Don't buy any 2SD2083 and its complementary 2SB1383 transistors until you have watched this video
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- Опубликовано: 19 окт 2024
- I needed a couple of transistors to repair a Denon amplifier , my supplier charges over £14 plus VAT for a pair of these, however there are many of these devices advertised on fakebay and ali express for a couple of pounds a pair , lets see what the extra money buys you .
Thanks Michael, I ran into this exact issue about 5 yrs ago. The replacement transistors for a sub amp kept failing despite all surrounding components testing good. I ran out of time as the customer didn't want to pay anymore. At last I can put a failed repair to rest.)
Had that myself with a amplified speaker, kept coming back with failed class D audio chip, IRS2092 I think the chip was, took me a while before I realised the chips I was fitting were fakes because they just looked so good, it was only when I compared the writing on the chip with a known genuine one I realised.
hello Chris
I make sure everything is okay before handing out the repaired equipment to the customer
I have many competitors and my reputation is prime to keep it 5 stars
if you are a solid engineer and know what's going on always do the
heat test and hfe on transistors before deciding to install
the transistors .
for ic chips the test process is more complex but the important component to test inside the chip is its power output
(read datasheet , put the max load on it's output , measure the output voltage drop and calculate it's loses power and measure case temp )
if all those are near the datasheet specs then u blindly go and install those and make the customer happy and to come back when he gets anything faulty .
been this for 23 years and going on ... I have seen and witnessed the best and the worst in every electronic component performance .
👋👋
Hello Michael, glad to see that you have started to allow people to post some comments. Your electronic repair videos are excellent! Don't worry about any negative comments. Some people are just jealous that they do not know how to perform electronic repairs properly. I found your site a couple of weeks ago and watched most of your videos. I especially liked your videos on fake components. You are helping to make good techs even better. Thanks for sharing some of your knowledge. I look forward to many more of your videos.
Glad you liked the videos, I have more in the pipeline but have to fit these in between working.
Thank you for bringing this to light. I think from now on I will test before I use. Cheers.
Unfortunately it's getting worse than ever, you can easily spend as much time searching for genuine spare parts as you can finding the fault, I would say test and inspect everything with a fine tooth comb before you use it.
Thanks for sharing this. I once bought 100 pieces of 2N3055, and I had to pay more because I asked for military specifications. When I got them, I saw at the surface, under a certain angle in the light that other numbers where removed. With some research I determined that they were types with much lower specifications. I was lucky that the supplier was willing to take them back as the damage would have been extensive if I had used them for the project I bought them for.
its getting to be a very big problem now but luckilly most fakes are pretty easy to spot .
I have also been caught out by auction site fakes. The irony was that the real ICs were actually cheaper from a reputable distributor. Once bitten, twice shy.
To be honest I think most parts sold now on the Internet are fakes but some are harder to spot than otheres, items in current production are less likely to be faked and as you say a current production fake item is likely to cost more than the real thing.
Very very enlightening. I would never have suspected. I read all tje comments too and also enlightening.
Its hard to find any genuine parts these days , especially for vintage equipment .
Welcome to the world of Asian counterfeit parts. So glad I am not servicing anymore. I have even had them from reliable companies.
Just found your channel the other day. Do you have a schematic available for that tester you built? It looks like the cats pajamas.
I too have had fakes supplied from a major company on more than one occasion.
I made this during lock down when I was closed and don't know where I put the circuits as someone else asked this a while back, but I'm still looking, my place is 1700 sq ft and it's not difficult loosing things in here, I do it all the time.
@@michaeldranfield7140 Hi Micheal, I've been interested in some of the test gear you've built and been curious to look for their schematics. If you happen to have lost their schematics, I would suggest you perhaps to make videos showing their innards and the important components you've used. That would definitely give us an idea about what went in and we may be able to find/design something similar for our hobbyist needs. I am especially curious about your LCD-LVDS test pattern generator from an older video of yours. Thanks and much appreciate your valuable knowledge.
@@arsalanjaveed8918 I would be glad to help in the design circuit
😀
Never buy active components from certain auction sites or a certain Chinese electronic emporium, they're certain to be fakes, needed some regulator output devices for my ongoing brc2000 project, i obtained some genuine 1980's stock mj15024's from another member of the vintage radio forum, wouldn't risk using new devices because of this problem.
It's getting to be a big problem, when something is a few years old and the original part has become obselete it's a perfect opportunity for faking components as demand rises and people start to search the Web for replacements.
