The schematic diagram on the video is the reference diagram for current boost regulator from the motorola 7812 datasheet. The more 12 Ohm resistors you add in parallel, the less total resistance as an output load and thus the current draw rises. I'm not sure though that, this way is the best for testing switching mosfets.
I think it is great that the seller wrote "fake" right on the package. It really saves you time. You can throw them straight into the garbage. I have some 2n3055s with the tiniest die you have ever seen. I don't think you can buy genuine power transistors on eBay or Aliexpress. If you are only switching an amp or two they will probably be just fine. Great test rig by the way.
Hi Leif: Thank you for putting the video, this may help many unsuspecting people who buy from companies in China where components are recovered and resold as new. This I have suffered with Utsource that sells fake components and in most cases their shipments are delayed up to 2 months, honestly this although it does not seem very serious, but many of us do not give importance. Regards.
Three FLUKE METERS NOT Three Fukes You have to learn to pay attention to detail and learn how to write correct grammatical legal English. Your writing skill is below acceptable standard for you age unless you are age 8 Learn that CORPORATE legal names are ALWAYS in ALL CAPS It is even clearly written on the meter Because you were programmed to be a ZOMBIE - you do not notice ZOMBIES have eyes but cannot see - ears and cannot hear Understand that you are not a serious or qualified writer. Undertake an extensive reading program to educate yourself first
This problem gets worse and worse also with most of ebay sellers, esp. from china. You can be nearly 100% sure you get fake if you order cheap mosfet, igbt or other transistor and even most ICs are counterfeits. Other methods of testing is measuring the Rdson (Drain-Source-Resistance when on under Load) and measure the drop voltage and divide by the current to get resistance. In most cases it is 2-5 times higher than specification in datasheet. Also the gate capacitance with fake mosfets will normally be lower due to smaller die and less micro-transistors on the die. I just bought fake IRFP4768 and IRFP4668 from China - was hoping for good but obviously fake. So you have to buy from local trustworthy suppliers ;-)
Hi, thank you very much. Good, informative video. I have to test some power devices pretty shortly and will use my DC electronic load instead of resistors, a little more flexible. Thank you very much!
For the NPN transistor I use 7912,, but you can use it but if you redesign it, you just need a reference voltage to Get the transistor to give out approx 12 V, 12 volt was ok for me since I have a lot of 12 Ohm resistors and 32v power supply, that give me 20 V over the test transistor, ANg again give me power loss of 20w with 1A, 40w with 2A and so on .
Almost all transistors I've bought from China (AliExpress / Alibaba / eBay) are fake. Even "recovered" items are sometimes re-labeled (but is off course not the same part and certainly does not have the same characteristics).
I done dumped out 300 hundred dollars trying to make a voltage booster on transistors they keep blowing I think cause they can't handle a 20% of there amps on data sheet.have not checked the gate voltage to see full turn on turn off but I tried diffrent transitors and some held at about 65% amp rating if not more they were awezeicc transistors .going to try order from digikey or mouser now and see what happens
Tank you for this informativo video!!!!!Fake semiconductors are very comon in low price supliers!!!!! Do you like good and trust components?FARNELL It is not cheap price but is very good quality!!!!!
Hi, I have make a better Circuit now that can test all transistor npn, pnp, mosfet and darlington, planing to make a new Video about that :) The Circuit at video are not 100% stabil for all transistors I discover that after I make this video.
Do you have a schematic for your new test circuit - I have purchased a lot of transistors from Ebay and have been trying to find a way to test them before putting them in the actual circuit.
I got a strange idea for a bad fake one, get a high voltage transformer and plug it in the wall and put the output of the transformer on the transistor and make a single use fire starter XD. (!WARNING! DO OUTSIDE, HIGH RISK OF FIRE!) don’t forget to record it.
Hi, the problem is that it Is so many sellers that sell fake stuff, It is actually hard to find someone that sell real stuff, and I have buy a lot before I found out it all was fake, both from Ebay and Alix, I did report it but nothing happend, Some sellers have pitures of the original but send fake.
