[sdiy] Modular Video?

[John L Marshall]

This will work on color television as well. The X and Y deflection are
electromagnets that can be driven from an audio amplifier. The will be three
Z axis signals Red, Green and Blue. those signals modulate the cathode
current for three guns in the tube.

WARNING!
Some televisions do not have isolation from the mains circuit. The chassis
can be at full mains potential. This can be fatal for you or your
electronics.

Years ago, a friend was using a television as a computer monitor. It worked
well for a while. Then he plugged the TV in with the plug reversed from
before. His S-100 computer was completely destroyed. Copper lands were
melted from the bus IC's were cracked and melted on every plug in card.


----- Original Message -----
From: Dave Magnuson <resfreq at hoohahrecords.com>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Thursday, September 13, 2001 4:23 AM
Subject: Re: [sdiy] Modular Video?


> At 01:14 AM 9/13/01 -0500, you wrote:
> >>
> >> Why not convert an old television to vector operation?
> >>
> >>
> >
> >Bear in mind televisions generate lethal voltages, NEVER work on line
> >operated equipment while it is plugged in.
> >
> >That is very easy to do for an old black and white TV. Just remove the
yoke
> >(deflection coils) from the back of the tube, but leave it connected.
Place
> >another yoke over the back of the tube and drive it with two channels of
a
> >stereo amplifier. The yoke have an impedance of 8-16 ohms and looks just
> >like a speaker to the amp.
> >
> >This is covered in Electronotes #45 page 18 "Image Generation Using
> >Electronic Synthesis Techniques" by Mark Goldstein
> >
> >For a picture of such a setup see
> >
> >http://www.musicsynthesizer.com/PAIA/paia.html
> >
>
>
> I have a question....  why specifically do you need a black and white TV?
> Do color TVs work under a different principle? (I have a 13" color TV that
> could stand a little choppin')
>
> Thanks for the link!
>
> Dave
>
> Resonant Frequency:
> resfreq at hoohahrecords.com
> http://www.hoohahrecords.com/resfreq/index.html