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This is not an easy problem to solve.
What resolution do you need.
I would look at some old VGA board drivers, they provide you with most of the basic circuits.
You need high voltage to directly control the yolk deflection coils. Please be very careful, those levels can kill.
The electron gun is a lower control voltage, if you check the VGA designs, they were all TTL for the RGB inputs.
The short answer is yes you can, but unless you know what you are doing, no you should not attempt.
When I went through Tech school fifty years ago, we were taught how to work with CRT voltages. I would consider that level of training as the minimum needed to work with the voltages.
hi thanks for the reply
and yes not an easy problem at all but the way i see it the whole crt community surely could use a plug and play(to some extent) solution for crt tubes.
but thanks for your input ill start doing some research into vga circuits and i can assure you i wont be messing around with the hot end of the system until a long ways down the track .
would it be possible to approach this from a point of reusing an existing jungle chip and creating a new board to use said chip ?therefore keeping any original input capabilities wile being able to use newer components on a smaller sized over all board ?
I am not familiar with the jungle chip, so I do not know.
Jungle chip is a generic term specifically describing the video processing chip in CRT driver cards that, among other things, can convert composite signals to RGB signals.
There are lots of CRT driver schematics available with a simple search on the internet if you want to get down to the component level. If you want to find a CRT driver card already built, they are approximately free. Anyone who has an old CRT squirrelled away would likely be happy to give it away.
If you want to modify an old TV to take RGB, there are lots of YouTube instructions on how to do it.
Be sure to blog here about your build - it sounds interesting.
hi yes i have seen people ad rgb to a standard crt tv but i think id rather go down the route of making a pcb for an existing jungle chip
thanks for your input iv got a few good starting point to work from ill be sure to let you know how it goes
Have found a Texas Instruments RGB Crt video design guide working thru the board schematics for the
TI RGB preamplifier and the TI LM2419 Crt Driver ICs so im hoping this will be a good start there design included
contrast control, brightness control, cutoff adjustment, delta gain adjustment (for white balance) and blanking
This might be blasphemy, but have you thought about using a modern LCD with driver software that simulates the look of old scanline CRTs?
A search for "CRT monitor simulator" turned up a lot of results, but I don't want to recommend anything, as I have no experience with any and don't know your system requirements.
Just a thought.
hey thanks for the input but i have messed around with some lcds and emulators and to me at least it doesn't compare to original crt and hardware(plus that would be easy and a good project wont be easy ahaha)
thanks or the suggestion tho all input is appreciated im really just learning as i go building upon what i know of electronics so far so its good to see how others might approach it.
It is certainly possible, but I don't think it's worth the time, effort, and money put into it. An FPGA can easily handle the task of converting an input signal into the necessary outputs for the CRT, but you will need to build a bunch of high voltage logic as well that controls the CRT based on the FPGA's outputs.
i like the thought but i think fpga programming lies outside my current abilities
it probably would be one of the better options but it might not be the most pocket friendly option i think ill stick to reutilizing a chip from a crt and revise the pcb its mounted to
I don't know your experience in electronics. The old CRT monitor has been obsolete for decades. There is no single chip in which you can build everything in one.
Such a CRT monitor needs some 1000V, starting with R-G-B 12kV, so that the electron beam can be drawn onto the screen.
Can you control that?
Do you have the right knowledge? Have you measuring devices to set the various parameters?
e.g. Black level, white level, geometry, anode current at 25kV, synchronization, etc ..?
Building a VGA graphics card yourself is similarly complex.
There used to be a VGA controller, the timing components, the memory and the power amplifier drivers were mounted around this controller.
Then the software, etc.
Now it's an ASIC and the memory with power amplifier ...
Here is a little inspire, the video amplifier and the block diagram of an 17 inch RGB CRT monitor:
You can see, for that you need the x, y HV generator for the power deflection as well as the video data synchronisation.
It is not easy to build it by "do it yourself".
I wish you the best.
hi i dont know much about crt tubes at all but im looking to build a crt arcade unit but alot of crt tvs and screens i find seem to be completly useless i was hoping there might allready be an option but would there be any point in trying to create a crt driver board or the deflector circut ? (to controll the yolk and electron gun )that accepts av and rgb inputs.
hoping this isnt a fools idea