Re: Weird distorted shapes

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 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
>>>> 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> 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
>>>>> 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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>>>>> or problems to chris@westnet.com
>>>>
>>>>
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>>>>
>>>
>>>
>>>
>>

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Received on Mon Mar 3 21:52:34 2014