Frame Sequential Cathode Ray Tube Project

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Frame Sequential Cathode Ray Tube Project

Postby Harry Dalek » Tue Jul 10, 2018 12:06 am

Been looking for a while for a small Colour CRT to experiment with for my first venture into Colour television and came across part of a vintage fish finder JFV-61 which happened to have a a Colour tube,the small ones are pretty rare now unlike the odd B/w type you can still get now and again but Colour not so easy to find these days.
It is a Sony tube have no data again for this CRT so will have see if i can to work it out and if i am lucky so a frame sequential tv it will become .
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Just happens to be mounted vertical which is just right to display Gary's vertical line scan 32 line frame sequential system on video2nbtv v3....be nice flashy at 12.5 hz :wink:
Here below is unwanted beast in all its grubby glory and its cleaner insides which will be gutted soon .
i will keep the case clean it up .
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The electromagnetic spectrum has no theoretical limit at either end. If all the mass/energy in the Universe is considered a 'limit', then that would be the only real theoretical limit to the maximum frequency attainable.
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Re: Frame Sequential Cathode Ray Tube Project

Postby smeezekitty » Wed Jul 11, 2018 11:17 am

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Re: Frame Sequential Cathode Ray Tube Project

Postby Harry Dalek » Wed Jul 11, 2018 5:58 pm

smeezekitty wrote:http://www.commitstrip.com/wp-content/uploads/2014/11/Strip-Side-project-650-finalenglish.jpg

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I am getting better at that i have had many failed projects when i started on the forum but slowly picked up knowledge from my friends here on the forum .
I finished a electrostatic monitor a multi system PMT flying spot camera multi system magnetic deflection monitor and a Vidicon camera to working proof of concept or more ,last one i am stuck with a wrong deflection yoke so as far as i can go with that at the moment all 4 projects took me 1 year .
To go on more with any project could be endless but comes down to interest and interest of others no replies how long can you talk to your self ?,you may notice most posts just stop on the forum on subjects so pretty much same go's for that project .
i have swapped to all electronic projects for a while to learn how to do it all this and tick off my to do list /

Now onto this one !
Gutted the the old fish finder well its a start ...and i have to get the CRT out to work out what go's where on its insides ,last time i did a search could not find any data on this there's very little on magnetic deflected CRT newer types .this ones may be 80's 90s guessing .
I don't really want to take the yoke and magnetic rings off the tube but looks like i will have to due to the lack of data .
I think i know enough to work it all out i have a good idea how it will all work circuit wise ,got the the parts the other day .
This fish finder i have had for some time and again have been thinking about how to use the colour tube and my limitations and Frame Sequential it will be .
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The electromagnetic spectrum has no theoretical limit at either end. If all the mass/energy in the Universe is considered a 'limit', then that would be the only real theoretical limit to the maximum frequency attainable.
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Studying the Trinitron

Postby Harry Dalek » Thu Jul 12, 2018 7:32 pm

I am heading out in uncharted waters and i could sink , i am looking into the difference's on B/w and the Sony's invention colour Trinitron tube..
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The main difference is the internal Resistors some sort of feed back happening to the EHT transformer focusing help ..

More speculation in the video below on the trinitron electron gun and these resistors .
So as far as focusing go's i will sure find out soon ,i will hook the tubes deflection coils up to a small AC voltage and fire it up ...any case i don't need it to be to fine as its 32 line i want it on.
https://www.youtube.com/watch?v=90eBdNq-ZM8
Below my first look at the tubes pin connections
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The electromagnetic spectrum has no theoretical limit at either end. If all the mass/energy in the Universe is considered a 'limit', then that would be the only real theoretical limit to the maximum frequency attainable.
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Harry Dalek
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EHT and measurements

Postby Harry Dalek » Sat Jul 14, 2018 6:49 pm

One problem i have over the last SSTV P7 and B/W NBTV magnetic deflected tube is EHT i have run out of Chinese bug zapper modules and this colour tube will need something a touch higher.
I did manage to have a look at the spark distance of the colour tubes EHT but it died before i could get my High voltage probe and better meter onit to take a correct reading .
Looked to be in the teens for a 1mm per 1000 volt spark .
Since then i have knocked up a replacement which i was going to do any case ,didn't use this crt's flyback transformer but used another i scrapped from another colour portable tv from a few years back ...its CRT is long gone which i regret all getting harder to find these days .
Below the ZVS flyback driver ,pretty much fool proof this fool as made 3 and they always work first go .
Mazzilli ZVS Flyback Driver.jpg

Now on to testing the voltage .
I had to check my meter and probe testing my PMT power supply on one of its settings just to make sure i remembered how this works ....i picked the PMT power supplies negative 1280 volts raw to the meter first up,then via the Probe and meter which shows 12.8 on the Low probe setting and 6.4 on the high (have to double the number on high setting).
Ok that went fine on to the ZVS flyback ...
Raw reading direct to my good high voltage meter its low voltage is a touch over 1.200 volts and high 12.050 volts via the probe working it out ....well so far , i have double the winding's on the primary coils i need to cut back and see if i can tweak it a touch higher

Below low EHT reading as the flyback driver starts to work. Notice reading is direct to meter .