For a non-destructive test, saturate the MOSFET, and measure the Rds On. If you apply 1 amp across the drain-source junction, measuring the voltage across those terminals with the gate-source junction supplied with the specified voltage, you can compare your readings with the rating listed in the Datasheet, and tell if the transistor under test meets specifications for that type number. (at 1 amp, the voltage across the drain-source pins is exactly proportionate to Ohms) If the on-state resistance is higher, it's a fake. If the resistance is close to rated on-state resistance, then, it's worth the SOA (Safe Operating Area) testing. The devices you have in this video might be mislabeled IRF9510, with an Rds On of ~1.2 Ohms. It's only rated to dissipate 20 watts, which guarantees, that it will fail this test. The Rds On test would reveal the high on-state resistance, which would immediately disqualify it.
Rds ON not Rds On You have not yet learned the difference between ON / OFF ( and ) on / off They sound the same but they are not the same and are used in a different context. When you are referring to switching it is always ON / OFF written in the ALL CAPS It is even written on switches but you are blind to see it because you are not trained to pay attention to detail. Your eyes see one thing and your brain sees something entirely different. Your School programmed you to be a ZOMBIE So learn this and teach it to the ZOMBIES - EARN YOUR TEACHERS MEDAL
You need do claim and money back. I am very happy that you if repair some stuff from a 747 you check it 12 times ! it's a scam but you pay less for it. That way it stays that cheap, expensive is and the end.
![[FULL EP.73] เปิดบ้าน 70 ล้าน "แป้ง Zbing" ยกมาทั้งญี่ปุ่น l เคหสถานบานปลาย l One Playground](http://i.ytimg.com/vi/YBnJhTt07Pg/mqdefault.jpg)
The schematic diagram on the video is the reference diagram for current boost regulator from the motorola 7812 datasheet. The more 12 Ohm resistors you add in parallel, the less total resistance as an output load and thus the current draw rises. I'm not sure though that, this way is the best for testing switching mosfets.
I think it is great that the seller wrote "fake" right on the package. It really saves you time. You can throw them straight into the garbage. I have some 2n3055s with the tiniest die you have ever seen. I don't think you can buy genuine power transistors on eBay or Aliexpress. If you are only switching an amp or two they will probably be just fine. Great test rig by the way.
It's alot things can go wrong
Hi Leif:
Thank you for putting the video, this may help many unsuspecting people who buy from companies in China where components are recovered and resold as new. This I have suffered with Utsource that sells fake components and in most cases their shipments are delayed up to 2 months, honestly this although it does not seem very serious, but many of us do not give importance.
Regards.
Three Fukes,you are serious electronics engineer 🙂
Thank you for making that circuit and for making the video.Great stuff!
Three FLUKE METERS
NOT Three Fukes
You have to learn to pay attention to detail
and learn how to write correct grammatical legal English.
Your writing skill is below acceptable standard for you age
unless you are age 8
Learn that CORPORATE legal names are ALWAYS in ALL CAPS
It is even clearly written on the meter
Because you were programmed to be a ZOMBIE - you do not notice
ZOMBIES have eyes but cannot see - ears and cannot hear
Understand that you are not a serious or qualified writer.
Undertake an extensive reading program to educate yourself first
Maybe one is real,other 2 meters are fake?
This problem gets worse and worse also with most of ebay sellers, esp. from china. You can be nearly 100% sure you get fake if you order cheap mosfet, igbt or other transistor and even most ICs are counterfeits. Other methods of testing is measuring the Rdson (Drain-Source-Resistance when on under Load) and measure the drop voltage and divide by the current to get resistance. In most cases it is 2-5 times higher than specification in datasheet. Also the gate capacitance with fake mosfets will normally be lower due to smaller die and less micro-transistors on the die. I just bought fake IRFP4768 and IRFP4668 from China - was hoping for good but obviously fake. So you have to buy from local trustworthy suppliers ;-)
So the function of the 7812 is to keep the Mosfet output (drain) at 12 V?
Yes that is correct
Hi, thank you very much. Good, informative video. I have to test some power devices pretty shortly and will use my DC electronic load instead of resistors, a little more flexible. Thank you very much!
For the NPN transistor I use 7912,, but you can use it but if you redesign it, you just need a reference voltage to Get the transistor to give out approx 12 V, 12 volt was ok for me since I have a lot of 12 Ohm resistors and 32v power supply, that give me 20 V over the test transistor, ANg again give me power loss of 20w with 1A, 40w with 2A and so on .
Are Moose FETs made in Canada?
Hi Leif,, Thank you for doing this video and showing this, I was wondering if there is any way to Test for True J201 Transistors? Thank you.
