tdaede
commented
2 years ago Hi,
Yes, you can use a plain old 2N7002. The exact one I used is just a particular manufacturer's model that I chose at the time based on availability.
There are two RGB circuits in this repo - one is on td-deflect, and one is in td-rgbinput. The td-deflect one is older and works well, but uses an old stock IC. The td-rgbinput one is functionally similar but built with discrete components.
The td-rgbinput circuit has 4 separate functionalities - a DC restore circuit for AC coupled inputs, a blanking circiut, a gain control circuit, and a bias circuit. You might not need all these parts depending on where you're inserting the signal.
soniccd123
Hello friend,
Great project, looking forward to the next developments, would love to use some of it in one of my TVs someday
I have a question. For the last year and a half i've been working on a Panasonic TC-14RM15L as a test bed for some modifications with the objective of creating a adequate and safe way to add RGB inputs to non European CRT TVs. There are ways to do it in older TVs that have the Jungle IC separated from the TV MCU, but most modern CRTs do not have this configuration.
One area that I'm having trouble is the HBlanking on this set, without correct color signal atenuation, lots of regularly timed transversal lines are visible on the screen. These lines seem to be the beam returning to draw the next line. The problem is that some devices, like the Sega Dreamcast, in specific video modes, will display these lines even with the needed atenuation. Looking at you schematics I supose that I need to pull each color signal low every blank interval and maybe these lines will disapear. I'm excited to try your solution (from what i could understand in the schematics), but I need to know if the 2N7002NXBKR is strictly necessary or one could use more acessible alternatives like the 2N7002L.
Thank you very much, good work!