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DTMF calling?

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saran

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i want to know how a dtmf code(dtmf generated code) is transmitted to dial a telephone number, or how a call is made with dtmf code is on the output pin , kindly help me
thank u
 
Checkout the Holtek 9200B. I use it quite a bit and it works great in transmitting and generating DTMF. HTH :)

**broken link removed**
 
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