TT7 • 1 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 l

TT7 • 10 any other place that you hear these tones. Since there are so many uses and possibilities for the TT7, we cannot provide connecting hardwar

TT7 • 11 Using the Ramsey TS1 as a digital latch The Ramsey TS1 touch switch circuit can be used as a set of two digital latches in just a few shor

TT7 • 12 Touch tone reference information The table below has been provided to show you the sixteen different touch tone combinations, and the speci

TT7 • 13

TT7 • 14 TT7 Parts Layout Diagram

TT7 • 15 The Ramsey Kit Warranty Please read carefully BEFORE calling or writing in about your kit. Most problems can be solved without contacting t

TT7 • 16 TT7 TOUCH TONE DECODER Quick Reference Page Guide Introduction to the TT7 ... 4 How it works ...

TT7 • 2 PARTIAL LIST OF AVAILABLE KITS RAMSEY TRANSMITTER KITS • FM10A FM Stereo Transmitter • FM100B Synthesized FM Stereo Tra

TT7 • 3 TT7 TOUCH-TONE DECODER Ramsey Publication No. MTT7 Price $5.00 TABLE OF CONTENTS Introduction to the TT7 ... 4 How it works ...

TT7 • 4 Welcome to the TT7 Touch-Tone Decoder Thank you for purchasing the TT7 Touch Tone Decoder. Your kit has been designed to be dependable, use

TT7 • 5 RAMSEY TT7 Touch-Tone Decoder Parts List SEMICONDUCTORS ❒ 1 145436 touch tone decoder chip (U1) ❒ 1 74LS154 demultiplexer [24 pin

TT7 • 6 • Use a 25 Watt soldering pencil with a clean, sharp tip. • Use only rosin core solder intended for electronics use. • Use bright lighting.

TT7 • 7 side. Be sure that the (-) goes in the (-) hole on the PC, and the (+) in the (+) side! C1 filters any noise in the power input so that the

TT7 • 8 Setup and testing In order to successfully operate your TT7, you need a 5 volt power supply. This is a common voltage for most digital circ

TT7 • 9 ❒ 4. Using one of the two circuits to generate DTMF tones, (press the buttons!) test each output point while you generate the corresponding