Hi Folks!
Hope you can help me (again) attaching a cathode-ray-tube (TV Screen) to my SBC. It's been canibalised from an old GRUNDIG SYSTEM 5300 Oscilloscope and has a monochrome screen with approx. 3" diagonal size.
There are...
- 2 thick lines (red/blue), I think they're for power connection
- 5 lines (Orange, Green, Brown, Yellow, White, Yellow-Blue, Brown-White)
- 2 very thin yellow lines
... leading out the tube
I want to display simple graphics (such as a PONG Game) and text (Monitor, EhBasic etc.).
Please note that my budget is limited because I'm a 15 year old pupil.
PS Thx for all your hints you wrote before !!!!!!!
C.ya
Daniel
Cathode-Ray-Tube controll ????
Cathode-Ray-Tube controll ????
---===[HeLlRaIsA]===---
Oh my god
If I understand you correctly, you've got a bare CRT
with no drivers or power supply or even a protective case.
That presents some problems, not the least of which is
that it likely involves LETHAL voltages in the kilo volt
range.
Not a beginners project.
I'd strongly encourage you to find an old, but still
functional, monitor, or even an old television set.
Now if it were a whole and functioning oscilloscope
that would be different.
I've heard it said that after years of use and exposure
to the high voltages the glass of a CRT can end up with an
electrostatic field permanently "impressed" in to it,
it becomes an electret (sort of a permanently charged
capacitor, the electro static analog of a magnet) and
that that can present a hazard. (though I've never actually
seen that)
If I understand you correctly, you've got a bare CRT
with no drivers or power supply or even a protective case.
That presents some problems, not the least of which is
that it likely involves LETHAL voltages in the kilo volt
range.
Not a beginners project.
I'd strongly encourage you to find an old, but still
functional, monitor, or even an old television set.
Now if it were a whole and functioning oscilloscope
that would be different.
I've heard it said that after years of use and exposure
to the high voltages the glass of a CRT can end up with an
electrostatic field permanently "impressed" in to it,
it becomes an electret (sort of a permanently charged
capacitor, the electro static analog of a magnet) and
that that can present a hazard. (though I've never actually
seen that)
-
GARTHWILSON
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I have a basic CRT driver circuit here I got from an amateur radio handbook and I could fax it to you, but it calls for a 2000-volt power supply as bogax says. I don't know what kind of input voltages it would require, but I suspect you'd need a signal swing of at least a couple hundred volts (not including bias) to deflect the beam from one edge to the other.
The CRTs used in oscilloscopes aren't like the ones used in TVs - they're designed for extremely high horizontal sweep speeds. The voltages and frequencies required will likely be completely different.
Stay well away from it unless you know exactly what you're doing and have complete data on the particular tube that you've got. They can be very dangerous things.
Stay well away from it unless you know exactly what you're doing and have complete data on the particular tube that you've got. They can be very dangerous things.