You can, but, if you're not sure about the vender, buy the minimum quantity, and bench test them. That way, you're not out much, should they be a miss-labeled component. More importantly, if it's a critical component, you don't just trust that they're the right thing, and risk losing an entire production run.
Excellent Video demonstrating the fake rubbish that can easily be found from some on-line sellers.
problem is its everywhere now .
PS Good video, many beginners have been discouraged or frustrated by counterfeit parts.
I would say that unless you go to a reputable company your more likely to end up buying a fake than you are a real part.
@@michaeldranfield7140 I'm old enough to remember tubes that often failed out of the box. Have a good day.
I was not expecting a response from you so soon, thanks. Here's an idea for you to consider. If you placed the Tv or other equipment on a wooden turntable it would make turning the item around much easier for you when you are video taping. I live in Canada and if I was closer I would certainly stop by your shop. Keep up the great videos!
Many thanks for that .
I always make a point of reporting fakes back to eBay. I have always had all my money back (not my time testing things) and I usually get to keep the fake item or at least it goes in my bin.
E bay give the money back if the item is counterfeit but then they don't take these listings down and they continue to be sold regardless.
Are the chinese sellers asking to modify their negative feedback to positive in order to refund you?
@@paulcohen1555 I don't leave feedback until I get the refund.
@@paulcohen1555 no but they sent a silly message saying "the appearance may not look good but these are genuine parts "
What you've got are more equivalent to the 2N3055 (NPN) and 2N2955. (PNP). The price was right, but, I'm sure glad you did a break-down voltage test on them, before installing them in your amplifier....By By emitter follower resistors, and perhaps, the power supply! If they had the break down voltage rating, you would find, that the current limit on the output of the amplifier would be exceptionally low, due to the low beta rating, and the high impedance bias circuitry that would be used for Darlington transistors. The amplifier wouldn't perform well, but at least, it wouldn't generate smoke, or cause any damage.
I knew these would be fake, just didnt know how bad they would be .
A 2N2955 is a germanium low power transistor in a TO-5 can, so that wouldn't make much sense even for fakers! Maybe you're thinking of the MJ2955, or of a TIP2955/TIP3055 pair?
Yes enjoyable Michael i have one if those Peak type testers for measuring Capacitors although not cheap it saves time
absolutely essential now with all this fake stuff flooding the market .
Thank you for the 'heads up'.
No problem at all
Thanks for an interesting video Michael. I was similarly caught out by a fake BU808DFI from eBay, which wasn't even cheap. It wasn't a Darlington, it didn't have a reverse protection diode, it was leaky, and it couldn't stand the voltage even with an external protection diode across it. (I thought I might as well test it to destruction as I had no other use for it). I think if the only place you can find a device is eBay, it is bound to be a fake.
It's the old saying Michael " You get what you Pay for" personally I only use Farnell, or RS Components, cost more, but at least you know what your getting, very good public information video.
RS my first choice and in many cases cheaper than Farnell but lately everything I need most importantly seems to be out of stock and only available for backorder.
You'd be surprised. Even reputable parts dealers can get batches of counterfeit parts. It's unbelievable really how pervasive the fakes are anymore. You just have to test everything today before you use it.
There's also Cricklewood Electronics. The prices might be higher, but they also do many of the JIS typecodes as well.
@@robertneill3057 Yes I know Cricklewood electronics but last time I needed some FET for a disco deck I e mailed them and asked if they could guarantee the ones I wanted were genuine old stock and not Chinese imports but they never replied back so I never bothered with them again .
@@1pcfred I know I have had fakes supplied from a major distributor on more than one occasion already . Fakes so good they must have fooled the distributor .
Hi Micheal
I have just sent back a device 2N5484 which is an f.e.t when tested it is really a double diode common cathode the seller also stated that some devices don’t work this statement is true for all his semiconductors as they are fake and I got a refund with out any argument !!
This was from a well known web site!!
It's getting to be a big problem now trying to get genuine parts, especially for things a few years old, I can't understand why the original manifactures of these components do anything about this.
Another Fine Video Michael And a Warning For Anyone Buying Of Ebay Regards mike.
It would seem most places on the net are selling fakes now its no longer limited to e bay and I would imagine there are some completely innocent people selling fake parts because they don't actually know they are fake themselves .
Good catch! Unless you have some sort of component tester (like your Peak DCA75) or a curve tracer that can provide at least 60V to bust it with, the Max Vceo test you ran would be the only other hint, besides putting it in circuit, then having to remove it because it's rubbish.
