Re: Weird distorted shapes

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 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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>>>>>
>>>>>
>>>>> ---------------------------------------------------------------------------
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>>>>>
>>>>
>>>>
>>>>
>>>

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Received on Mon Mar 3 23:04:57 2014