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Subject: dtmf dialer

Date: 09/07/02 at 10:02 PM
Posted by: rupesh acharya
E-mail: rupeshacharya@hotmail.com
Message Posted:

I'm using Atmel at89c51 microcontroller to supply numbers to dial through a dtmf dialer UM91215A. The dialer dials when i use it to dial to the extention of the PBX. But when I use it to dial to a number through the exchange of our telecom operator, the dtmf IC produce the tone but it is not able to cut the dial tone.How can I solve this problem
I 'm using BC 547 transistor at the tone output of the dialer.

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