XY Pattern generator worklog

[dezbaz]

Originally Posted by Zitt

Your welcome.
The real thanks go Mr Fish - he created the original schematics years ago.
I figured it was the least I could do to share my results / corrections to my fellow community of collectors.

Excellent

[Zitt]

Oh... and time permitting; if you have questions regarding the schematics - feel free to ask here in the worklog. If I know the answer; I'll try and post it.

[dezbaz]

Originally Posted by Zitt

Oh... and time permitting; if you have questions regarding the schematics - feel free to ask here in the worklog. If I know the answer; I'll try and post it.

Cheers

So one example, in regard to U11, I see there is 11A, B, C and D, and U11PWR

So the symbols that look like an op amp operating a switch, are obviously inside U11. And the power diagram (Bottom right) is drawn to simplify things but all them ICs need +12 (or +13v) AND -4v. (EDIT: OOPS, looks like -12V) not -4

It makes more sense the longer I study the diagram actually

[Level42]

Followed this on the vectorlist with great interest. I hope someone will actually build and sell them since I sure would want one !

One question, is there no Z control or is it jsut because you hooked it up to a scope that we dont see it. I once hooked up my SW to a scope and had similar results...

[Zitt]

Originally Posted by dezbaz

Cheers

So one example, in regard to U11, I see there is 11A, B, C and D, and U11PWR

U11 is a FET switch. That symbol came from Eagle.
Not sure exactly what that fet switch does; but it's obviously tied into the opamp circuit. Looks like it turns the opamps into a unity gain opamp when "directed" by the software in the eproms.

So the symbols that look like an op amp operating a switch, are obviously inside U11. And the power diagram (Bottom right) is drawn to simplify things but all them ICs need +12 (or +13v) AND -4v. (EDIT: OOPS, looks like -12V) not -4

It makes more sense the longer I study the diagram actually

Right; opamps are powered by +/- 12V which allows for headroom to get the +/-10V on the X outputs.

Originally Posted by level42

One question, is there no Z control or is it jsut because you hooked it up to a scope that we dont see it. I once hooked up my SW to a scope and had similar results...

Correct. This scope has no Z input. Also; even my old Tek 468B didn't "darken" the retrace lines... only the "real trace" lines were controlled by the 10k sliding pot.
Should know more once I hook it to my actual Vector monitor.

[GaryMcT]

I'm following this. . .will want to build one when you are done!

[mrbill08]

Awesome effort - one thing that would make it over the top for me is if you could add a moving trace mode. I've had monitors work great with stationary vectors but if they move then the monitor has issues.

Bill

[Zitt]

This past weekend; I created a cable to connect to my G08 monitor.

Overall the generator worked like a charm - I was able to get the monitor converged.


I can't explain the center vectors... nor why the lines become squiggly. They don't move; it's always that way.


Strange that the sight pattern doesn't seem to suffer from odd vectors.

Box & Cross

[Zitt]

H Lines:


V Lines:


H&V Lines:


As you can see; the generator works well enough to converge a vector monitor... At this point I'm not sure if the odd vectors / none straight vectors are the result of a software problem (EPROM images) or a hardware problem.

It's possible the software isn't reacting well with the faster hardware (HC logic, better opamps); but unsure.

[kstillin]

Pretty neat.

Certainly it's something on the generator.
The images on the monitor look just like the ones on the scope. And I'll bet the scope can handle images a LOT faster than the G08 can do.

Kerry