RF modulator composed of TA7673

RF modulators are essential components for televisions, video recorders, satellite receivers, format converters, home computers and game consoles. This circuit is simple and easy to manufacture, has stable performance and reliable operation, and can be easily connected to various circuit boards and used in various electronic devices mentioned above. As shown in the figure is the specific circuit of the RF modulator. ICl is the modulator ASIC TA7673. Its pins 10 and 11 generate image carrier frequency signals through an external crystal oscillator. Pins 4 and 5 are connected to an external LC oscillation circuit to generate a 6.5MHz second audio signal. The audio signal is input from pin 6 of ICl, and the video signal is input from pin 16 of ICl. When crystal oscillators of different operating frequencies are connected between pins 10 and 11 of IC1, this circuit can be connected between pins 2 and 15 of ICl. Output image carrier frequency signals of channels 1 to 5. No debugging is required after the circuit is installed, but the entire circuit should be shielded with a small metal box.