It could have been much worse. Transistors tend to fail by short circuiting, which could take out the emitter follower resistors, or perhaps, even the power supply. I have a tube amplifier, that uses a 375 volt power supply for the plates of the power tubes. I'll often connect a 100 k Ohm resistor in series with it, and connect a transistor in series with that high value of resistance, then, measure the voltage across the emitter-collector junction, to verify the actual break-down voltage. The current is low enough, that it will not harm the transistor. It merely acts like a high voltage Zener diode, that is not really calibrated. As long as that break-down voltage is at least 20% higher than the open terminal voltage of the supply rail, that transistor is safe to use in that application. His tester places ~1 milliamp across the transistor, which is perfect.
the biggest problem would be if you fitted these and they went short circuit you could end up damaging even more parts than was wrong with the amp in the first place .
@@vincentrobinette1507 True. Having access to a high voltage DC supply could help you check (as he had, and used), or a making something like a variable "Huntron Tracker" with a low current, higher voltage transformer would also show the transistors forward and reverse junction breakdown voltages.
What I was mostly getting at, was, even if they didn't break down and short due to excessive reverse current, the lack of gain would be sorely noticeable, being they did not contain an internal "Darlington" configuration"
I've had a few BAD buys from Ebay..........so in the USA, I usually buy from the big electronic warehouses. On some of the older models, I've had to go to NTE... but I've always had much better success just ignoring Ebay for any sort of semiconductor.
Many thanks for that, soneone else also suggested NTE equivalents.
I had exactly the same problem with the 2SC5200 and the 2SA1943 versions of this transistor believe it or not, that came from ebay, it seems as if the manufacturers and the sellers are trying to fob people off with bad batches of these
most stuff on e bay is fake , last time I used 2SC5200 I got them from RS components.
there are a lot of 'remarked' devices around, some are 'genuine' but cleaned up 'used' /pulls from equipment, some substandard, or lower grade types marked as higher, or worst, fakes, just 'anything' that looks the same physically, there were and probably still is a lot of 'suspect' 20mhz Z80 cpus on the 'net, i bought some, very cheap, from 2 suppliers, definitely remarked havent tested any yet, also there was a seller on ebay selling 4116 dram chips, which turned out to be 4164s, definitely not drop in compatible without mods! someone on a facebook group bought some and had issues with them burning up(not surprised) so i got a few to test them! they do actually work ok, as 4164s, so not dud ones! i contacted the seller pointing this out that they should state in the listing incorrectly marked and should sell as 4164s but no change...
Its getting more and more difficult to find genuine devices these days and as you say if you complain it makes no difference , the sellers keep selling .
What did the 2SD2083 say to the 2SB1383? "You certainly look nice".
these fakes didn't look particularly nice and easily spotted but I have come across fakes that looked so good they even fooled a main distributor .
I remember I brought 5 scan Ics for Samsung B/C plasmas off some site, I soldered them on perfectly and blew out a y sustain I was confident would work 3 times in a row until I realised the “new” Ics were actually causing it to blow up. They were shorted on several pins they should not of been, it’s they were manufactured wrong. I was so angry wasted like £100 on parts on the thing.
This is bad news though, wonder how many devices have been blown by these cheap knock off ones 😭 I used to use all sorts of cheap transistors off eBay when I was a few years younger 🤣
I know the feeling , i too have amplifiers blow up after fitting a new chip until i realised the chip i was fitting was a completely different one with the same number printed on the front , took a long time but I have seen most of the Chinese fakery now so there's not much that gets past me now !
@@michaeldranfield7140 you have to be careful, as you say I closely check things these days to avoid blow ups and avoid cheap parts altogether. Are you much good at diagnosing digital tech Michael ? I’ve a mainboard I can’t work out what’s going on 🥲
@@MrReeceyburger123 Yes I can see you don't use crap parts , I believe in one of your videos you were using components from Mouser electronics , and your very unlikely to get any sub standard parts from them .
Most of the digital stuff I have worked with has been sky digital boxes , I dont do computers .
If it looks too good to be true: it probably is.
Which is why I only buy vital components from recognised suppliers.
But a good experiment in any case.
of course but unfortunately some older semiconductors can no longer be bought from a main distributor and internet search is your only option .
@@michaeldranfield7140 Which is how I justify my otherwise useless stocks dating from the 1960s and 1970s!
