DTMF Decoder using 8870 Projects For Final Year Engineering Students

This circuit can be used to Decode DTMF Tones into 4 Bit BCD output in the form of Digital signals or 4 LEDs, so that one can connect 4 Optocouplers and drive any desired output like Relay.
This DTMF Decoder can be a great communication channel for Antenna Rotator Project. Using just 2 wires, one can communicate 10 Bit data / 4 Bit BCD Data.
This circuit can also be used for various 2 Wire Data Communication applications like multiple load control, Antenna Rotator, Antenna Selector etc., where 10 Bit data can be communicated using just 2 wires over long distance.

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