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Old 10th April 2010, 01:24 AM   #11
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No, I live in the US.
I will look into the 576.

Do you have PCB of a curve tracer? What curve tracer are you talking about?

AX = Audio Express?
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Old 10th April 2010, 02:11 AM   #12
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Heathkit made a curve tracer, the IT-1121, frequently seen on Ebay. Goes up to 1 amp and switches easily between two devices for matching.

mods.dk / picture / Heathkit / it-1121
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Old 10th April 2010, 03:06 AM   #13
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what is the typical price for the tracer?
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Old 11th April 2010, 05:02 AM   #14
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Don't recall, but it should be well under $100. Just keep scanning Ebay until one pops up.
(None right now, try scanning for curve tracers in general)
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Old 11th April 2010, 02:21 PM   #15
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is it a good curve tracer? I mean why would it only cost $100? is a tecktronix curve tracer's plug in a better fit for matching devices?
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Old 11th April 2010, 05:45 PM   #16
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Quote:
Originally Posted by Stefanoo View Post
is it a good curve tracer? I mean why would it only cost $100? is a tecktronix curve tracer's plug in a better fit for matching devices?
I had one of the heath units a long time ago -- easy to get manuals for them. There are similar tracers from Eico, Sencore and B&K of that vintage.

The 7CT1N is for low power devices, although you can pull up to 160mA. If you're going to pull any appreciable current -- say over a few hundred mA -- make sure to heat sink the DUT. You can find the manual here: http://bama.edebris.com/manuals/tek/7ct1n/

The 576 makes matching bipolars easy since there's a switch right on the fixture box. If you get a 576 you might wind up having to make some of your own test fixtures with banana plugs and perf-board.
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Old 16th April 2010, 12:05 AM   #17
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An IT-3121 has shown up on Ebay for about $50; mostly a cosmetic update of the IT-1121, I think. You'll need an oscilloscope of course, a dual trace would be best. Probably not as precise as the Tektronix units, but surely much more affordable.

I never did figure out how to get mine to work with MOSFETs. Anyone got suggestions? Haven't fired it up in years; time to blow the dust off and check out the calibration.
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Old 16th April 2010, 12:10 AM   #18
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Hi,

I got one IT-1121 two days ago. I paid $115.
It looks like it works and it is cosmetically in good condition.

I have just one thing to ask to the users of this curve tracer:

why do I see loop on every trace and even when I try to compensate with the trimmer in the rear panel?
I mean...I can manage to reduce the loop by lowering voltage, change scale...but still I can't get a super clean trace like in the manual.
Is it normal? if not, how can I fix it?

Plus...I have tried t trace the curve for te 2SC2240 (NPN), respected pin-out, but nothing shows, so I thought t was broken and I opened it up checked it and everything looked fine, so finally I put a BD139 instead and...boom....tracer works...and then I tried with the 2SK170 and works too...so...I still kinda of trying to understand how it works.

If anybody here could share the experience it would be nice.
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Old 16th April 2010, 02:36 AM   #19
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Get a manual from www.w7fg.com
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Old 16th April 2010, 03:59 AM   #20
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I do have a manual.
Explains how to mount it, test it and so on.

I read it almost all.
It doesn't explain how to fix this problem so I assume that it is normal as it does mention that this is thermal runaway and it can be done a little by the curve tracer itself.
That is why I am asking to the users of this curve tracer if they have the same thing and if they got around that and how in case.
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