Elenco Electronics AK-710 Assembly And Instruction Manual

Text of Elenco Electronics AK-710 User Guide:

• Elenco Electronics AK-710, FM WIRELESS MICROPHONE KIT MODEL K-30/AK-710 Assembly and Instruction Manual Elenco ® Electronics, Inc. Cop yr ight © 2006, 1994 b y Elenco ® Electronics , Inc. All r ights reser ved. Revised 2006 REV-J 753016 No par t of this book shall be reproduced b y an y means; electronic, photocopying, or otherwise without written permission from the publisher.

• Elenco Electronics AK-710, -1- 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 ® Electronics (address/phone/e-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. RESISTORS Qty. Symbol Value Color Code Part # 1 R5 150Ω 5% 1/4W brown-green-brown-gold 131500 2 R8, R10 1kΩ 5% 1/4W brown-black-red-gold 141000 1 R7 1.5kΩ 5% 1/4W brow

• -2- FM MICROPHONE KIT Your FM Microphone is really a miniature frequency modulated transmitter operating in the standard FM broadcast band. The r ange of frequencies f or the FM broadcast band is 90MHz (MHz = Megahertz or 90 million cycles per second). Because the FM microphone has a variable tuned circuit, it can be tuned to a quiet spot on your local FM broad

• -3- BASIC MODULATION THEORY There are many different methods for modulating information onto a radio wave. The two most 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. To r

• Elenco Electronics AK-710, -4- 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. This action is similar to squeezing a garden hose and watching the water through it decrease. When the hose is released, the water through it will increase. When sound waves hit the microphone element, the electrical current through the eleme

• Elenco Electronics AK-710, Introduction The most important factor in assembling your FM Wireless Microphone is good soldering techniques. Using the proper soldering iron is of prime importance. A small pencil type soldering iron of 25 - 40 watts is recommended. The tip of the iron must be kept clean at all times and well tinned. Safety Procedures • Wear eye protection when soldering. • Locate soldering iron in an area where you do not have to go around it or reach over it. • Do not hold solder in your mouth. Solder contains lead and is a toxi

• Elenco Electronics AK-710, ASSEMBLE COMPONENTS TO THE PC BOARD -6- 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 5% 1/4W Res.* (brown-black-red-gold) R1 - 8.2kΩ 5% 1/4W Res. (gray-red-red-gold) R4 - 47kΩ 5% 1/4W Res. (yellow-violet-orange-gold) R3 - 4.7kΩ 5% 1/4W Res. (yellow-violet-red-gold) C1 - .1µF Discap (104) R2 - 27kΩ 5% 1/4W Res. (red-violet-orange-gold) R6 - 10kΩ 5% 1/4W Res. (brown-black-orange-gold) R5 - 150Ω 5% 1/4W Res.* (brown-green-brown-gold) R9 - 47kΩ 5% 1/4W Res.* (yellow-

• Elenco Electronics AK-710, -7- 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. Strip the insulation off of both ends on t he remaining 2 1/2” of black wire and the 7” of red wire to expose 1/8” of bare wire. M ount and solder the black wire to the foil side of the PC board in hole J4 (–) and the red wire in hole J3 (+). Solder the free end of the black wire to the negative (–) clip. J3 J4 F oil Side of PC Board Insert the free end of the red wire through the slot in the bottom case and solder to the positive (+) clip (see Figure D). Pull the wire back through the slot and insert the clip into the c

• Elenco Electronics AK-710, -8- 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. Insert the negative (–) battery clip into the bottom case as shown in Figure G. Press the gray antenna wire and the 7” piece of red wire through the slots in the top case as shown in Figure G. Place the bottom case onto the top case. Hold t he two halves together with three 2.6 x 8mm screws and one 2.5mm x 4mm sc

• Elenco Electronics AK-710, -9- Tug slightly on all parts to make sure that they are indeed soldered. A solder bridge may occur if you accidently touch an adjacent foil by using too much solder or by dr agging the soldering iron across adjacent foils . Break the bridge with your iron. Make sure that all of the parts are placed in their correct position. Check if the transistors’ orientations are correct. Make sure that the polarity of the LED and microphone are placed in the correct position. FOIL SIDE OF PC BOARD OPERATING THE FM MIC After assembling the kit, it will be necessary to tune in the transmitter. First, be sure that all of the pa

• Elenco Electronics AK-710, SCHEMATIC DIAGRAM -10- 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. Buffer Stage A circuit used to insulate signals from other circuits. Capacitor A device that is capable of holding an electric charge. Capture The capacity of an FM receiver to pick only the strongest sign

• Elenco Electronics AK-710, 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. In a standard FM radio broadcast moving the carrier + 75kHz from the center frequency would represent _____________% modulation. 5. The effect of rejecting the weaker station and accepting only the strong station is called ______________. 6. When the microphone is e

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