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Ramsey Electronics Laser Beam Communicator Manual

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LASER BEAM
COMMUNICATOR
Ramsey Electronics Model No.
Have you ever wanted to communicate in a new and interesting
way? Forget stringing wires and tin cans between your house
and your neighbor's! Now you can send messages on a beam
of light! Pretend you're on one of those space adventure shows
we've all watched on TV. Laser beam communication for the
new millenium!
•
Uses a standard pen-laser diode to transmit voice and sound over
several hundred feet through the air, and several miles with good
optical fiber.
•
Uses a pulse-width modulator running at 20kHz for good audio
reproduction.
•
Built-in AGC for sensitivity to low level sounds and good
transmission of high level sounds without distortion.
•
Pen laser included! Use even better laser modules for farther
transmission.
•
A lot of fun to transmit to your friend's house through the window!
•
Powered by any 9 - 12 VDC source.
•
Complete and informative instructions guide you to a kit that works
the first time, every time.
LBC6K

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Summary of Contents for Ramsey Electronics Laser Beam Communicator

  • Page 1 LASER BEAM COMMUNICATOR Ramsey Electronics Model No. LBC6K Have you ever wanted to communicate in a new and interesting way? Forget stringing wires and tin cans between your house and your neighbor’s! Now you can send messages on a beam of light! Pretend you’re on one of those space adventure shows...
  • Page 2 2002 by Ramsey Electronics, Inc. 590 Fishers Station Drive, Victor, New York 14564. All rights reserved. No portion of this publication may be copied or duplicated without the written permission of Ramsey Electronics, Inc. Printed in the United States of America.

  • Page 3: Table Of Contents

    Ramsey Publication No. LBC6K Manual Price Only $5.00 KIT ASSEMBLY AND INSTRUCTION MANUAL FOR LASER BEAM COMMUNICATOR KIT TABLE OF CONTENTS Introduction ..........4 Parts Layout Diagram ......9 Parts List ..........10 Assembly Instructions ......12 Using the LB6K ........18 Troubleshooting ........20 Receiver Board Schematic ....23 Transmitter Board Schematic ....24 Ramsey Kit Warranty ......27 LBC6K •...

  • Page 4: Introduction

    INTRODUCTION You and your friend have a pair of radios you use to talk to each other, but did you notice that sometimes people listen in when you don’t want them to? How can you have a conversation that nobody can listen to but you and your friend? Well you could encrypt the audio of the radio and decode it, but that is an expensive option, and if someone has a decoder they can listen too.
  • Page 5 PWM signal which has an encoded signal in it. The bottom signal is the decoded PWM of the middle PWM signal. Note how when there is a lot of on time (high) on the PWM signal, the resulting decoded signal is higher, and when there is a lot of off time (low) the signal is lower.
  • Page 6 for you, and also digitizes the incoming audio from the microphone with an internal analog to digital converter and converts it to our 18kHz PWM signal. Before we convert the audio from the microphone however, we have to first boost the microphone’s small output of only a few milivolts up to a usable level of a few volts.
  • Page 7 and 17 are all in parallel, making U1:B have a gain of (Av = 1+ 5.6k/100k) or 17.6. When all three pins are off, only R17 is in circuit making the gain (Av = 1 + 100K/100K) or 2. This gives a decent range of amplification for small to large signals, and is controlled by the microcontroller.
  • Page 8 For each part, our word "Install" always means these steps: 1. Pick the correct part value to start with. 2. Insert it into the correct PC board location. 3. Orient it correctly, follow the PC board drawing and the written directions for all parts - especially when there's a right way and a wrong way to solder it in.

  • Page 9: Parts Layout Diagram

    LBC6K PARTS LAYOUT DIAGRAM LBC6K • 9...

