Showing posts with label decoder. Show all posts
Showing posts with label decoder. Show all posts
Friday, August 2, 2013
Frequency Tone Decoder Circuit Using TC9400 FVC
Another application of FVC (frequency-to-voltage converter) is tone/frequency decoder. This circuit is used to determine the frequency band of an oscillation signal. This circuit is used in many application like determines the frequency band in the signal and remote control where the frequency band corresponds to a different command. This circuit uses TC9400 F/V converter to convert the frequency to voltage because the frequency must be converted to proportional analog voltage before can be detected. This is the figure of the circuit;
Beside TC9400 F/V converter, this circuit also uses the quad comparators. It used to detect when the frequency limits is exceeded by the voltage (frequency). The frequency is indicated by the logical “1″ at any of the five output. [Circuit diagram source: Microchip Application Note]
Sunday, April 7, 2013
DTMF Decoder Circuit For PC
This is a design circuit for decoder circuit that can be use for DTMF circuit for PC. This is the figure of the circuit;
Our DTMF decoder can be powered from a 9V battery or from your parallel printer port. It can detect and display all 16 DTMF digits on your computer screen in real-time. The Windows program can be placed in the minimize mode and still detect tones while you use your computer to do other things like We are now in the process of adding an DTMF decoder which will interface to the sound card game port.
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