Bongofish
November 20, 2018, 01:49:45 AM *
Welcome, Guest. Please login or register.

Login with username, password and session length
News: You can attach photos hosted by the forum rather than using an external image hosting site, this means they will stay forever and not disappear after a year or two.
 
  Home Help Search Login Register  
  Show Posts
Pages: 1 [2] 3 4 ... 6
16  Screen Tablet malarky / Build Logs / Re: The Raz tab on: January 16, 2013, 04:04:40 PM
That static charge thing is obviously relating to the way it was build. All I can say for sure is that the 'common' K-Jintiq build (at least my one) doesn't have these issues, not even after hours of use.

But it's all fine of course if you're satisfied with the result.
17  Screen Tablet malarky / Build Logs / Re: The Raz tab on: January 15, 2013, 09:55:07 AM
Aerendraca said it all. Most likely you would get rid of the jitter/random clicks, if you shield the pcb's and the ccfl tube as described before and finally adjust the screen's frequency until you reach its 'sweet spot' without issues. I'm not able to explain why that works electrically, but it does.

While my 'shielding' was not connected after I changed the ccfl, it jittered and random-clicked like hell, no matter what the frequency was set to.
18  Screen Tablet malarky / Build Logs / Re: The Raz tab on: January 04, 2013, 02:02:00 PM
Ah, thanks for the clearing up about the flickering. Sounds like this is what I get when I use the VGA connection.

I'm kind of surprised that you don't seem to get jitter (your assuming is right) without shielding the LVDS/ccfl. But don't worry, if it works it works  Cool
19  Screen Tablet malarky / Build Logs / Re: The Raz tab on: January 04, 2013, 11:43:25 AM
Well done! Good to know that there are different ways to keep the jitter (>flicker?) away within that set of parts.

So if I get that right, you basically extended the screen pcb's ground spot with an 'aluminium shield' which is then placed between the wacom's and screen's pcb?!

And since the connection to the wacom's metal backplate is obviously gone, how did you reconnect that?
20  Screen Tablet malarky / Successful builds! / Re: Waco: Intuos4 XL with 27 inch display with integrated touchscreen on: January 03, 2013, 01:20:47 PM
Well done, can we see some pictures? Interesting thinking about the PC/laptop thing, though with a laptop at the wrong settings it might jitter as hell, too.
21  Screen Tablet malarky / Build Logs / Re: The Raz tab on: January 03, 2013, 12:38:25 PM
I see. Hopefully the VGA connection doesn't behave so weird in your case. I'd give it a try anyway.

I experienced a similar behaviour you just described on my build until the shielding was connected as shown in the pictures.

Again: All my shielding 'hardware' (teko boxes, coppertape 'tube' & ccfl frame) is just connected by the contacts around the pcb's mounting holes. On the LVDS pcb itself these are already connected to its power plug's negative wire and the VGA/DVI outer shells by default.

Ah, by the way, the coppertape is wrapped around the entire outside of the ccfl cable. Afterwards the whole thing is insulated with tape. Sorry, guess you got that  Wink

Unfortunately I don't have a clue what certain kind of grounding that is, probaply the car body one. What I do know is that it really works perfectly (Macbook, DVI, at 66Hz) that way.
22  Screen Tablet malarky / Build Logs / Re: The Raz tab on: January 03, 2013, 10:23:27 AM
Wow, as supposed Aerendraca's answers are saying more than I ever knew about it.. stunning simple explanation about the RFI/Faraday cage.

Plus I never really thought about the fact, that there are different grounding possibilitys. Basically the one like in a house at the safety ground, the other like in a car with all negative wires connected to the car body. Great, now I know I don't know nothing at all  Cheesy

23  Screen Tablet malarky / Build Logs / Re: Cint®iq 2.0 [K-Jintiq clone] on: January 03, 2013, 10:02:22 AM
Right, the ground is connected to the VGA/DVI outer shells and also to the inner wire of the power plug. The picture (hope this is ok with njytouch) shows the ground parts of the LVDS pcb which are connected to each other.

