Ramsey Electronics TT7 Assembly And Instruction Manual

Ramsey Electronics TT7 Assembly And Instruction Manual

Touch-tone decoder

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TOUCH TONE
DECODER
Ramsey Electronics Model No.
Now you can use touch-tones to control virtually anything via radio,
phone line or even tape. The kit is backed up by powerful 20mA
output lines that can be set up to control nearly anything that you can
think of. And, you are backed up by over 25 years of excellence from
the world's best kit supplier.
Turning on and off lights, radio and TVs in your home are just
some of the almost infinite possibilities!
A state-of-the-art "central office quality" decoder makes the
Touch Tone Decoder extremely reliable and accurate.
It's powerful 20mA driving capability can power relays, digital
devices, LED's and more!
It even decodes the four additional A, B, C and D tones!
You build it in one evening. Why spend big money when you
can say "I built it myself!" for a fraction of the cost.
Clear concise instructions guide you to a finished kit...and then
offer hints and tips on how to hook it up and use it. Ramsey is
right there with you all of the way!
Become one of many satisfied Ramsey customers and be one
of the World's Best Kit Builders!
TT7

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Summary of Contents for Ramsey Electronics TT7

  • Page 1 TOUCH TONE DECODER Ramsey Electronics Model No. Now you can use touch-tones to control virtually anything via radio, phone line or even tape. The kit is backed up by powerful 20mA output lines that can be set up to control nearly anything that you can think of.
  • Page 2: Tt7 Touch Tone Decoder

    Ramsey Electronics publication No. MTT7 Revision 1.2 First printing: April 1994 COPYRIGHT 1994 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.
  • Page 3: Table Of Contents

    Parts list ........5 TT7 Assembly instructions ..6 Setup and testing ..... 8 Troubleshooting ......9 Ideas and uses for the TT7 ..10 Touch-tone frequencies ... 13 Schematic diagram ....13 Parts Layout diagram ....14 TT7 • 3...
  • Page 4: Introduction To The Tt7

    In fact, the TT7 even decodes A, B, C and D tones that are common on many of today’s ham radios.
  • Page 5: Parts List

    RAMSEY TT7 Touch-Tone Decoder Parts List SEMICONDUCTORS 145436 touch tone decoder chip (U1) 74LS154 demultiplexer [24 pin IC](U2) 2N3904 NPN signal transistor [marked 3904](Q1) 1N4002 [black epoxy case with a band](D1) 3.579 MHz crystal CAPACITORS .01uF disc ceramic [marked .01 or 103 or 10nF](C2, 3)
  • Page 6: Tt7 Assembly Instructions

    7. Install C1, 10uF electrolytic capacitor. You will notice that the capacitor has a black stripe on one side. This side also has a shorter leg. This is the (-) side. Normally, PC boards are marked on their (+) TT7 • 6...
  • Page 7 Congratulations! You have just completed your TT7 Touch-Tone Decoder. Take a minute to relax and then come back and check all of the solder connections and parts for correct installation. Any misplaced parts, bridged solder connections or cold solder joints may damage your kit permanently! TT7 •...
  • Page 8: Setup And Testing

    1. Hook the 5 volt power supply to your TT7. To do this, run a wire from the (+) side of your supply to the (+) connection on your kit. This wire is traditionally red, while the (-) wire is traditionally black.
  • Page 9: Troubleshooting

    There are an almost infinite number of uses for the TT7. One suggestion is to hook up the TT7 to various lights in your house. This way, when you are away from home, you can call and turn them on or off. This might be helpful if you do not want to come home to a dark house.
  • Page 10: Ideas And Uses For The Tt7

    TT7 capabilities. Also, if a prank caller, or your best friend were to call and try to operate your TT7, you are at least aware that this has happened, because all of the tones are recorded on your machine.
  • Page 11 TT7 to decode a very fast set of tones. When a tone is heard, the latch will hold the light on until it hears another.
  • Page 12: Touch-Tone Frequencies

    The table below has been provided to show you the sixteen different touch tone combinations, and the specific frequencies required to activate your TT7. In order to create a valid touch tone, two frequencies must be mixed. Looking at the table below you will notice one set of four “low” frequencies, and one set of four “high”...
  • Page 13: Touch-Tone Frequencies

    TT7 • 13...
  • Page 14: Parts Layout Diagram

    TT7 Parts Layout Diagram TT7 • 14...
  • Page 15 '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...
  • Page 16 Parts list ..........5 TT7 Assembly instructions ....6 Setup and testing ......8 Troubleshooting ........ 9 Ideas and uses for the TT7 ....10 Touch-tone frequencies .....12 Schematic diagram ......13 Parts Layout diagram ....... 14 REQUIRED TOOLS •...

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