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av:5200_s-video_mod [2019/08/27 20:45] (current)
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 +==== Atari 5200 S-video and Audio Mod ====
 +
 +
 +This page is made up from the schematic on the 5200 FAQ with new pictures and explenations.
 +
 +== Luma Decoder Circuit ==
 +
 +The first stage of the Luma circuit decodes the digital luminance signal and mixes in the sync.
 +
 +{{av:​5200_luma_decoder.gif}}
 +
 +== Luma Impedance Matching ==
 +
 +The decoded luma is then passed though a [[http://​hyperphysics.phy-astr.gsu.edu/​hbase/​electronic/​npncc.html#​c3|emitter follower amplifier]] to lower the impedance to the desired level.
 +
 +{{av:​luma_amp_final.gif}}
 +
 +
 +The chroma and audio outputs are strong enough not to need any amplification.
 +
 +{{av:​5200_c_and_a.gif}}
 +
 +
 +== Parts ==
 +
 +  * 100uF Capacitor
 +  * 10uF Capacitor
 +  * 1uF Capacitors (2)
 +  * 10 ohm
 +  * 75 ohm (2)
 +  * 750 ohm
 +  * 1.6 kohm
 +  * 2 kohm
 +  * 4.7 kohm
 +  * 9.1 kohm
 +  * 18  kohm
 +  * 36  kohm
 +  * 1N4148 low power silicon diode (CR1)
 +  * 2N3904 or equivalent transistor
 +  * S-Video Jack
 +  * RCA Jack
 +
 +== Where to get signals ==
 +
 +The Below is quoted directly from the 5200 FAQ
 +
 +FIXME Perhaps someone with a 5200 can take some board pics?
 +
 +Most of the components do not have visible labels on the board'​s
 +silkscreen, so giving component numbers is not useful. ​ In the
 +upper right corner of the area of the board that's covered by the
 +shielding, there is a horizontal row of components.
 +
 +
 +               ​o ​ o  o  o  o  o  o  o  o  o  o  o  ​
 +               ​| ​ |  |  |  |  |  |  |  |  |  |  |  ​
 +               ​C ​ R3 R2 R1 D  R  R  R  R  R  R  R  ​
 +               ​| ​ |  |  |  |  |  |  |  |  |  |  |  ​
 +               ​o ​ o  o  o  o  o  o  o  o  o  o  o
 +                              ^  ^  ^  ^  ^  ^
 +                              |  |  |  |  |  `-Chroma
 +                              |  |  |  |  `----Luma 1
 +                              |  |  |  `-------Sync
 +                              |  |  `----------Luma 0
 +                              |  `-------------Luma 2
 +                              `----------------Luma 3
 +
 +
 +
 +There is a row of components to the right of the GTIA (C014805)
 +and below a cluster of inductors and transistors.
 +
 +
 +                o  o o o o o o o o o o
 +                |  | | | | | | | | | |
 +               R40 R R R R R C R R C C
 +                |  | | | | | | | | | |
 +                o  o o o o o o o o o o
 +                               ^
 +                               ​`--Audio
 +
 +
  
 
 av/5200_s-video_mod.txt ยท Last modified: 2019/08/27 20:45 (external edit)
 
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