EDIT: By the way, I'd recomment using the DVI connection. In my case, the VGA shows weird colours, some jitter and strange dark vertical lines on the screen.

I propose for taking the conversation over to your build log at this point to keep it together.


[attachment=1]R.RM5251 grounding spots
24  Screen Tablet malarky / Build Logs / Re: The Raz tab on: January 02, 2013, 07:21:33 PM
The battery in the first picture just means you can get the required 12V/4A from a battery or other source, too. I fear I still don't really get what you meant by using a depleted battery as substitute for earth, thought you just wanted to use it as power source. Sorry for the confusion.

The one in the second picture is to lighten up the bulp if you put the probes to a thing from which you want to know if it's conductive or not. The voltage should be low, just enough to lighten up a single bulb or led.
25  Screen Tablet malarky / Build Logs / Re: The Raz tab on: January 02, 2013, 04:45:22 PM
Great, thanks Aerendraca.
26  Screen Tablet malarky / Build Logs / Re: The Raz tab on: January 02, 2013, 04:37:23 PM
 Embarrassed Sad to hear about these things being so expensive over there. To me it was mandatory to know if everything is connected as supposed to be. My tablet is at home, I made you a quick pencil sketch on how I shielded everything plus an idea about a diy-multimeter. Maybe someone comes up with a better idea in addition later.

Actually with the shielding you want to build a big 'tunnel' from out the negative cable. The pcb's and everything that produces rf are placed into that tunnel.

Basically I guess you can change the 12V(4A!) source to whatever you like (guess Wei or someone took it from the laptops firewire plug), but no idea if or how that affects the shielding quality.


[attachment=1]lousy sketch about my shielding

[attachment=2]lousy sketch/idea on a cheap multimeter?!
27  Screen Tablet malarky / Build Logs / Re: The Raz tab on: January 02, 2013, 02:57:49 PM
Guess it would be good to get yourself a cheap multimeter. They have a mode that makes them beep when you connect the two probes. That way you can check easily which parts are connected and which are not. If your box is not from pure tin, it might eventually be conductive enough..?
28  Screen Tablet malarky / Build Logs / Re: The Raz tab on: January 02, 2013, 02:32:24 PM
No deal, I'm glad to help you out if I can and I'm far away of being professional in electrical things, too.  Wink

If tin is not conductive, you will just ground the screws. You'd need to put a wire between two of the both pcb's mounting points. I'm not sure but I think it's crucial to have a conductive enclosure around the pcb's, too. I guess Aerendraca and bernard could explain that much more professional.

I don't remember who, but someone experienced even worse jitter while the sheet/box whatever was not grounded than without any shielding.
29  Screen Tablet malarky / Build Logs / Re: Cint®iq 2.0 [K-Jintiq clone] on: January 02, 2013, 02:15:44 PM
The cable plug provides the ground. Everything that needs to be grounded must be connected to the negative (inner) wire of the LVDS pcb. The small tin copper aeras around the pcb's mounting holes are already connected to it, so you just need to connect these to a (conductive) case.
Sorry for my english, keep on asking if you don't get me.
30  Screen Tablet malarky / Build Logs / Re: The Raz tab on: January 02, 2013, 02:05:12 PM
That will mix up the screen's and tablet's grounds. It worked for some but I kept them seperate like Hieron and Kareltje did.

The screen's ground goes from its inner cable wire into the pcb and from there into the aeras around the pcb's mounting holes. From there you have to make a connection to the ccfl pcb's mounting holes. With steel enclosures they simply connect through the mounting screws.

You should insulate eveything exept these 'ground aeras' in case tin is conductive.
Pages: 1 [2] 3 4 ... 6
Powered by MySQL Powered by PHP Powered by SMF 1.1.21 | SMF © 2015, Simple Machines Valid XHTML 1.0! Valid CSS!