MOD GUIDE - Universal RGB-to-YPbPr/Component Circuit & Mod [8/24/2014]

[ConHuevos]

In Vp-p?  If you have tools to measure impedance I'd appreciate the approximate amounts.  If they are indeed higher than .77Vp-p I'll need to use a divider to drop them down.

[Keith Courage]

Well I am sure hoping this is going to be my last component mod problem. Anyways, I have installed the component board in a DUO. I even installed the two 22UF capacitors for the jail bar fix but the jail bars are still present. Now here is the interesting part. This DUO also has an 8PDT switch installed for a region mod. Well, if I touch the wires on the 8PDT switch the jail bars disappear. Any idea how to fix this problem? I already tried running a ground wire a wrapping it around the wires for the 8PDT switch and that did nothing. Only when I touch the wires do the jail bars go away.

[thesteve]

keith its a wire routing issue
caps to ground couls solve it and cause game glitches

[thesteve]

Anyone know the impedance for the RGB lines coming off the 6260 by chance?

the lines are running open stock
the outputs that are used are running into approx 1K loads

[Keith Courage]

You were right thesteve. It was a wiring routing issue. I didn't even consider it because none of the wires were even close to touching one another before when the problem was present.

[turbokon]

Glad you solved the problem Keith.

Also, thesteve said this design should work for all rgb enabled systems by adding three 1kohm resistor to the rgb signals. Thesteve and I installed the component video boards with the additional resistors in our genni and its works flawlessly.

[ConHuevos]

Is the last schematic posted the latest version or have there been updates?  If so, can you post them?

[thesteve]

the schematic is correct in the first post

all the caps are now 22uf ceramic

[ConHuevos]

Awesome thanks, currently making a board in Eagle to send to oshpark .

Oh nevermind...read your post in the sales section.

Turbokon really should edit his post as he is generalizing that all other console will only require 1k extra resistance on the RGB inputs, when it's impedance dependent.

[turbokon]

Awesome thanks, currently making a board in Eagle to send to oshpark .

Oh nevermind...read your post in the sales section.

Turbokon really should edit his post as he is generalizing that all other console will only require 1k extra resistance on the RGB inputs, when it's impedance dependent.

Thesteve, correct me if I'm wrong, the 1kohm resistors are needed to help with the offset voltage cause by the genni's rgb lines outputting at a higher voltage then the pce. Impedance is something different, is the ratio of voltage to current in a ac circuit. This design operates in a dc, so impedance and resistance are the same. Theoretically, the additional 1kohm resistance should work with other rgb systems.

[ConHuevos]

Awesome thanks, currently making a board in Eagle to send to oshpark .

Oh nevermind...read your post in the sales section.

Turbokon really should edit his post as he is generalizing that all other console will only require 1k extra resistance on the RGB inputs, when it's impedance dependent.

Thesteve, correct me if I'm wrong, the 1kohm resistors are needed to help with the offset voltage cause by the genni's rgb lines outputting at a higher voltage then the pce. Impedance is something different, is the ratio of voltage to current in a ac circuit. This design operates in a dc, so impedance and resistance are the same. Theoretically, the additional 1kohm resistance should work with other rgb systems.

I'm curious about your design Turbokon, I notice thesteve's schematic on the front says 1K off the B, R lines, and 1K on the sync.  But on your PCB  you're using 2K on the R,B, 1K for G and 510 Ohm on the sync.

I can't tell from your genesis picture...but you added another resistor to the board, which is an additional 1K  on RGB?  So are you using 3K Ohm's off the R, B lines and 2K on G with the genesis?

[thesteve]

the resistors on the board stay the same, as they are for signal mixing balance
the PCE outputs the RGB signals at the desired 0.7V output spec expected by monitors and my circuit
the geni outputs double voltage as its expecting 75ohm resistors on the outputs to feed 75ohm loads

[thesteve]

snes working
same setup as geni

[MotherGunner]

Hi Everyone, just wanted to thank turbokon for his wonderful mod work!  He did an LED, component, S-Video, and audio jack mod on my system.

My son absolutely loves playing and I am happy with the results.  I reiterate what he says that you do need an HDTV that supports these signals.  My TV does not support the component mod well as there is a lot of noise in the blacks but the image still looks pretty good!  S-Video looks outstanding. Check out.  (Sorry about the lighting on some of these)

Component





S-Video





Will be doing more mods through turbokon when I get more hardware!

Thanks again!

[turbokon]

No problem MG:)