convert TV/monitor to XYZ monitor

[Hairy Harry]

The TV can work this way as the scope displays are
X-Y and not swept. DC response is not possible though.

You will be isolating the yoke from the TV drive circuit...
they are just (supposedly) insulated. They will pick up
some HV static from the picture tube though.... Maybe still
kick your @ss if you're not careful...

H^) harry


>From: Dave Halliday <daveh at microsoft.com>
>To: "'XinclXsynth-diy at mkv.mh.se'" <XinclXsynth-diy at mkv.mh.se>,        
>synth-diy at node12b53.a2000.nl
>Subject: RE: convert TV/monitor to XYZ monitor
>Date: Fri, 6 Oct 2000 12:23:41 -0700
>
>About the only thing you can do is to disconnect the yoke circuitry from 
>the
>TV chassis and to drive the two coils from an audio amplifier.
>
>There is no real way to make it into an oscilloscope without a total
>redesign of the circuitry.  The reason for this is that the sweep of the TV
>screen is determined by a resonant oscillator, not a timebase generator and
>to do any sort of O-Scope display, you need to have it driven by a timebase
>generator for the X axis and a DC-coupled amplifier for the Y axis.
>
>Also, remember that the chassis of the TV ( at least in the US ) is
>frequently at line potential.  You are dealing with some incredibly lethal
>voltages and if you don't know exactly what you are doing in there ( ie:
>asking this kind of question in the first place <grin> ) then stay the hell
>away  -  or at least have someone standing by at all times who knows
>cardio-pulmonary resuscitation techniques.
>
>
>
>-----Original Message-----
>From: XinclXsynth-diy at mkv.mh.se [mailto:XinclXsynth-diy at mkv.mh.se]
>Sent: Friday, October 06, 2000 12:31 AM
>To: synth-diy at node12b53.a2000.nl
>Subject: OT: convert TV/monitor to XYZ monitor
>
>
>Leaving semilurkng mode for awhile and I know this is kind of OT but this
>is were the knowledge is.
>
>I've done some "oscillographics" bye running to signals from various
>modules into the X and Y of my oscillocope. Synched oscillators and
>ringmodulators can  do wonders.
>Now I want ot expand this to a larger screen and also make it into a XYZ
>setup and my  eyes fell on a computermonitor I have left over.
>
>Does anyone know of any online schematics or an articel on how to convert a
>teve or monitor to a XYZ-monitor?
>I have some old Elektor articles from 1978 were you  draw oscilloscope like
>curves onto a normal videomonitor but it didn't provide X-control which is
>crucial here.
>The straight CV into  XYZ setup is very lowlevel approach to draw lines
>onto a CRT so maybe I heading the wrong way? Is it perhaps better to try to
>find some modules that draws these line in a normal color-tv video signal.
>It would allow for expanded mixing and interacting with other video
>equipment. But that would quite possibly also include microprocessing,
>framebuffering etc and I'm kind into the analogue thing right now.
>
>http://www.AudioVisualizers.com/ has a lot of info, articles and a few
>suggestions on schematics but none of it is what I need right now.
>
>any hints, suggestions, books, articles? I'm all ears.
>
>//Per
>
>"The problem with todays newage music is that there's no evil in it!" - 
>Eno.
>__________________________________________________________________________
>Per Mattsson                               Per.Mattsson at mkv.mh.se
>Lecturer and Computersystems manager       Phone: +46-60-148825
>Department of Media and Communication      GSM: +46-70-6524567
>Mid Sweden University, Sundsvall, Sweden   Fax:   +46-10-148934
>

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