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Started My Transistor Tester
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Old 28th October 2017, 02:24 AM   #1
MadInventor is offline MadInventor  United States
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Default Started My Transistor Tester

Hello,

Well winter has come early this year, so I got serious about finally constructing my semiconductor tester for BJT, Mosfets, JFets and D-Mosfets. Many projects are waiting for match sets. I have an eBay tester, but I do wonder about it, unless I really have a MJ15003 with 450 hFE. Here is a picture of the case and PCB with the old transformer I bought about a hundred years ago. I will run a few more test on the prototype pictured next to the case. Probably could of got an old heath kit off eBay for less, but where is the fun in that.

Later,
MI
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File Type: jpg sd-tester.jpg (376.2 KB, 327 views)
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Old 29th October 2017, 01:09 AM   #2
MadInventor is offline MadInventor  United States
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Can't add schematic to first post, so here it is. Probably not the last revision. The project was just an experiment, then I had some PCBs made, so here I go, will see how it works out.

MI
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File Type: pdf SD-Tester.pdf (69.7 KB, 120 views)
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Old 2nd November 2017, 03:07 AM   #3
MadInventor is offline MadInventor  United States
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Default High Power Version

Before this one is finished. I have an idea about a higher powered simplified version, maybe 4-5 A max, probably no manual sweep, too most dissipation to deal with. IXYS makes some 16A depletion mode mosfets. I have a 40 VCT 200VA toroid, +/- 28vDC. Need to figure out how to heat sink TO-3, TO-3P, TO-247, etc. with DUT quick replace/repeat ability, probably an ungrounded floating heat sink. Test only power BJT, Mosfets both vertical and lateral.

MI
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Old 2nd November 2017, 10:15 PM   #4
MadInventor is offline MadInventor  United States
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Default Found Error

I found an error, S6 lower half not needed, cut trace, now DMosfet drive will not be clamped. Changed S5 so position 1 is 100 ohms. Updated schematic.

MI
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File Type: jpg sd-tester-2.jpg (353.7 KB, 237 views)
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File Type: pdf SD-Tester_V1_R2.pdf (65.5 KB, 34 views)
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Old 9th November 2017, 04:31 PM   #5
MadInventor is offline MadInventor  United States
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Default Finished

Well, I've finished building the tester....and it works!

MI
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File Type: jpg SD-Tester-Final.jpg (317.7 KB, 192 views)
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Old 10th November 2017, 01:47 AM   #6
anatech is offline anatech  Canada
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Started My Transistor Tester
Hi MadInventor,
Can you tell us more about your invention? It appears to be a curve tracer, or is it? How do you go about using it and what do you test for?

As you should know, beta is extremely temperature dependant. You pretty much have to specify current level and case temperature along with the beta value you quote if you want to be accurate.

Anyway, enough that you created a pretty cool looking piece of equipment. How about writing a manual for it? Are you going to make the project available for others to build, or will you be selling them?

Anyway, excellent workmanship and case design from the looks of it. More pictures from front and side on? How about some pictures of the completed PCB?

-Chris
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Old 11th November 2017, 04:15 PM   #7
MadInventor is offline MadInventor  United States
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Quote:
Originally Posted by anatech View Post
Can you tell us more about your invention? It appears to be a curve tracer, or is it? How do you go about using it and what do you test for?
Yes and no. I can run it in XY mode on scope, but not what I intended, below is a image of a 2SK1058, set for 100mA drain current(blue) and Vgs (yellow) range set by cursors. I was looking more for a solution to IPS current points, forward voltages, OPS bias current, depletion mosfet CCS and obviously matching. I did include base/collector current test points for beta calculations. If I did it over I would have four base resistors (10, 100, 1K, 10K). Tester can be ran in sweep or manual, sweep for sorting and manual for more accurate measurements.

Quote:
Originally Posted by anatech View Post
As you should know, beta is extremely temperature dependant. You pretty much have to specify current level and case temperature along with the beta value you quote if you want to be accurate.
The DUT Power switch was changed to up - leave on, cover over device, with temperature readings, center - off, down - on momentary - read quickly, device at "room temperature".

Quote:
Originally Posted by anatech View Post
Anyway, enough that you created a pretty cool looking piece of equipment. How about writing a manual for it? Are you going to make the project available for others to build, or will you be selling them?
No, I won't be selling the tester, if anyone wants to build one, they can. I have extra PCBs if anyone is interested, but they were made for a transformer I have had for along time. Different ones could be mounted in place of the one I used, 36VAC CT(2 x 18) @500mA or more.

Quote:
Originally Posted by anatech View Post
Anyway, excellent workmanship and case design from the looks of it. More pictures from front and side on? How about some pictures of the completed PCB?
Thanks for the kind words!
The panel was made by Front Panel Express. The case is a BUD box. I marked some holes wrong for the push buttons, had to elongate them. I might add more pictures later.

Thanks,
MI
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File Type: jpg 2SK1058-M.jpg (54.9 KB, 132 views)
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Old 11th November 2017, 09:07 PM   #8
SyncTronX is offline SyncTronX  United States
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Started My Transistor Tester
It's good stuff MI, that we could use also.

Thanks for making and sharing it.

So I take it the boards are for the original and not
the V1 R2 version of it?

I'd be interested in the boards and additional pics.
Looks like a good project and useful too.

How much better is V1 R2, as the Mosfet drive is not unclamped?

That is better for? Ok, got it. If clamped, then you can't work
the mosfet as "hard" so how would you test the higher current points?
Hence, non-clamped.

cheers,
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Last edited by SyncTronX; 11th November 2017 at 09:18 PM.
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Old 11th November 2017, 11:11 PM   #9
nigelwright7557 is offline nigelwright7557  United Kingdom
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Its hard to get all the functionality into one system.
I have one tester that detects BCE and measures hfe etc.
I have another tester which tests for breakdown voltage.
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Old 12th November 2017, 12:42 AM   #10
MadInventor is offline MadInventor  United States
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Default SD-Tester

Quote:
Originally Posted by SyncTronX View Post
It's good stuff MI, that we could use also.

Thanks for making and sharing it.

So I take it the boards are for the original and not
the V1 R2 version of it?

I'd be interested in the boards and additional pics.
Looks like a good project and useful too.

How much better is V1 R2, as the Mosfet drive is not unclamped?

That is better for? Ok, got it. If clamped, then you can't work
the mosfet as "hard" so how would you test the higher current points?
Hence, non-clamped.

cheers,
You're welcome, the pcbs have one trace that needs to be cut. This allows depletion mode mosfet gates to be driven to 8 volts(Vgs) which is max., bjt and jfets are clamped at 1.2 volts. The pushbuttons set up the devices for drive polarity. So that everyone knows, these boards contain lead, I got them from PCBway and forgot to check HASL lead free, my mistake. Here are some more images, the scope trace is a MPS8099 where collector current is set at 1.6 mA and matching Vf between cursors, for my Leach amp.

MI
Attached Images
File Type: jpg SD-Tester-4.jpg (177.1 KB, 86 views)
File Type: jpg SD-Tester-5.jpg (252.7 KB, 37 views)
File Type: jpg SD-Tester-7.jpg (329.8 KB, 42 views)
File Type: jpg MPS8099.jpg (52.1 KB, 39 views)
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