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This new file fix a bug for mosfet and add a new feature in diode test: the direct current is now displayed, and two different currents are used, alternate each 2 seconds.
the artical is copy right protected so it can not be uploaded see also gulson reply in same topic, great job michel95 i have doneted you hundred points on your work
I just programmed Michel latest version into my PIC and tested it. It is working with a 16X2 display. Once again, nice work Michel - thanks! Now I have a question. I tested a 1N4148 with the following results:
.82V 9mA
.6V .6mA
on an LED, I get the following results:
2.01V 6mA
1.82V .4mA
Is the decimal point really supposed to be there when reading current at the lower test voltage?
The decimal dot is in the right position. More important is the current more important is the voltage. The first test is obtained with a limiting resistor of about 400 ohms, the second with a resistor of 6kohm, with 5V supply.
may be the "A" is the problem: the "A" version has different programming options and you must have a compatible programmer. please look at your programmer specifications, or try a model without the "A" !
Hi gyis this topic is old, but I like to ask you something.
I have 15 seconds timeout after power on (show T4001 and version)
after this 15 seconds tester runs in normal mode
is this normal ?
btw this tester is super
Just a quick note for everyone's information. I have received several emails over the past few months asking for the article or schematic for Michel's transistor tester. If you've followed this thread, then you know that the article was removed at the request of the author (Michel) in fairness to the magazine in which it was published. So, to respect Michel's request, please do not ask to have the article emailed to you - the answer will be no. However, as you will notice, Michel has been very active in supporting this thread, and I am sure that if you were to ask him, he would make the schematic available to you.
Now for some good news - Michel has not quit on the development of this project. He has continued to expand the capabilities over the original version to where this can no longer be called just a transistor tester, but more a semiconductor analyzer. The new features include:
1 - Automatic component identification of:
Bipolar transistor, with or without protection diode
Darlington transistors
Enhancement mode MOSFETs
Junction FETs
Triac
Thyristors
Diodes
2 - Automatic pinout identification for all the above components.
3 - Gain measurement for transistors.
4 - Automatic recognition of semiconductor type for bipolar transistors (Si or Ge).
5 - Gate threshold voltage for MOSFETs.
6 - Gate threshold, Saturation current and RDSon resistance for JFETs.
7 - Diode forward voltage and test current measurements.
8 - Diode leakage current measurement.
9 - Short circuit semiconductor detection and short resistance measurement.
10 - current test display for bipolar/darlington/mosfet
11 - Better accuracy for mosfet threshold and better resolution for high beta transistors
12 - Measurement of Vbe/Ib for bipolar
13 - Measurement of collector leakage current for bipolar
14 - Indication of C-E protection diode in bipolar transistors
15 - Detection of unijunction transistor with pinout and Rbb measurement
and, as if that isn't enough, he is near completion in the development of an add-on board that will allow you to test opto-couplers as well!
In discussion with Michel, he has agreed to make programmed PICs available to anyone that wishes to purchase one. Price will be 12 Euros (plus postage). If you are interested, you can email him at MWkit@aol.com. I also know that he has plans to make the semiconductor analyzer available as a kit in the near future but I will leave that to him to announce.
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