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Old 7th April 2013, 10:17 AM   #371
alazira is offline alazira  United States
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Originally Posted by NicMac View Post
In my hands the in silico matching is very reliable.
Try this equation:
Id (deg) = Id/(1 + Rdeg*Yfs)
Well, I'm not saying it isn't reliable.
SJ74 Yfs = 0.034950732
theoretical Yfs(3.3deg) = 0.031336465
theoretical Id (3.3deg) = 7.584071234
Measured Yfs(3.3deg) = 0.030164501
Measured Id (3.3deg) = 7.6318326

As you can see, quite close. If you rounded Id to tenths they would both be 7.6mA.
However, the measured Yfs is predicted by 4.5ohm degen vs the 3.3ohm actual.
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Old 30th April 2013, 04:14 PM   #372
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Hi all,

I was looking into buying one of this for my projects.
Where is a good place to buy it? ebay?

Is the software in chinese or there is an eglish version as well? Is this device proven to be reliable?

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Old 30th April 2013, 04:38 PM   #373
The Dastardly Dad of Three
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Bot mine off eBay - works like a charm so far

Manual is rudimentary but learning to use it is easy.

Really cool tool!

If you need help many on these lists can chime in. I use it for mosfets and jfets so can't say much about BJTs....
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Old 30th April 2013, 08:29 PM   #374
RCruz is offline RCruz  Switzerland
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Must have this
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Old 30th April 2013, 09:51 PM   #375
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thanks guys!
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Old 1st May 2013, 08:26 AM   #376
NicMac is offline NicMac  Italy
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Take the cased version from e-bay. The tracer is very reliable and accurate. Simple mods can improve it current capability.
Last but not least: the maker is a very smart and helpful guy (even if his english could improve)
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Old 1st May 2013, 04:18 PM   #377
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thanks for your advice.
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Old 3rd May 2013, 10:21 PM   #378
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Hi all:
I see the product is $229 USD on Ebay. Is there a kit version for less $$$?
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Old 4th May 2013, 12:26 AM   #379
locky_z is offline locky_z  China
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Not complete version is no longer available.
Only sell with the case and power supply version.
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Old 23rd May 2013, 02:18 PM   #380
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Hi Locky,

I was a very happy user, but the tracer has a serious problem after testing a faulty transistor which has E-C shorted. Sometimes it works normal for 5 tests, but then all next test : one or more relays are clicking very fast open-close-open-close... and the Hfe curve goes to 2000 or 10000 and Ib to 10000 mA or more.

In attached pictures, measurements are being stopped (purple lines), or very strange results.

Relay J1 and J2 are getting warm/hot after 30 minutes

What can be wrong ?

edit, attached curves are 2SC2235 transistor tests (Imax = 750 mA, Vbe=2V, Rb=6K, Rc=4.55, 10x AD sample)
unit #109
Attached Images
File Type: jpg Trace1.jpg (148.6 KB, 239 views)
File Type: jpg Clipboard00.jpg (179.2 KB, 379 views)

Last edited by AmpliFire; 23rd May 2013 at 02:22 PM.
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