SIMPLE_TOUCHTONESUPTM_SUP_GENERATOR

Published:2009/7/7 21:29:00 Author:May | From:SeekIC

The oscillator is a Motorola MC14410CP chip using a 1-MHz crystal. The chip generates both the high and low tones, feeding the energy to the amplifier through 1-K resistors and the 1-μF capacitor. Values for the output resistors can vary from a few hundred Ω to about 60 KΩ. The value of the resistor shunting the crystal can vary from about 3 to 15 MΩ. The amplifier consists of an LM-380N.



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