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Loadlines and Microsoft Paint
Loadlines and Microsoft Paint
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Old 28th February 2013, 11:20 PM   #1
mr2racer is offline mr2racer  United States
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Default Loadlines and Microsoft Paint

Hey All,

This may be painfully obvious to most tech heads here but its kinda cool, (I think so.) and might be helpful to others. Rather than photocopy a load line graph and use a ruler and pencil, use paint. Its that usually overlooked drawing program in Windows accessories. Do an image search for a loadline graph. My example is a 6GK5. Save it as an image file. Then you can draw as many lines as you like. Screw up? Just exit the file and open your original and start over. No more wearing out erasers on your pencils.

Also, if you find an image of a schematic, download it and save as an image file. Then you can edit it and redesign it as much as you like. You can cut and paste symbols for valves and parts from other schematics.

I'm sure there is some kind of CAD program out there that does this, probably even better. But this is FREE! I hope this helps.
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File Type: jpg Loadline Example.JPG (74.6 KB, 186 views)
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Old 28th February 2013, 11:47 PM   #2
Richard Ellis is offline Richard Ellis  Argentina
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Default Drawings

I use it all the time! Perhaps it is a little slower than other programs with "preset" symbols and such but I can crank out a drawing just fine when words just won't do.

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File Type: jpg 813 50K.JPG (45.1 KB, 176 views)
File Type: jpg AC.JPG (22.7 KB, 171 views)
File Type: jpg Ground star.JPG (30.5 KB, 170 views)
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Old 1st March 2013, 10:55 AM   #3
DF96 is offline DF96  England
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Yes, I use Paint for doing simple drawing. The nice thing about it is that it is so crude that it never tries to second-guess what I am trying to do. I hate smart software! (Especially Microsoft smart software). I have used proper drawing programs (such as Autocad) and find that only the really expensive ones (which I can't afford for home use) are any good; cheaper ones are always buggy.

One snag I have found: as usual for MS, different versions have different parameters/defaults. For a long time I was using an old Win Me laptop. When moving to XP I found that Paint used a different assumption about pixels per inch. Somewhere deep in the psyche of Microsoft there is an irrational fear of version compatibility - it could even be that it is company policy to deliberately annoy their users every few years.
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Old 1st March 2013, 08:26 PM   #4
Miles Prower is offline Miles Prower  United States
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I use the GIMP (I run Linux) for that.

Click the image to open in full size.

I also find it helpful to color code the various loadlines. Red for the DC loadline, blue for AC loadlines where there is enough difference to make a difference, and green for determining gm and u-factor.
There are no foxes in atheistholes
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Old 1st March 2013, 09:51 PM   #5
trobbins is offline trobbins  Australia
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I just use the Drawing Canvas in MS WORD - as WORD is where I put all my design info so don't have to change application whilst juggling words and loadlines, and I can copy and paste the canvas' in to other Word docs for different amps. I just grab and crop the appropriate graph from the datasheet (either save the pdf as a tiff in Acrobat, and then use paint to change to gif - or do a screengrab in to paint).
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Old 1st March 2013, 09:53 PM   #6
JonSnell Electronic is online now JonSnell Electronic  United Kingdom
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I use the drawing programme in Open Office within Linux. It is all freeware and not lining Gates' pocket!
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Old 1st March 2013, 09:53 PM   #7
scott17 is offline scott17
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This free service can be used to convert pdf files to many different formats:
Zamzar - convert document, eBook, image, audio and video - free online file conversion
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Old 1st March 2013, 11:30 PM   #8
wicked1 is offline wicked1  United States
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I use paint too. I've got a windows tablet and can use a ruler and pen right on the screen.. it's great!
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Old 2nd March 2013, 12:33 AM   #9
jcx is offline jcx  United States
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I've only been playing with (free) GeoGebra for a few days but it looks good for this


requires Java - you did update to the 7 security fix release, remove old versions - right?

GeoGebra is a plane geometry tool but can also import, manipulate graphics

you can set object colors, transparancy to layer your added eyball fit lines, axis projection, quadratics on top of the datasheet graphic

if you scale, rotate imported load line graphics object to the drawing reference axis your added points, lines, coordinates, conics equations show in a sidebar, update "live" as you drag the points, or add slider buttons for formula defintions that get drawn "live" - and would be easily translated to electrical units

Tutorial:Transformations & Inserting Pictures into the Graphics View - GeoGebraWiki

Last edited by jcx; 2nd March 2013 at 12:52 AM.
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Old 2nd March 2013, 12:49 AM   #10
brucetassin is offline brucetassin  United States
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I use MS PAINT to make PC boards.
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