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Author Topic: PC Engine / Turbografx16 s-video mod  (Read 1802 times)

Drakon

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PC Engine / Turbografx16 s-video mod
« on: July 17, 2012, 01:43:41 PM »
Video signals come from the huc6260 chip

Revised circuit:









New demo capture:
« Last Edit: July 27, 2012, 05:48:44 AM by Drakon »
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Keith Courage

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Re: PC Engine / Turbografx16 s-video mod
« Reply #1 on: July 17, 2012, 03:23:01 PM »
We already have a write up on this here http://www.pcenginefx.com/forums/index.php?topic=10850.105. Your method is a bit different than the method that some of us here have been using. I wonder if there is a quality difference between the two?
« Last Edit: July 17, 2012, 03:28:33 PM by Keith Courage »
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Drakon

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Re: PC Engine / Turbografx16 s-video mod
« Reply #2 on: July 17, 2012, 11:36:27 PM »
Yeah I never found yours so when my pc engine showed up I just made my own.  Well the beauty of my circuit is the only parts needed are some wires and a s-video jack.  I just removed 1 resistor and straight wired and the picture looks perfect  8)

You certainly don't need a transistor to amp the luma once you disconnect that resistor.  The luma looks perfect straight from the chip when it's connected to nothing else.
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Keith Courage

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Re: PC Engine / Turbografx16 s-video mod
« Reply #3 on: July 18, 2012, 06:47:24 AM »
Ah I see, so in doing so the RF jack no longer works? Does the composite out of the rear pin out still work?
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thesteve

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Re: PC Engine / Turbografx16 s-video mod
« Reply #4 on: July 18, 2012, 07:07:49 AM »
no composite and RF are disabled by this mod
further the 6260 chip is overloaded






edited to correct chip number
« Last Edit: July 18, 2012, 04:54:44 PM by thesteve »
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Drakon

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Re: PC Engine / Turbografx16 s-video mod
« Reply #5 on: July 18, 2012, 11:30:27 AM »
Quote from: thesteve on July 18, 2012, 07:07:49 AM
no composite and RF are disabled by this mod
further the 6280 chip is overloaded

Overloaded in what way?  It works fine wired like this.
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thesteve

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Re: PC Engine / Turbografx16 s-video mod
« Reply #6 on: July 18, 2012, 04:54:03 PM »
the supply is drawn down as the 6260 was not designed to drive loads.
also the output from the chip has a significant voltage offset.
i am not denying that it worked for you, just it will depend greatly on the monitor.
as to the overload i cant say if the chip will fail from it or not.
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Drakon

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Re: PC Engine / Turbografx16 s-video mod
« Reply #7 on: July 18, 2012, 10:43:09 PM »
well I wired in a single transistor amp / buffer and it was too bright.  So I straight wired it and the brightness is perfect.  I cleared all of street fighter 2 yesterday and no issues.

pictures:

« Last Edit: July 25, 2012, 10:04:42 PM by Drakon »
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thesteve

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Re: PC Engine / Turbografx16 s-video mod
« Reply #8 on: July 19, 2012, 05:06:55 AM »
use the transistor amp/buffer to protect the chip and add a resistor to bring down the brightness
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Drakon

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Re: PC Engine / Turbografx16 s-video mod
« Reply #9 on: July 19, 2012, 10:56:38 PM »
Quote from: thesteve on July 19, 2012, 05:06:55 AM
use the transistor amp/buffer to protect the chip and add a resistor to bring down the brightness

For the sake of science I'll leave my system wired up the way it is and if it ever stops functioning or blows up I'll be sure to let people know about it.
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Drakon

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Re: PC Engine / Turbografx16 s-video mod
« Reply #10 on: July 25, 2012, 01:05:41 PM »
Whoa you guys were totally right!  The picture looks much better with the 1 transistor amp and then a resistor.  Thanks a lot for correcting that.
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thesteve

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Re: PC Engine / Turbografx16 s-video mod
« Reply #11 on: July 25, 2012, 02:56:16 PM »
not a problem
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Duo_R

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Re: PC Engine / Turbografx16 s-video mod
« Reply #12 on: July 25, 2012, 06:41:10 PM »
Wow awesome job here! That's crazy that it is that simple
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Duo_R

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Re: PC Engine / Turbografx16 s-video mod
« Reply #13 on: July 25, 2012, 06:42:08 PM »
Also I am wondering if one of those S-video to composite adapters would give a good picture for composite video....
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thesteve

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Re: PC Engine / Turbografx16 s-video mod
« Reply #14 on: July 25, 2012, 06:48:06 PM »
should
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