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

[Zippster]

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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