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Quadrature sine wave oscillator

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viclick

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sine wave oscillator

Hi folks,

I need to make a circuit for some video experimentation I'm doing. It has to be a crystal controlled 3.58 MHz sine wave oscillator that has quadrature output and is locked to the color burst signal present in an NTSC composite video signal. I know I can probably find such a circuit in a TV but I can't seem to find the circuit I need on the Internet, and I have no access to TV schematics. I have found chips that will do some of what I need (MC44144 for example) but all I have found are very hard to come by or very expensive.

The intention of this work is to create a color video overlay circuit that is genlocked to the incoming composite signal. I have successfully overlayed white text using a PIC microcontroller (see the attached article) and now want to move on to a color application. I'm willing to use discrete components or a chip or chips.

Any ideas will be most welcomed.

Vic
 

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