The NEW Build Your Own Arcade Controls
Main => Monitor/Video Forum => Topic started by: SORHP on January 23, 2021, 09:01:50 pm
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Checking to see if there is an alternative to the Jpac for the protection of the video signal to an arcade monitor?
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see gambaman's awesome VGA-to-Scart adapter thread - http://forum.arcadecontrols.com/index.php/topic,160869.0.html
I'm working on an update to the mod mentioned in post # 49 of that thread. It's double-ended now, male on one end and female on the other. Basically it takes RGBHV in, and if H-sync is running at 15Khz the green light comes on and it passes c-sync out the female end. It requires you to make the circuit board, install it between a male and female connector, and then to connect R, G & B from input to output - so if the sync is withheld you still get a scrambled video image, but it's the sync that's dangerous.
It's obviously ONLY a 15kHz video protection circuit, not a video buffer or amp (the latter being usually required by an arcade monitor) nor a keyboard/joystick encoder. If you're not into soldering i could probably sell you one once i finish making them.
(https://i.imgur.com/16Qu2cJ.png)
(https://i.imgur.com/bNxo4n2.png)
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This spinoff idea of yours (and gambaman's original scart adapter of course) has some potential I think. Well done :applaud:
By keeping it to a simple vga in/out, there are a lot of ways to use it in cabs and other setups. Just plug in at each end.
Even without the VGA jacks, it could be used as a drop-in module for other projects.