Re: Weird distorted shapes

I understand what you're saying but the wobble is on a pretty much static image ...looks more like AC on the defection.

Sent from my iPhone

On 5 Mar 2014, at 18:33, Mendel Pearl <mypearl@dds.nl> wrote:

> This is what you see when the HV isn't stable.
>
> When the HV drops (a lower accelleration voltage) the electrons move slower from the cathode to the screen and there is more time for the magnetic deflection field to do its job; the image size increases.
>
> As it fluctuates relatively slowly compared to the vector update rate, an object is drawn in a particular place, but with the next 'frame' update the HV is different so the object is drawn in a different position.
>
> Send from my Laptop
>
>
> On 5-3-2014 16:39, Simon wrote:
>> Look at the video on this guys setup
>>
>> http://forums.arcade-museum.com/showthread.php?t=304336
>>
>> That is with a standard amp deflection but a Dez HV pcb. Looks like AC ripple as the whole picture is wobbling.
>>
>>
>> Sent from my iPhone
>>
>> On 5 Mar 2014, at 13:54, Simon <simonjhanlon@btopenworld.com> wrote:
>>
>>> Try swapping blue and green ....pulls the pins at the 15pin connector and swap them over. What do the letters look like after the swap ?
>>>
>>> Sent from my iPhone
>>>
>>> On 5 Mar 2014, at 00:56, Andre Huijts <a.huijts@upcmail.nl> wrote:
>>>
>>>> Sorry my mails don't go out when I write them on my phone and I'm on the road so sometimes I lag a bit....
>>>>
>>>> My idea ? The original parts list mentions a whole range of resistors as metal film resistors but that info is not in the Dezbaz' parts list....so....maybe you used only carbon resistors ? I'm not sure, but they do select metal film resistors for a reason....
>>>>
>>>> Verstuurd vanaf mijn iPad
>>>>
>>>> Op 4 mrt. 2014 om 09:10 heeft Simon <simonjhanlon@btopenworld.com> het volgende geschreven:
>>>>
>>>>> What does the test mode crosshatch look like? Can you take a photo of it ?
>>>>>
>>>>> Sent from my iPhone
>>>>>
>>>>> On 4 Mar 2014, at 04:15, Joel Griffin Dodd <griffindodd@gmail.com> wrote:
>>>>>
>>>>>> Jimmy,
>>>>>>
>>>>>> I tried the boards on a 6100 from my Space Duel, there was very minor distortions but nowhere near as bad as this. All my text looks like it's in an Asian font lol
>>>>>>
>>>>>> On Mar 3, 2014 8:10 PM, "Joel Griffin Dodd" <griffindodd@gmail.com> wrote:
>>>>>> I rearranged all of my boards and wiring harness to make sure nothing was to close together but no change. The only other obvious power issue I can see is that I only have 2 prong power outlets in my shed, so I'm not getting a proper ground. Also I have fluorescent strips in the shed running off the same circuit, do you think they would cause an issue?
>>>>>>
>>>>>> On Mar 3, 2014 8:04 PM, "Joel Griffin Dodd" <griffindodd@gmail.com> wrote:
>>>>>> I have a dual channel scope but I'm very green with it. Should I just be looking at the XY output the way I would get a picture on the scope or use it in a different way.
>>>>>>
>>>>>> On Mar 3, 2014 6:52 PM, "Jimmy Ipock" <jipock@gmail.com> wrote:
>>>>>> A dual channel oscilloscope might be useful here. It would show noise in the x and y signals.
>>>>>>
>>>>>> On Mar 3, 2014 8:31 PM, "Joel Griffin Dodd" <griffindodd@gmail.com> wrote:
>>>>>> We've already tried the non inductive resistors but the problem remains. Anything else? Someone mentioned AC leakage into the XY amplifiers although the distorted shapes are stable, they don't flicker.
>>>>>>
>>>>>> On Mar 3, 2014 4:24 PM, "Andre Huijts" <a.huijts@upcmail.nl> wrote:
>>>>>> Yes, and I got that answer from Jed Margolin, he should know :)
>>>>>>
>>>>>> Verstuurd vanaf mijn iPad
>>>>>>
>>>>>> Op 4 mrt. 2014 om 00:29 heeft Joel Griffin Dodd <griffindodd@gmail.com> het volgende geschreven:
>>>>>>
>>>>>>> Also, not sure if it is related or not, but when the screen is 'full' with objects, like the high score table I get a noticeable 'flicker' to the whole screen, like it is struggling to update, the flickering is about 10 cycles per second (by eye) is this normal for Star Wars?
>>>>>>>
>>>>>>>
>>>>>>> On Mon, Mar 3, 2014 at 3:26 PM, Mendel Pearl <mypearl@dds.nl> wrote:
>>>>>>> Some AC on your DC rails should not matter for the output amp anyway.
>>>>>>>
>>>>>>>
>>>>>>> On 4-3-2014 00:25, Joel Griffin Dodd wrote:way
>>>>>>>> OK I can try moving things around a little tonight and see what effect that has.
>>>>>>>>
>>>>>>>>
>>>>>>>> On Mon, Mar 3, 2014 at 3:21 PM, teeray <teeray@earthlink.net> wrote:
>>>>>>>> use a scope to check the amp power supplies for AC ripple
>>>>>>>> and make

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Received on Wed Mar 5 14:08:10 2014