Almost all transistors I've bought from China (AliExpress / Alibaba / eBay) are fake. Even "recovered" items are sometimes re-labeled (but is off course not the same part and certainly does not have the same characteristics).
Well done man .
Are you using a 7912 for the NPN test?
Irf 9540 is p channal mosfet not transistor so is this right way?
What wattage and value is the resistor in the project box?
it 's 10 ohm (from schematic) and it look like 2 watt but what about the capacitor ?
이렇게 확인해도 되겠네. 대박이다. wonderful video!
I done dumped out 300 hundred dollars trying to make a voltage booster on transistors they keep blowing I think cause they can't handle a 20% of there amps on data sheet.have not checked the gate voltage to see full turn on turn off but I tried diffrent transitors and some held at about 65% amp rating if not more they were awezeicc transistors .going to try order from digikey or mouser now and see what happens
Very clever , thanks 😉🇬🇧
Tank you for this informativo video!!!!!Fake semiconductors are very comon in low price supliers!!!!! Do you like good and trust components?FARNELL It is not cheap price but is very good quality!!!!!
You are testing switch mode mosfets in linear mode? No doubt they will fail even if they are fake weaker models
cool circuit. i might build one.
Hi, I have make a better Circuit now that can test all transistor npn, pnp, mosfet and darlington, planing to make a new Video about that :)
The Circuit at video are not 100% stabil for all transistors I discover that after I make this video.
+Leif Hegre hi, could TH-cam share your idea, circuit about your new tester?
Do you have a schematic for your new test circuit - I have purchased a lot of transistors from Ebay and have been trying to find a way to test them before putting them in the actual circuit.
See datasheet of transistor there have test circuit
Fake transistor - Fake video :D
Very nice 😃
I got a strange idea for a bad fake one, get a high voltage transformer and plug it in the wall and put the output of the transformer on the transistor and make a single use fire starter XD. (!WARNING! DO OUTSIDE, HIGH RISK OF FIRE!) don’t forget to record it.
Did you mention China?
you have got nice accent.what's your native language?
Look like he is German
@@voitano73 NOPE, he is from the west coast of Norway ;-)
I got a fake transistor from utsource marked with ON semiconductor
Yes Utsource sells original and fake components.
Cheers.
When your so poor you have to make fake transistors💀
Hi dad
Hei på dei :)
GGamer Wolfie hei på deg :)
You should include the store name from AliX so no one ever buys anything from them.
Hi, the problem is that it Is so many sellers that sell fake stuff, It is actually hard to find someone that sell real stuff, and I have buy a lot before I found out it all was fake, both from Ebay and Alix, I did report it but nothing happend, Some sellers have pitures of the original but send fake.
جعموصه قشنگه👍👍👍👍👍😎😎😎😎
For a non-destructive test, saturate the MOSFET, and measure the Rds On. If you apply 1 amp across the drain-source junction, measuring the voltage across those terminals with the gate-source junction supplied with the specified voltage, you can compare your readings with the rating listed in the Datasheet, and tell if the transistor under test meets specifications for that type number. (at 1 amp, the voltage across the drain-source pins is exactly proportionate to Ohms) If the on-state resistance is higher, it's a fake. If the resistance is close to rated on-state resistance, then, it's worth the SOA (Safe Operating Area) testing. The devices you have in this video might be mislabeled IRF9510, with an Rds On of ~1.2 Ohms. It's only rated to dissipate 20 watts, which guarantees, that it will fail this test. The Rds On test would reveal the high on-state resistance, which would immediately disqualify it.
Rds ON
not
Rds On
You have not yet learned the difference between ON / OFF ( and ) on / off
They sound the same but they are not the same and are used in a different context.
When you are referring to switching it is always ON / OFF
written in the ALL CAPS
It is even written on switches but you are blind to see it
because you are not trained to pay attention to detail.
Your eyes see one thing and your brain sees something entirely different.
Your School programmed you to be a ZOMBIE
So learn this and teach it to the ZOMBIES - EARN YOUR TEACHERS MEDAL
You need do claim and money back. I am very happy that you if repair some stuff from a 747 you check it 12 times ! it's a scam but you pay less for it. That way it stays that cheap, expensive is and the end.
IRF 9540 is a MOSFET......
Field Effect Transistor
Thanks leif sharing test for fake transistor.. Hehehe made in china..😂😂 china number one fake..😂😂
Aliexpress transistors terrible bad quality... 💩