I tried using a phillips DTMF chip to create my DTMF tones but as it was a surface mount chip i had difficulty connecting it without burning the chip. So i have turned to another method, of using the Holtek HT9200A it is the serial version of the chip and is a DIP so should be easier to connect. The only problem is, iam not sure how to programm it (with the picaxe) as its a version of the serial connection iam not used to, the data sheet is http://www.rapidonline.com/netalogue/specs/82-4082e.pdf does anyone have an ideas how to use it? Many thanx
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