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Found 4 results

  1. Hi, I tried some simple composite video mods for my Atari 2600 with terrible results: Blurry image, ghosting, dark image, etc. Then I designed my own mod and it works good enough for me. I wanted to share it with all who want to give a try. First you need to remove some components from the board. I prefer to remove all unused components and store them. But if you are more conservative then remove the following components only Also, you need to remove or disconnect the "RF Modulator Module" and built the Video Amplifier. I designed two simple video amplifiers: The first is a simple one stage amplifier. This circuit Works good but due to the limited gain of only one amplification stage, there is some limitation in the brightness of the image. Most people will not notice it, but I wanted to ensure the best quality possible keeping it simple. The second is a two stage amplifier. This is still a very simple circuit with flat gain up to 4.2MHz (Composite video band width) which ensures brightness and color preservation with minimun distortion. Use the 5K trimmer to adjust the gain (brigthness) of the signal. Teorically you will have 0dB or unity gain with 1577Ohm. This is the Bode plot of my LTSpice simulation of the circuit This is the board with the circuit installed And finally this is the results: Video on a CRT TV Video on a LED TV
  2. Hey there everyone. I was just curious is anyone knew if any of the higher quality modern NES clones offered support for the NES Zapper light gun and composite video out? I know the seemingly most popular option, the AVS from retroUSB, only does HDMI out so there's definitely no light gun support there; but are there any other good quality NES clones out there that do offer light gun support? I don't have plans to buy one any time soon, but it would be nice to know what the options are for playing NES light gun games without having to deal with wonky 72-pin connectors on the toaster or jail bars on the NES-101 top loader.
  3. Hi! Guy staying with me found an Intellvision 2609 and some games at the dump, What a rescue! Figure, why not Composite Video Mod it? Well, found this site: wiki.intellivision.us and thought I could use it and remove the rf module, and place the circuit board there. Blank Screen, searching internet and various people have had similar problems removing rf module, and with it in circuit, causes some ghosting. I ain't no professional, but I know enough to be dangerous, and start hacking rf box apart by pulling components off one bit at a time, soldering back on with it disturbed the image. So, things are good, but I screwed up and the image is too bright and washed out. when doing this, do it one part at a time so's one knows what part did the rick or not... :/ Anyway, I created an rf module shunt circuit Intellivision RF Module Shunt Circuit for 2609.pdf I'm not sure what type of zener diode that is, but it's marked B2 5 and a regular diode didn't work on mock up circuit... Also, I included a Filtering Coil, but I don't think it's needed. Also of note, I tried this circuitbut doesn't work :/ (The internet doesn't lie, right?) Also tried that circuit in front of the intellivision wiki one... I also finished a Atari 2600 Composite Video Mod using Ben Hecks Modified or revised circuit... and looked at other circuits and realized that the outputs from these video chips go through a resistor network and feeds into at least one NPN transistor. Maybe the Intellivision Wiki one can be revised or simplified and include a resistor network cutting original traces ... Anyway, TL;DR: I ripped parts out of rf module untill I had this basic circuit. Now got Composite Video with minimal ghosting. Posting results to share with others. Some more shamless pics:
  4. Sparing you all the backstory I'm once again in need of an Atari 7800 system. I'm hoping to find one in very good condition with no chips or cracks and minimal scratching on the chrome bezel. I would prefer a composite video modded system but would settle for a system with regular RF output if the system was in exceptional condition. Price wise I'm pretty flexible and am open to negotiation but I would prefer not to spend more than $120 shipped on a compsite modded system with power supply or about half that for a system with RF output. Again though I am open to negotiation based on the condition of the system being offered. Thanks for taking the time to view my ad and feel free to shoot me a PM if you happen to have a system that you think I might be interested in.
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