On Tuesday 22 September 2015 09:42:51 Rick Lair wrote: > Hello Guys, > > This is off topic for sure, but knew of no better place to ask with > all the electronics knowledge floating around here. > > On our big vertical lathe, it has an old 9" CRT that is starting to > give us troubles, and I would like to convert it to an LCD, the only > problem is, that I am having a hard time figuring out the signaling > going to the new monitor. It is a Fanuc control, so it has a Honda 20 > pin male connector going to the CRT unit, which I scavenged up the > diagram for the pin-out. I have 20 pin female connectors here already, > so I can make a patch cable to VGA to connect it to the new monitor, > but the signals are different from one to another. The current CRT has > Hsync, Vsync, and a single wire Video signal, along with three 0V > wires in the harness, and on a separate connector, the power for the > monitor. But a standard VGA has Red, Green, Blue, then Hsync, and > Vsync, and a few GRD connections. > > Maybe I need a signal converter, I have found quite a few of them on > eBay, or can I just make up a cable and run with it?
Those 0 volt wires are more than likely shielding returns to be grounded and could likely be combined at the grounded terminal of the db15, so you could probably knock out a merging pcb on the mill in half an hour or so. The 9" I have to assume was black & white? That, in todays all color lcd's might have to be buffered with a gain control and resistively fed to all 3 colors on the vga cable. See the TI opamp selections for the buffer as they have a good selection of video speed opamps that can run on a single 5 volt supply, for something in the sub $2 price. I used several of them as replacements for a custom circuit in a GVG video switcher that the Grass Valley Group wanted $1500 a copy for, and they were actually faster than theirs was. 15 Years ago, so the stuff is available. I'd quote the Jedec number but have forgotten it. You want a single 5volt supply unit with a gain/bandwidth product of a about a gigahertz for that. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
