RF Modulator Circuit Composed of TA7673

Published:2011/4/23 22:46:00 Author:TaoXi | Keyword: RF Modulator | From:SeekIC

The RF modulator is the very important component in TV, VCR, satellite receiver, format converter, home computer and game machine. This circuit is simple, stable and easy to make, it can be easily connected with a lot kinds of circuit boards. The figure is the circuit of RF modulator, ICl is the modulator ASIC (TA7673), the 10-pin and 11-pin generate the image-carrier-frequency signal by external crystal oscillator, 4-pin and 5-pin generate the 6.5MHz second sound signal by external LC oscillation circuit. The ICl 6-pin bring in audio signal, and the ICl 16-pin bring in video signal, when the crystals with different operating frequency access to the IC1 (between 10-pin and 11-pin), this circuit will send out 1 to 5 channel's image-carrier-frequency signal between 2-pin and 15-pin. There is no need to debug the circuit, but the entire circuit should be shielded by a small metal box.



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