FOUR_NUMBER_CALLER

Published:2009/7/14 21:26:00 Author:May | From:SeekIC

Motorola MC14410 CMOS Touch-Tone generator chip forms basis for automatic dialer using BCD thumbwheel switch to choose telephone number desired.Numbers are stored in 256-bit PR0M by conventional programming. Article shows how auto patch access and disconnect switches are added. To make telephone call from car through repeater, select number desired, push access button and, when dial tone is heard, push start button to transmit tones corresponding to de-sired number. Article covers circuit operation, programming, and coding, and gives additional circuit using 512-bit PR0M to provide eight telephone numbers.-W. J. Hosking, Drive More Safely with a Mobile Dialer, 73 Magazine, Feb. 1977, p 102-104.



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