Pasky
Fug:DDDDD,
- Joined
- May 5, 2013
- Posts
- 2,844
So, I was unable to achieve a solid color screen for each individual color. So I got the next best thing which was an all white screen. At pure white, all colors are at their maximum output (255,255,255). So with this in mind I took a scope to the MV-1C using this screen:
So the results are:
Green: 3.80 Vp-p
Red: 3.52~ Vp-p
Blue: 3.52~ Vp-p
Sync: 4.0~ Vp-p
Most other consoles output to a television set at 1.7Vp-p~ (becomes 1/2 with the 75 inline resistor so effectively 0.85 is the result).
So with that in mind, the resistor values to get a 0.85Vp-p for each individual color line (assuming a 75Ω to ground in the tv) is:
Green: 260 Ω
(http://www.wolframalpha.com/input/?i=0.85+=+(75/(75+x))+*+3.80)
Blue: 235~236 Ω
(http://www.wolframalpha.com/input/?i=0.85+=+(75/(75+x))+*+3.52)
Red: 235~236 Ω
(http://www.wolframalpha.com/input/?i=0.85+=+(75/(75+x))+*+3.52)
Scopes of the color lines:
EDIT:
Unsure if I scoped these with a load on the color lines. These may be less than their true values, I'll test again later.
So the results are:
Green: 3.80 Vp-p
Red: 3.52~ Vp-p
Blue: 3.52~ Vp-p
Sync: 4.0~ Vp-p
Most other consoles output to a television set at 1.7Vp-p~ (becomes 1/2 with the 75 inline resistor so effectively 0.85 is the result).
So with that in mind, the resistor values to get a 0.85Vp-p for each individual color line (assuming a 75Ω to ground in the tv) is:
Green: 260 Ω
(http://www.wolframalpha.com/input/?i=0.85+=+(75/(75+x))+*+3.80)
Blue: 235~236 Ω
(http://www.wolframalpha.com/input/?i=0.85+=+(75/(75+x))+*+3.52)
Red: 235~236 Ω
(http://www.wolframalpha.com/input/?i=0.85+=+(75/(75+x))+*+3.52)
Scopes of the color lines:
EDIT:
Unsure if I scoped these with a load on the color lines. These may be less than their true values, I'll test again later.
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