Re: Weird distorted shapes

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
> <mailto: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
>> <mailto: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
>>> <mailto: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
>>>> <mailto: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
>>>>> <mailto: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 <mailto: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
>>>>> <mailto: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 <mailto: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 <mailto: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
>>>>> <mailto: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 <mailto: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
>>>>>>> <mailto:teeray@earthlink.net>> wrote:
>>>>>>>
>>>>>>> use ascope to check the amp power
>>>>>>> supplies for AC ripple
>>>>>>> and make sure all of the high
>>>>>>> voltage wires are as far away from
>>>>>>> the board
>>>>>>> as possible. Also make sure the X
>>>>>>> and Y input wires are away from any
>>>>>>> high voltage.
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> -----Original Message-----
>>>>>>> From: Joel Griffin Dodd
>>>>>>> Sent: Mar 3, 2014 6:13 PM
>>>>>>> To: vectorlist@vectorlist.org
>>>>>>> <mailto:vectorlist@vectorlist.org>
>>>>>>> Subject: Re: VECTOR: Weird
>>>>>>> distorted shapes
>>>>>>>
>>>>>>> How would I check for that Tim?
>>>>>>>
>>>>>>>
>>>>>>> On Mon, Mar 3, 2014 at 3:11 PM,
>>>>>>> teeray <teeray@earthlink.net
>>>>>>> <mailto:teeray@earthlink.net>>
>>>>>>> wrote:
>>>>>>>
>>>>>>> Looks like you have some AC
>>>>>>> voltage getting into the X
>>>>>>> and Y amps.
>>>>>>>
>>>>>>> Tim
>>>>>>>
>>>>>>>
>>>>>>> -----Original Message-----
>>>>>>> From: Joel Griffin Dodd
>>>>>>> Sent: Mar 3, 2014 2:19 PM
>>>>>>> To:
>>>>>>> vectorlist@vectorlist.org <mailto:vectorlist@vectorlist.org>
>>>>>>>
>>>>>>> Subject: VECTOR: Weird
>>>>>>> distorted shapes
>>>>>>>
>>>>>>> Hi all,
>>>>>>>
>>>>>>> Doug and I have been
>>>>>>> working on building a
>>>>>>> reproduction 25"
>>>>>>> Amplifone using a new
>>>>>>> deflection board design
>>>>>>> from an Australian
>>>>>>> designer (Dez). Overall
>>>>>>> it's working extremely
>>>>>>> well, but we are seeing
>>>>>>> some odd distortion in
>>>>>>> shapes. It's most
>>>>>>> apparent in circles, but
>>>>>>> can been seen in most
>>>>>>> shapes on the screen
>>>>>>> where letters look a
>>>>>>> little warped and joins
>>>>>>> between vectors overlap.
>>>>>>>
>>>>>>> I know even 6100
>>>>>>> deflection boards do
>>>>>>> have a little of this,
>>>>>>> but it seems to be more
>>>>>>> apparent on our board.
>>>>>>>
>>>>>>> Here's an extreme
>>>>>>> example of the death
>>>>>>> star on the star wars
>>>>>>> start game menu...
>>>>>>>
>>>>>>> https://www.dropbox.com/s/i1r76l4dif9vv2w/2014-03-02%2020.10.19.jpg
>>>>>>>
>>>>>>> Doug mentioned that he
>>>>>>> thought it may be down
>>>>>>> to the tolerances of
>>>>>>> some of the new
>>>>>>> components we are using
>>>>>>> on the deflection board.
>>>>>>> I wanted to throw it out
>>>>>>> to the group to see if
>>>>>>> anyone has any ideas of
>>>>>>> where we might look in
>>>>>>> the circuit to
>>>>>>> investigate this odd issue.
>>>>>>>
>>>>>>> Joel
>>>>>>>
>>>>>>> ---------------------------------------------------------------------------
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>>>>>>> Please direct other
>>>>>>> questions, comments, or
>>>>>>> problems to
>>>>>>> chris@westnet.com
>>>>>>> <mailto:chris@westnet.com>
>>>>>>>
>>>>>>>
>>>>>>> ---------------------------------------------------------------------------
>>>>>>> ** Unsubscribe, subscribe, or view
>>>>>>> the archives at
>>>>>>> http://www.vectorlist.org ** Please
>>>>>>> direct other questions, comments, or
>>>>>>> problems to chris@westnet.com
>>>>>>> <mailto:chris@westnet.com>
>>>>>>>
>>>>>>>
>>>>>>
>>>>>>

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Received on Wed Mar 5 13:34:02 2014