@@MichaelKingsfordGray I know , me too , while most people throw away old and obsolete stock I have kept all mine , even valves !
Yep, it's a thing. I learned the hard way not to buy chips from fleaBay unless they are from domestic sellers with NOS parts, and listings that specifically _don't_ have titles that read like someone strapped a thesaurus to a mattress with jumper cables and a car battery in the middle of a desert cave ;)
Some PC parts are getting to be "collector" items tho, and it's driving prices through the roof. I have a project requiring an i387 math coproc for a 386 board, it's a vintage-parts build, and I'd have a much easier time of it if PLCC-to-PGA adapters weren't unobtanium. As it is, it's going to be a while... I'm not paying $50+ for a single stinking chip, and -- I'm sorry, I don't care what anyone else thinks -- if someone else does, they're plum stupid for it.
I still remember the time, some years back, when Sparkfun Elec out in Colorado bought a reel of unusable Atmel microcontrollers... turns out it was copper slugs in there. I won't be buying an i387 from China, I don't care who sells it. Too many disreputable sellers, too expensive to send back. I'm sorry, I'm not racist I promise -- it honestly hurts me to say, that side of the market's been poisoned. Maybe someday when I feel like I can trust it again, if that actually happens... for now, please excuse me for not holding my breath.
One wonders what actual dies they put in your transistors, though... would be kind of fun to find out!
As you say new old stock is the only way to go but getting genuine nos can be very difficult, take a look at sellers other items if they have lots of stuff from 30 years ago there's a good chance they may be genuine, stay away from anyone who was an unlimited amount of nos
@@michaeldranfield7140 Generally my 'red flag' for _that_ is what other goods they have on offer. If it's just chips, mostly NOS, I'll buy if the price isn't stupid. If it's laid out like a Punjabi market stall, a little of everything, richly spiced, at a price you won't believe (and if you haggle you can get lower), I'm out, right away I'm out.
For these 2 types , you can use the following alternatives :
2SD2083 -> NTE2541
2SB1383 -> NTE2542
Nice video, sometimes the very dim letters on components already give a clue that they are fake. But if you pay with PayPal, you can always get your money back,
but then again, your device is still waiting to get the right components. Same story with the Sanyo STK Amplifier IC's, you find them dirt cheap, but most of them are fake.
Ps: have you already done a video on that testdevice for testing the breakdown voltage, or did i miss that you on your channel ?
PS2: forget my above question, found the video, thank you. Grtz.
Many thanks for the equivalent parts, I am assuming these are current production devices as my equivalent book lists other Japanese parts.
@@michaeldranfield7140 hi, these are indeed current production devices, the 2SD2083 and 2SB1383 are obsolete and no longer in production.
@@BjornV78 aren't NTE types always rebrands of current production devices instead of current production devices? That said, they would be very careful as to which type to rebrand so probably a reliable source anyway.
I saw the tester you used (not the Peak) to check breakdown voltage appers to have been built by you. Nice work!
Is it, or a schematic available?
Thanks!
Someone else asked this and I built this during lockdown when I was closed , I can no longer find my drawings , I did manage to find the most important part of the circuit and you can fill in the missing bits if you want ?
@@michaeldranfield7140 I was the one that initially inquired about the breakdown tester. Perhaps you could do a teardown on it and create some new drawings in the process then put it up here as a new video? I am still very much interested in building one.
@@sw6188 i have the diagram of the hart of the tester if you want to come up with the rest ?
@@michaeldranfield7140 yes, I would appreciate the part you have. If I can successfully fill it in, I'd be glad to send the complete circuit back to you.
@@michaeldranfield7140 That would be a good start. Is it easier to email you?
Great info many thanks for sharing!
Glad you like it .
Michael, have you ever thought about doing a video about space-charge tubes? In 1962 the U.S. car manufacturers had to switch to space-charge tubes in their car radios for a year or two because the early germanium transistors used in the 1960-61 cars lacked gain and they got a lot of customer complaints about poor sensitivity. (Motorola and Philco had hand-picked for gain the germanium transistors in their prototype radios that they used to convince the car manufacturers to switch from tubes to solid state in 1960!) In any event, I find space-charge tubes very interesting.
If I had time I could make a video everyday! I have more on the way not none about space charge at the moment although someone did give me a valve car radio a couple of weeks ago but not looked at it yet.
The only space charge tube was the driver tube, basically with the control grid positive and screen grid used as controlgrid. Rest were like normal tubes.
Creative video, thank you for sharing, like it :)
no problem , many thanks for watching .
