Diopter Doctor
RGB mod G3F Chassis
Inject RGB via empty teletext port. I added a 2PDT switch to allow switching between RGB via scart and s-video/composite inputs. You MUST disconnect the Y input to the Jungle chip to avoid getting a double image (see first attempt pictures). I tried everything possible to avoid this (ex. csync only, sending sync through composite and s-video ports, etc.). Blanking is activated by anything over ~0.7V so you need a pretty large resistor (I did 1.5k ohms) to keep from putting too much into your Jungle Chip. If you go over 2k ohms, you get weird static for the first five minutes of gameplay) Lastly, you should change the termination impedance from 100 ohms to 75 ohms. The other pictures on here are actually using the factory 100 ohms and I didn't notice a huge difference after I changed it to 75. The colors just looked a little purer/better contrast, but again, very slightly.
RGB mod G3F Chassis
Inject RGB via empty teletext port. I added a 2PDT switch to allow switching between RGB via scart and s-video/composite inputs. You MUST disconnect the Y input to the Jungle chip to avoid getting a double image (see first attempt pictures). I tried everything possible to avoid this (ex. csync only, sending sync through composite and s-video ports, etc.). Blanking is activated by anything over ~0.7V so you need a pretty large resistor (I did 1.5k ohms) to keep from putting too much into your Jungle Chip. If you go over 2k ohms, you get weird static for the first five minutes of gameplay) Lastly, you should change the termination impedance from 100 ohms to 75 ohms. The other pictures on here are actually using the factory 100 ohms and I didn't notice a huge difference after I changed it to 75. The colors just looked a little purer/better contrast, but again, very slightly.