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The highest reading it can do at the moment via a probe reading is 12.050 volts just add a zero via a probe reading

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low spark test ...not really good to do this all it doe's is heat your parts up to fail as i found out the hard way on this monitors original EHT circuit...i recall the 555 flyback circuits will kill them very quickly .
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Placement ...a pain if you make something and it doesn't fit a lesson learnt ! :roll:
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The electromagnetic spectrum has no theoretical limit at either end. If all the mass/energy in the Universe is considered a 'limit', then that would be the only real theoretical limit to the maximum frequency attainable.
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Harry Dalek
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Firing up the Trinitron

Postby Harry Dalek » Sun Jul 15, 2018 2:33 pm

I did the same experiment i first did on the Thylacine CRT but first having a good look at the CRT with no data just studying the cathode ray tube and jotting down what you think is what .
First up hooked the heater up to 5 volts dc (should be 6.3v) EHT plugged in and cathode to ground or in this case 3 one at a time and 6v AC on one of the deflection yoke coils.
First time i have ever got one of these to light up ,i tried the other deflection coil for the rest of the experiment .
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Next i tried the 3 guns on their own and not what i was expecting !
I was expecting just one colour per gun ...i think due to not having any focus voltage on the anode yet the beam is defocusing crossing the other guns path's
speculating of cause.... :?:
I think the next step would be working more on the CRT supply and see if i can get lines of just red blue and green in a better focus .
But least i know at the moment the EHT is good enough to test with .

Blue gun i think
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Green Gun
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Red Gun
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Taming the beast
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The electromagnetic spectrum has no theoretical limit at either end. If all the mass/energy in the Universe is considered a 'limit', then that would be the only real theoretical limit to the maximum frequency attainable.
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Harry Dalek
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The Trinitron and thinking about the circuits

Postby Harry Dalek » Tue Jul 17, 2018 6:40 pm

This gives me more of an idea what going on in the Triniton , the manual is a good find very helpful.
Sony CTV25 BA-4 Training Manual.PDF
(3.14 MiB) Not downloaded yet

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I have not explained what i am up to circuit wise if i manage to get the CRT to behave ...Pretty much every thing i will use i have used before so i know the circuits will work /
Again i will be using Steve Andersons DAC circuit pretty much my favourite circuit these days ...any way using a 3.2768MHZ and a 6 MHZ crystal clock selectable.
Sync pulse from video will be used to reset the Master clock resets on the 4040's where there is a pulse to use !
For the colour video signal using Garys video2NBTV -v3 where there are three 3 frame sequential systems to try and i will decode the video .
The 3.2 MHZ is for the colour 32 line frame sequential 102.4khz divided by 3.2khz 32 line these frequencies into the 4040 counts and out .
The 6 Mhz crystal clock via a 3 divide by 10 and divide 2 counter to get the 3 khz 120 line colour frame sequential system line frequency and then a divide by 8 to get 375hz line frequency for the 30 line Baird frame sequential ...any way its do able with parts handy .
I will use the frame pulse to control a 4017 set up to count to 3 and reset to switch the 3 colour frame video signals via 3 4066 switch's /
if all that's makes sense ...i think even with no sync pulses via the 120 line system with just the crystal clock if adjusted close should at least be viewable even with a slow drift ,in B/w it was on the Devil A for Andrew monitor even with a R/C oscillator .
May be if i am lucky i will get some thing like this on the monitor
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The electromagnetic spectrum has no theoretical limit at either end. If all the mass/energy in the Universe is considered a 'limit', then that would be the only real theoretical limit to the maximum frequency attainable.
User avatar
Harry Dalek
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Ac Power supply

Postby Harry Dalek » Sat Jul 21, 2018 7:15 pm

Bit of head scratching last few days mainly thinking about the power supply and how to feed it to the monitor ,due to lack of space and putting a mains transformer to close to a crt is not a good idea as well , so have gone for a separate case monitor feeding the monitor its AC supply via its 9 multicore Cable in a similar way to the Anderson 3bp1,the Deep image P9 SSTV and the The Devil A for Andrew monitors ,but difference is its using i am making its own supply touch smaller than the heavy bench supply i made for the past monitors,
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The Dc supply for the circuit will be on the top PCB.
The electromagnetic spectrum has no theoretical limit at either end. If all the mass/energy in the Universe is considered a 'limit', then that would be the only real theoretical limit to the maximum frequency attainable.
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Harry Dalek
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Part of the clock circuit

Postby Harry Dalek » Mon Jul 23, 2018 12:05 am

I worked on another part of the monitor today to see if the math's work out in practice,Looking here at getting the 30 line and just really need 30 Line 120 Line for the colour part of this project the 32 line is done via a 3.2768MHZ crystal oscillator and another 4040 , but on this one to get to those line rates just so happens if you do it this way you get 240 line 120 line 60 line 30 line using either 12.5 hz or 25 Hz and that's got via the other 3.2MHZ crystal oscillator .
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The electromagnetic spectrum has no theoretical limit at either end. If all the mass/energy in the Universe is considered a 'limit', then that would be the only real theoretical limit to the maximum frequency attainable.
User avatar
Harry Dalek
"Fester! Don't do that to 'Thing'"
 
Posts: 3751
Joined: Fri Sep 26, 2008 4:58 pm
Location: Australia


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