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sound generation using ATMEGA microcontrollers

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kumarkummi

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Hi

I need to generate some beep sounds through micro controller with out using an external audio IC,and it is possible to connect the mobile phone head set pins( M+,GND)directly to micro controller to ear that sound,i want to give some feed back through mobile phone.please help me how to do this.
 
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The beep sound is possible with a piezo buzzer which needs only transistorized circuit.
 
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