[Coco] Cross Post from the Facebook Page about the RGB2VGA Board

[John B]

Thanks Ed.  I might try some out.

On Fri, Jul 10, 2015 at 11:56 PM, Zippster <zippster278 at gmail.com> wrote:

> My favorite is AIM brand 3.3% RA cored (fully activated) .032” 63/37
> solder.
> It flows better than anything else I’ve tried.  I use it for everything
> including SMT.
>
> I get it from this seller on eBay in 1lb spools.  ~$20 delivered
>
> <http://www.ebay.com/itm/251485477311 <
> http://www.ebay.com/itm/251485477311>>
>
> - Ed
>
>
> > On Jul 10, 2015, at 10:31 PM, John B <trymyz at gmail.com> wrote:
> >
> > That makes sense.  I am on a much smaller scale.  LOL  Where do you get
> > your solder from?  Could you send me a link to what you use?
> >
> > On Fri, Jul 10, 2015 at 11:27 PM, Zippster <zippster278 at gmail.com>
> wrote:
> >
> >> If you were applying it a little at a time I guess I could see that,
> >> but submerging boards in an inch or two of iso works perfectly for me.
> >> I do go through a lot, but it’s cheap.
> >>
> >> I use a high rosin flux leaded solder (3.3% flux) as well as plenty of
> >> Amtech 4300 (syringes) when called for, so the boards are well fluxed
> when
> >> finished.  :)
> >>
> >> I’m doing tens or dozens of boards at a time, so a plastic bin and a
> >> serious bath is my method.
> >>
> >> - Ed
> >>
> >>
> >>> On Jul 10, 2015, at 10:11 PM, John B <trymyz at gmail.com> wrote:
> >>>
> >>> Ed,
> >>>
> >>> I have some flux and electronics cleaner I use.  Alcohol works good but
> >>> takes way to much to clean rosin flux.  Even my flux cleaner takes some
> >>> effort.  Its the cheap stuff from the local electronics store.  I
> should
> >>> probably invest in the more expensive flux cleaner.
> >>>
> >>> On Fri, Jul 10, 2015 at 11:05 PM, Zippster <zippster278 at gmail.com>
> >> wrote:
> >>>
> >>>> I’m following this thread with interest, as I’m going to be finishing
> up
> >>>> theRGB2VGA boards that people had ordered from Kip
> >>>> to get that project successfully completed.
> >>>>
> >>>> It is true that different monitors are more or less tolerant to
> certain
> >>>> differences in signals, that could explain
> >>>> some of what is being seen here.
> >>>>
> >>>> Regarding cleaning boards, 91% isopropyl alcohol works wonderfully.
> >> What
> >>>> I do is submerge the boards in the iso in a small
> >>>> tupperware type container, soak for 10 minutes or so, brush them with
> a
> >>>> toothbrush while in the bath, then rinse with fresh iso and air dry.
> >>>> Be sure to use the 91%, the lower concentrations have too much water
> in
> >>>> them.  It’s available at drug stores, walmart, etc.
> >>>>
> >>>> - Ed
> >>>>
> >>>>
> >>>>> On Jul 10, 2015, at 9:39 PM, Steve Batson <
> steve at batsonphotography.com
> >>>
> >>>> wrote:
> >>>>>
> >>>>> John,
> >>>>>
> >>>>> Have you changed the resistors yet, or are you using the resistors
> >>>> recommended for the design? I was seeing jitter, where the entire
> screen
> >>>> would jerk and occasional waves going through it mostly noticeable on
> >> the
> >>>> edges. Also, it didn't seem consistent, sometimes it was worse than
> >> others.
> >>>> Based on what Roger had found, it sounded like there were a number of
> >>>> issues being caused by the original resistor values. Voltage Levels
> were
> >>>> not what they should be. Also there was issues with the HSYNC and
> VSYNC
> >>>> again caused by original resistor values. Luis and posted on the FB
> >> page a
> >>>> response to one of my questions that some CoCo's are noisier than
> others
> >>>> and this may very well be true, but I'd guess symptoms could be worse
> on
> >>>> some systems then others which could be the combination of the CoCo
> and
> >>>> Monitor. From discussions with Roger about this and how he fixed it,
> I'm
> >>>> going to go out on a limb here and suggest that with his suggested
> >> resistor
> >>>> values, the video will most likely be crisp, clean and jitter free on
> >> most
> >>>> any CoCo and VGA monitor unless they have problems of their own.
> >>>>>
> >>>>> It was a bit of a pain in the butt pulling a bunch of resistors out
> and
> >>>> replacing them with Rogers suggested values, but I'd highly recommend
> >> it if
> >>>> you haven't done so already. It was totally worth it! If you have
> >> already
> >>>> replaced the resistors with the new values and are still having
> issues,
> >> I'd
> >>>> suggest the following:
> >>>>>
> >>>>> 1) Inspect your board and make sure you have no possible shorts.
> Clean
> >>>> it real good with alcohol or other good electronic board cleaner and
> >>>> thoroughly dry.
> >>>>> 2) Check all the cables including power going to the board and make
> >> sure
> >>>> all is well
> >>>>> 3) Make sure the ribbon cable isn't right next to a transformer
> >>>> including the CoCo power power supply (thought I am not having issues
> >> even
> >>>> if set the board right on top of the CoCo above the transformer). This
> >>>> probably is NOT an issue.
> >>>>> 4) Remove wire I mentioned that was a ground fix.
> >>>>>
> >>>>> Anyway, let me know if you have changed the resistors yet or not. I'm
> >>>> very curious to see where you are at.
> >>>>>
> >>>>>
> >>>>
> >>>>
> >>>> --
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> >>>> Coco at maltedmedia.com
> >>>> https://pairlist5.pair.net/mailman/listinfo/coco
> >>>>
> >>>
> >>> --
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> >>> Coco at maltedmedia.com
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> >>
> >>
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> >>
> >
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