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LucidScience – Build the PHONE NUMBER DECODER – Page 2 of 7

cm8870 datasheet You can feed a line from the telephone jack to the to decode tones pressed on any dqtasheet on the same cm8870 datasheet, or you can feed the output from some audio source such as an RF scanner, digital recorder or computer sound fm8870 directly into the DTMF decoder. The audio signal is processed by a robust signal processor inside the and any DTMF tones heard will be registered on the data output port.

Basically, and device capable of sending cm8870 datasheet audio signal can be fed into the DTMF decoder, and cm8870 datasheet long as the signal quality is decent, the Ratasheet tones can be decoded. Page 2 of 7.

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Using the DTMF decoder IC and a breadboard, build up the circuit as recommended in the data sheet, which will include a 3. There mc8870 actually five output pins used on the decoder – four of cm8870 datasheet represent the binary data and a 5th pin toggles from low to high and then back cm8870 datasheet low every time a valid DTMF signal has been decoded.

This setup allows a wide range of audio devices to be fed into the input without having to worry cm8870 datasheet impedance matching or the level of the output. This allows your receiving circuit or device to know cm8870 datasheet a number has been repeated.

For testing purposes, it is much easier to feed the signal from your telephone system into the DTMF decoder so you can use the phone keypad to cm8870 datasheet the operation of your circuit. The input is very versatile and can be directly connected to the phone line or to any audio playback device such a computer sound card or cm8870 datasheet recording unit. You could even run an fatasheet microphone into the input and still get a valid DTMF decode by simply placing the speaker from an audio recorder next to the cm8870 datasheet.


Without this data receive pin, you would have no way to know if the same key has been pressed multiple times as the last data on fatasheet 4 bit output will cm8870 datasheet remain the same. Cordless phones and analog cell phones that are not scrambled are particularly cm8870 datasheet as a cheap RF scanner cm8870 datasheet to the DTMF decoder will show the listener every button pressed in real-time. The Cm8870 datasheet decoder really works well on a wide range of devices. So every time a new DTMF tone has been decoded and sent to the 4 bit binary port, the data ready pin will toggle to high for a short time.

datashert For cm8870 datasheet K resistor, a more common value of K or K will work just fine. To get DTMF data into the decoder chip, pins 1, 2, 3, cm8870 datasheet 4 are set up as an analog input as shown in the datasheet example.