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locky_z 7th September 2009 05:37 AM

DIY Curve Tracer for PC
5 Attachment(s)
I design and make a curve tracer for computer
with software support you can measure all BJT,FET,3-termination regulator ,diode .
And show their V/I ,Vgs-Id / Hfe-Ic curve tracer on Computer

the architecture as follows

With this architecture ,I just only use a 40V power supply and cheap unipolarity AD/DA converter.

the software can measure 4 value: Ib/Ic/Vbe/Vce.You can define tracer's X/Y axis with some expression.
Example BJT's Hfe-Ic curve tracer ,you can define X axis is "Ic",Y axis is "Ic/Ib". then will show a Hfe-Ic curve .
as follows is measure 2SC3281/2N3773/2N3772/2SC3519/3DD15/DD01/2N3055/2SC2914 hfe-Ic curve
with hfe-Ic curve ,you can compare who is more linear.

from hfe-Ic curve you can exact match BJT/FET device.

as follows is measure 8 pairs 2SK1058/2SJ162 Vgs-Id curve tracer

1audio 7th September 2009 04:06 PM

Are you interested in offering a version (in english) as a kit or built? I would be interested in getting one.

locky_z 9th September 2009 04:34 AM

My english is very bad , and hard to write a english version.

cuibono 9th September 2009 04:38 AM

Wow, that looks really cool - good job!

I haven't seen any DIY data acquisition software. Maybe there is a someone around who speaks both Chinese and English?

Thanks for sharing!

taj 11th September 2009 05:25 AM


Originally Posted by locky_z (
My english is very bad , and hard to write a english version.


This is a very nice project.

Maybe I can help you translate the software and write a simple manual. My wife speaks Chinese, and many friends at work do too.

Send me a private mail here if you are interested.

Danish 7th December 2009 08:23 PM

I would be interested in building something like this. Translating the UI text from Chinese to English is a simple task. Will you offer a DIY kit?

locky_z 15th December 2009 07:39 AM

I just sell the kit only in China.

tiefbassuebertr 15th December 2009 01:18 PM


Originally Posted by locky_z (
I just sell the kit only in China.

In this case I start some weeks ago this thread
was this the motivation for you to offer this?
is it possible to get also p-Spice parameter to verify the values of manufacturers?

How expensive is your kit in china ?

Sunsun22 16th December 2009 03:02 AM

Where are you located in China. I live in Hong Kong and go to Guangzhou very often. Perhaps I can help to translate your manuel to English.

EUVL 16th December 2009 05:29 AM

The (user?) manual is easy, you have to change all his software as well so that all the manual on the computer screen appears as English. That is a lot more work.


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