Re: Weird distorted shapes

On the death star, it looks like its made of curves / splines instead of straight lines. I'd guess that when it's drawing , its kind of accelerating / decelerating (maybe a slightly delayed response to the game xy signals) the beam instead of drawing it at a fixed velocity, this could explain the curves and distortion in the more detailed shapes. What could cause this ? - Some kind of unwanted capacitance or inductance somewhere or that you can only pass lower frequencies (acting like a low pass filter) ? We don't know how the new design of the deflection circuit performs - does it drive a standard amp vector monitor ok ?(maybe some of the components or the overall design is not fast enough to cope ?)  - Or could you be using an odd yoke ? Could you try an origonal delfection board on it ?  - Or I guess maybe you could try driving some load resistors instead of the yoke and try scoping across them (would that work ?) Regards, Col ________________________________ From: Joel Griffin Dodd <griffindodd_at_gmail.com> To: vectorlist_at_vectorlist.org Sent: Tuesday, 4 March 2014, 14:56 Subject: Re: VECTOR: Weird distorted shapes Cross hatch looks good and the BIP is spot on. I hooked up my XY scope and zoomed in on the letters on the cross hatch screen. Pic here... https://www.dropbox.com/s/ioixnfrai1h4hq6/2014-03-04%2006.43.38.jpg The letters are well formed and not all squiggly. So we can rule out the game boards and power supply. We already did non inductive resistors with no change. On Mar 4, 2014 12:10 AM, "Simon" <simonjhanlon_at_btopenworld.com> wrote: 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_at_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_at_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_at_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_at_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_at_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_at_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_at_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_at_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_at_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_at_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_at_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_at_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 --------------------------------------------------------------------------- ** Unsubscribe, subscribe, or view the archives at http://www.vectorlist.org ** Please direct other questions, comments, or problems to chris_at_westnet.com >>>>>>>>>>>> >>>>>>>>>>>--------------------------------------------------------------------------- ** Unsubscribe, subscribe, or view the archives at http://www.vectorlist.org ** Please direct other questions, comments, or problems to chris_at_westnet.com >>>>>>>>>> >>>>>>>>> >>>>>>>>
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Received on Tue Mar 4 11:30:56 2014