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DTMF Decoder Using MT8870
Posted on Thursday, May 12, 2011   •   Category: Phone Circuits

DTMF Decoder Using MT8870

This circuit detects the dial tone from a telephone line and decodes the keypad pressed on the remote telephone. The dial tone we heard when we pick up the phone set is call Dual Tone Multi-Frequency, DTMF in short. The name was given because the tone that we heard over the phone is actually make up of two distinct frequency tone, hence the name dual tone. The DTMF tone is a form of one way communication between the dialer and the telephone exchange. A complete communication consist of the tone generator and the tone decoder. In this article, we are use the IC MT8870DE, the main component to decode the input dial tone to 5 digital output. These digital bits can be interface to a computer or microcontroller for further application eg. remote control, phone line transfer operation, LEDs, etc...

     Phone Audio Interface
     Remote control using telephone
     DTMF Phone Decoder
     Telephone Conversation Recorder
     MT8870 DTMF Telephone Dial Tone Decoder
     Telephone Receiver
     Alarm Phone Dialer with MT8880 and PIC 16F84A
     Phone Line Controller
     DTMF Decoder Using MT8870
DTMF Decoder Using MT8870

 

Build Accurate LC Meter and start making your own coils and inductors. This LC Meter allows to measure incredibly small inductances making it perfect tool for making all types of RF coils. LC Meter can measure inductances starting from 10nH - 1000nH, 1uH - 1000uH, 1mH - 100mH and capacitances from 0.1pF up to 900nF. The circuit includes an auto ranging and reset function to make sure the readings are as accurate as possible ... [more]



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