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About simon.plata

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    Space Invader
  1. Hi and thanks to everybody who tryed this mod. May be I forgot to suggest to adjust the trimmer until you obtain the better picture in your set-up. The calculated value is for 0dB gain and 1Vpp output which is the standar composite video signal span. However due to the tolerance of the components in the VCS board and the in the mod, it could be lower or higher than that. The trimmer was included to correct that deviation. Best regards and enjoy!
  2. Hi stlouisrod, have you tried to reduce the gain of the amplifier? Gosthing could be produced by several factors, including unmatched impedance and overdriven signal. The RCA cable could increase the impedance and generate gosthing. I tested it on different LED TV and I have got nice video image. Best regards,
  3. By the way, the link to the mod is lacking tha "a" at the begining so is not working. Here is the correct link: http://atariage.com/forums/topic/271678-simple-diy-composite-video-mod Enjoy
  4. Hi mogul345, thank you for posting my mod in your list!!! Just one coment: my mod comes in one and two transistors versions. However two transistors version is better. Also I posted the PCBs if someone want to fabricate it. I wanted to fabricate a lot and have them available but due to my work I couln't ship them quickly. I have the Eagle files and would be fantastic if someone could fabricate a lot and sell them online. Best regards,
  5. Despite the mod is just a simple video amplifier, it exists several reasons to not work properly: One of them could be amplifier saturation to any or both rails. The real problem can't be found easily without an schematic or a signal analysis with an oscilloscope. The alternative is to revert the mod you did and try with the mod proposed in this tread which is proven and has worked for several people including myself. Best regards,
  6. The mod you're installing is not the same as the one stage (one transistor) posted in this tread. From the information you send it's very difficult and time consuming to reconstruct the schematic in order to analyze the circuit and verify the configuration. However it looks like a bandwidth issue or a unwanted low pass filtering. This could happen because: * The 2N3904 transistor is out of specs or in the lower limit for gain. I suggest to test it for a minimum gain of 200 or replace it. * May some of the minimum removal components are still in place. These components needs to be removed from the VCS board, otherwise they Will attenuate or filter the signal to unusable levels for this mod. If neither of the above Works for you, I suggest to implement the mod posted in this tread, then we can offer better support or advice. Bests,
  7. Hi, Can you share the schematic and component values you're using? I Will give a look and see if I found something. Looks like a bandwidth problem, it could make a color shift or distortion. Best regards,
  8. Hi, it was designed for NTSC bandwidth in mind which is a bit lower tan PAL. However "boggis the cat" used it on a PAL 2600A and worked fine (please see entry #11 above). That means it supported the PAL bandwidth. It should work on a sixer. Only needs to identify the components needed to be removed and the corresponding connection points. The two stage transistor design worked very well for me over all other single stage that I tested before.
  9. Hi, Please see the PDF files attached. Sorry for the delay. VideoAmp2S_MSK.pdf VideoAmp2S_SLK.pdf Best regards,
  10. Hi Darryl, Good to hear you will give it a try. Please let us know if it works for you. Regards, Simon
  11. Hi, Give a quick look to my post: http://atariage.com/forums/topic/271678-simple-diy-composite-video-mod/ May be you like it. Regards,
  12. Hi norm, I'm very glad it worked for you! Thank you very much for your kind comments. I'm happy making a little contribution for the 2600 community! Best regards, Simon
  13. Hi, I did this fix using a thin piece of metal sheet from a food can. Thin metal sheet is easy to cut with scisors or a dremel and a cutting disk. Not a CX40 but may give you some ideas. I did this fix several months ago and the joystick still working like a champ. The donor:
  14. Hi, I posted a simple video mod I did on my Vader/4-switcher board. May it could work for you. Simple and cheap: http://atariage.com/forums/topic/271678-simple-diy-composite-video-mod/
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