  • Page 10: Parts List

    LBC6K PARTS LIST Sort and “check off” the components in the boxes provided. We do our best to pack all our kits correctly but it is possible that we missed a part. Please note that physical descriptions of parts are for those currently being shipped. Sometimes the parts in your kit may have a different appearance but still have the same values.
  • Page 11 LM386 audio power amplifier (U2) LMC660AIN quad rail-to-rail opamp (U1) MISCELLANEOUS 2.1mm DC power jack (J4) 3.5mm stereo jack (J1) 9 volt battery snap TRANSMITTER BOARD PARTS LIST RESISTORS 330 ohm resistor [orange-orange-brown] (R14) 1K ohm resistor [brown-black-red] (R22) 4.7K ohm resistors [yellow-violet-red] (R4,R5) 10K ohm resistors [brown-black-orange] (R18,R23) 22K ohm resistor [red-red-orange] (R19) 1 39K ohm resistor [orange-white-orange] (R3)
  • Page 12 LM660AIN quad rail-to-rail opamp (U1) MC68HRC908JK1CP programmed chip (U3) MISCELLANEOUS 25 MHz crystal [silver can marked 25.0000] (X1) Laser pointer (D3) Microphone (MC1) DPDT pushbutton switch (S1) 2 pin header (J1) 3 pin headers (H1,H2) jumper blocks for H1 and H2 2.1mm DC power jack (J4) 9 volt battery snap cable ties...
  • Page 13 they don’t blow up! The PC board silkscreen will have a “+” marked on it to indicate the positive lead of the capacitor. The cap is marked with a line or stripe down one side which indicates the negative lead, which is also shorter.
  • Page 14 30. Install C11, the huge 3300µF electrolytic capacitor. You definitely want to get the polarity right on this one because it would be a big bang if you blew it up! Unlike the other electrolytics this part is too high when standing up so we’re going to lay the part over on its side before soldering it in place.
  • Page 15 That completes the assembly of the Receiver board. This is a good time to look over your work and check for good, solid solder connections, make sure there are no unwanted solder bridges, and see that the electrolytic caps, voltage regulator and ICs are installed properly. When you’re done looking this half over we’ll move on to the Transmitter board assembly.
  • Page 16 57. Install R24, a 47K ohm resistor [yellow-violet-orange]. 58. Install R19, a 22K ohm resistor [red-red-orange]. 59. Install R18, a 10K ohm resistor [brown-black-orange]. 60. Install R17, 100K ohms [brown-black-yellow]. 61. Install C18, 56pF disc capacitor [marked 56]. 62. Install C9, 560pF disc capacitor [marked 561]. 63.
  • Page 17 81. Install R6, 100K ohm resistors [brown-black-yellow]. 82. Install C8, a 390pF disc capacitor [marked 390K or 391]. 83. Install C13, .1 µF disc capacitor [marked .1 or 104 or 100 nF]. 84. Install R25, a 1M ohm resistor [brown-black-green]. 85.
  • Page 18 note the power button on the side of the laser pointer. You’re going to cause this to be “on” permanently by taking one of the cable ties and wrapping it tightly around the laser pointer so that it depresses the button. Once you’re sure it’s tight and the button is pushed down at all times, clip off the excess plastic from the cable tie to neaten things up.
  • Page 19 Using the LBC6K You will need besides the receiver and transmitter: Headphones or speaker. Any standard headphones will do. Two 9V batteries or wall adapters; one for each receiver and transmitter. You will need some method to hold the receiver and transmitter steady. It is fairly critical that you have good alignment because the focus is pretty tight in the IR transistor, and a little bit off can mean all the difference between sound and no sound.

  • Page 20: Troubleshooting

    Header positions: Jumper block: pins 1 and 2 Jumper block: pins 2 and 3 Audio source: Line level input Audio source: microphone on J1 Test tone Normal operation LBC6K Troubleshooting Guide: Receiver PROBLEM: I don’t hear anything! SOLUTION: Of course many different things can cause this. First check the obvious things like parts placement and assembly.
  • Page 21 PROBLEM: How do I tell if this thing is working correctly? SOLUTION: Well, if it works with the receiver, it is a good indication of proper operation. ;-). Another is the DATA LED or the laser should not turn on unless U3 is operational.
  • Page 22 “user friendly” format that is possible. As our customers, we value your opinions, comments, and additions that you would like to see in future publications. Please submit comments or ideas to: Ramsey Electronics Inc. Attn. Hobby Kit Department 590 Fishers Station Drive...
  • Page 23 LBC6K • 23...

  • Page 24: Transmitter Board Schematic

    LBC6K TRANSMITTER BOARD SCHEMATIC DIAGRAM LBC6K • 24...
  • Page 25 The next two pages left intentionally blank because the author couldn’t think of any funny stories to add here. If you come up with something, write or email and I’ll consider it for the manual! Who could ask for more? You could tell your friends that you’ve been published! See the contact info on page 22.
  • Page 26 LBC6K • 26...

  • Page 27: Ramsey Kit Warranty

    '1K ohm' resistors are actually the 'missing' 10 K parts ("Hum-m-m, I guess the 'red' band really does look orange!") Ramsey Electronics project kits are packed with pride in the USA. If you believe we packed an incorrect part or omitted a part clearly indicated in your assembly manual as supplied with the basic kit by Ramsey, please write or call us with information on the part you need and proof of kit purchase.

  • Page 28: Receiver Board Schematic

    Quick Reference Page Guide Introduction ..........4 Parts Layout Diagram ......9 Parts List ..........10 Troubleshooting ........20 Receiver Board Schematic ....23 Transmitter Board Schematic ....24 Ramsey Kit Warranty ......27 REQUIRED TOOLS • Soldering Iron Ramsey WLC100 • Thin Rosin Core Solder Ramsey RTS12 TOTAL SOLDER POINTS •...