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Revisiting some "old" ideas from 1970's - IPS, OPS
Revisiting some "old" ideas from 1970's - IPS, OPS
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Old 7th August 2015, 11:18 PM   #121
still4given is offline still4given  United States
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Revisiting some "old" ideas from 1970's - IPS, OPS
Bad news, my scope gave up the ghost. Not sure I can be much help now. There will be no way to verify anything without it. Looks like I have a big investment to make.
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Old 7th August 2015, 11:21 PM   #122
jwilhelm is offline jwilhelm  Canada
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Originally Posted by still4given View Post
Bad news, my scope gave up the ghost. Not sure I can be much help now. There will be no way to verify anything without it. Looks like I have a big investment to make.
What's wrong with your scope? Scope repairs might be a cool project.
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Old 7th August 2015, 11:42 PM   #123
still4given is offline still4given  United States
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Revisiting some "old" ideas from 1970's - IPS, OPS
The traces are super thick.
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Old 7th August 2015, 11:53 PM   #124
jwilhelm is offline jwilhelm  Canada
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The CRT and Flyback aren't screwed then. Drain the high voltage to the CRT and look for crispy parts or leaky caps first. There are quite a few people here that can help with this. I'm in the middle of repairing an old Daytona arcade game CRT display. Neat old technology!
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Old 8th August 2015, 12:16 AM   #125
didiet78 is offline didiet78  Indonesia
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Originally Posted by still4given View Post
The traces are super thick.
Have you try to adjust Focus ?
I hope it just cold solder of trimpot or leaky Capacitor
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Old 8th August 2015, 12:23 AM   #126
still4given is offline still4given  United States
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Revisiting some "old" ideas from 1970's - IPS, OPS
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Originally Posted by jwilhelm View Post
The CRT and Flyback aren't screwed then. Drain the high voltage to the CRT and look for crispy parts or leaky caps first. There are quite a few people here that can help with this. I'm in the middle of repairing an old Daytona arcade game CRT display. Neat old technology!
Did I say ghost? All of a sudden it is working properly again out of nowhere.

Maybe I can get a little more work done. It is probably time to invest in a digital scope. Fixed income now so I will have to save for it.

Quote:
Hi Terry,

In fact, the variant you've got now (with C13 installed) is excellent - I've checked it in a number of simulations.

Can you please try C11, say, 1pf - if you've got the value that small - leaving all the rest just as is?

If it runs well, you can try to reduce C13 from 22p to 15p. This is going to give the sharpest corners.

Then we select the best option for compensation caps.

As a final touch, you can change the resistors for the best balance of the circuit:
R22 = R23 = 100
R8 = 220
So I'm clear. I don't make the other changes from post #111? Leave C13 in and C12 out?
The smallest cap I have is 2p.

Last edited by still4given; 8th August 2015 at 12:25 AM.
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Old 8th August 2015, 12:35 AM   #127
still4given is offline still4given  United States
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Revisiting some "old" ideas from 1970's - IPS, OPS
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Originally Posted by didiet78 View Post
Have you try to adjust Focus ?
I hope it just cold solder of trimpot or leaky Capacitor
Yes I tried everything. It just kept getting worse. At one point the trace just dissappeared and I had to press the trace finder button just to see something. I left it running for a couple hours and when I came back it was sort of working but with thick traces. Now it looks normal again. Weird. I remember a couple of years ago it quit working and I tried to get the case apart and had no luck. Note of interest. When the traces were thick it was only thick vertically. The vertical lines were thin and the horizontal traces were thick. Well it's working right now so I will keep my fingers crossed it will continue until I can afford a new one.

Blessings, Terry
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Old 8th August 2015, 02:02 AM   #128
still4given is offline still4given  United States
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Revisiting some "old" ideas from 1970's - IPS, OPS
Hi Valery,

I left everything as I had it. I had some 3p3 caps so I put three together in series and installed them in C11. It didn't really change anything. Looks the same as before.
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Old 8th August 2015, 02:58 AM   #129
vzaichenko is offline vzaichenko  Russian Federation
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Revisiting some "old" ideas from 1970's - IPS, OPS
OK, cool. Let's keep the smallest value there as C11 (1p - 2.2p) just to be on a safe side on terms of stability. All the rest is fine.

Hope the scope will get better. Vital part of the lab for sure
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Old 8th August 2015, 08:31 AM   #130
still4given is offline still4given  United States
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Revisiting some "old" ideas from 1970's - IPS, OPS
So to be clear, C12 is out and C13 is in? I will try reducing C13 to 15P and see if that changes anything. I will also reduce R22=R23=100R and see if I can use 220R for R8 and see if I can get rid of the piggy backed resistor.

Blessings, Terry

Edit; I forgot to ask. Did you notice that the negative shoulder is weaker that the positive?
Also, your last schematic you added C5 back in. I don't have that. Do you want that there?

Last edited by still4given; 8th August 2015 at 08:36 AM.
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