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Posted on Feb 7, 2013

The simple circuit in Figure 1 latches on an LED and an audio sounder when an appropriate new audible e-mail signal occurs. The method replaces the normal e-mail sound.wav file with a .wav file of any valid recorded dual-tone multifrequency (DTMF) sound. The circuit listens for the DTMF tone and latches on LED D1 and the piezoelectric buzzer, P1.



The circuit listens for the DTMF tone and latches on LED D1 and the piezoelectric buzzer, P1. R1 biases the microphone`s FET, and C1 couples the audio to the M-8870 DTMF-receiver, IC1 (Teltone Corp, www.teltone.com). IC1 integrates both bandsplit-fil




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