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Show Us Your Curve Tracer
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Electro Fan:

--- Quote from: Calambres on March 10, 2021, 10:46:59 am ---I made one based upon the infamous "Thai Kit" (https://www.ebay.com/itm/141138017533).
Already talked about it some time ago in this very forum.



This kit is also heavily based upon an ELEKTOR magazine article (Dic. 1989). I made a small modification to the kit to let it switch between 8 and 4 curves and subsequently the total µA/mA. This is a photo of the guts while I was still prototyping it:




It needs a good ole CRO (preferred) with XY mode to show the curves.



The most interesting feature of my build is that it can compare (match) up to 6 transistors/FETs at the same time at the flip of a rotary switch. Here you can see it in action testing some transistors, first with four small transistors (2SC1815) and one power transistor:



The second is showing the details of four small transistor (2SC1815) curves:



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Really nice post and congrats on your curve tracer.  I was going to ask how you did this:
"The most interesting feature of my build is that it can compare (match) up to 6 transistors/FETs at the same time at the flip of a rotary switch" but then I saw your link which explains your approach as you steadily worked it all out.  Your posts in that the thread and the whole thread had a lot of good info so I edited one of the posts at the front of this thread to make it easy to find the thread.
Calambres:
If someone is interested, I have a pdf of the original ELEKTOR article the Thai kit is based upon. Not that it is very diffiult to find but if someone wants it without much hassle, drop me a note.
edavid:

--- Quote from: Electro Fan on March 10, 2021, 06:18:35 pm ---
--- Quote from: Ground_Loop on March 10, 2021, 02:03:12 pm ---This is my vintage Heathkit. It has served me well. The one thing I would change about it is the single ended sweep to bipolar. It does sweep positive and negative, but not continuously. You need change the control settings to sweep the opposite direction. I gave some thought to modifying it, but gave up after realizing I would need to hack on the enclosure to accomplish it.

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That's a nice combination of curve tracer and oscilloscope.  Definitely good idea to retain their vintage dignity.   :-+

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I disagree - I would never connect a curve tracer to an MCP scope like the Tek 2467B  |O
Electro Fan:

--- Quote from: edavid on March 10, 2021, 07:54:35 pm ---
--- Quote from: Electro Fan on March 10, 2021, 06:18:35 pm ---
--- Quote from: Ground_Loop on March 10, 2021, 02:03:12 pm ---This is my vintage Heathkit. It has served me well. The one thing I would change about it is the single ended sweep to bipolar. It does sweep positive and negative, but not continuously. You need change the control settings to sweep the opposite direction. I gave some thought to modifying it, but gave up after realizing I would need to hack on the enclosure to accomplish it.

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--- End quote ---

That's a nice combination of curve tracer and oscilloscope.  Definitely good idea to retain their vintage dignity.   :-+

--- End quote ---

I disagree - I would never connect a curve tracer to an MCP scope like the Tek 2467B  |O

--- End quote ---

Your concern is using up the useful life on the MCP or something else?  (I'm guessing Ground_Loop doesn't trace curves all day every day, and his MCP likely has it's timeout feature operating.)
Ground_Loop:
I also have 7 scopes on my bench and a 555 in the corner.   On the rare occasion that I use the curve tracer I usually go to the 67 because i have a preset for the curve tracer.  And the timeout works just fine.
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