenue Wheeling, IL 60090 (847) 541-3800 Web site: www.elenco.com e-mail: elenco@elenco.com...