I'll keep an eye out for those and similar fakes.
Don't think you will have to look too far most things sold on the net now are fakes, some easier to spot than others.
u want to know if the part is genuine ?
1 it's wieght
2nd the heat losses test
3rd hfe test
the heat losses test
supply 0.8v on base emitter
connect a current limit power supply on it's collector
measure the case temp after few seconds u find a much higher temp
(alot of impurities instead of silicon die).
another thing
they reprint the parts and do an ultrasonic cleaning so the parts donot look they have been salvaged from used PCBs .
I hope u read this but there are so many knockoff electronic components like smps ics
that do not work until doing some modifications in the circuit (because the Knock off 0arts has omitted circuits inside )
an average engineer will not be able to figure this and repair the equipment he's working on .
Been in this trade for donkeys years so I have accumulated a lot of genuine old stock semis which I can use to do comparison tests against suspect parts , a lot of fakes you can just tell by looking but I have seen ones that are so good they are virtually undetectable without testing .
@@michaeldranfield7140 you are absolutely right
I am very glad to find your channel
and I also have original components
to compare with those fake
i have very old transistors like
2n 3055 (Toshiba the red print)
irf840 , 2sd1414 .....
but be aware as also genuine components varies with time
u can compare 2 genuine parts from same manufacturer
(eg. tip35C made in 2000 and same made in 2022)
you find a little bit difference (almost 5%) but that is in my xp due to the old component die deteriorate with such long time .
so what I m doing I read the datasheet and write down
a standard good and working components (like the Irgb4b60kd1)
and many other after I do the test on them that way to make sure
they work perfectly well and the customer do no get upset from a repair process that failed due to components not genuine.
wish you the best and keep up the good work 👋👋
Counterfeiting parts has ruined a large part of electronics. That Peak tester is nice.
Peak electronics is 5 mins down the road from me , I know the owner Jeremy.
Believe it or not I can spend as much time trying to find good parts as I can finding the fault sometimes .and its getting harder by the day , especially when items have been discontinued by the manufacturer.
How about opening them up and taking a look?
A small x-ray gizzmo might be essential these days . One would do maybe a comparison check to a known good chip . Perhaps within limits cos there's mention of possible damage by x-ray to the more highly evolved chips.
I got screwed over on 10 negative voltage regulators that were all fakes (with one blowing up in circuit without any load on it) and a batch of nice looking metal cased (supposed 35 amp) rectifiers that actually contained a bunch of IN4007 diodes instead. I'm a hell of a lot more careful nowadays after that I can tell you and especially buying parts on super fleebay.
regulators 🤣💢 sure the best tradeoff in knockout components
like the free energy videos on RUclips 🤣🤣 right ?
you won't believe me but I have
done test on those like
a 7805A regulator the knockoff
one never reached 5v output at no load it reached 4.88V no load 🤣
so do not install this especially if it feeds vital parts like a microcontroller .
I hope that helps .
Generic components like you mention should only be bought from places like RS components , I know they cost a bit more but you are buying peace of mind, however some of the parts I use can be more specialised or obsolete types that have been discontinued from major distributors and so you only have the internet search option to look for them .
I've had this happen a few times over the years. and I'm pretty careful as to where I source parts. I'd love to find the miserable wretches who perpetrate these frauds, and run a D-10 bulldozer through their production facilities, then back out over their former selves.
I can never understand why the original manifactures of these components don't take action against the places that sell these fakes.
Thank you Sir, now we know.
Treat everything you buy now as suspect and test well before you use it.
@@michaeldranfield7140 noted sir, thanks for your concern.
Does SANKEN still exist and make these parts?
I don't atcually know, the ones I bought from my supplier were old stock but presumably because they wanted so much money for them they never atcually sold them.
Thank you
No problem , thanks for watching .
Great video.
Many thanks for watching
Off topic but do you have a cct for your miliohm meter?
Not at the moment , others have asked , Im working on finding it .
Watch my channel next week.
Dude where did you get that tester from?
Peak electronics in Buxton , Derbyshire. they are on the internet.
I'm genuinely surprised that people buy older electronics from China, without realizing that Chinese people do not have stocks of older stuff, they came to the match later!
This is true , I have even seen Chinese sellers trying to pass 1960 s transistors as old stock .
@@michaeldranfield7140 Incredible.
I have seen colleagues cheated, once BUT70I was bought from China, "I" means insulated, they were not insulated capsule and it exploded quite well when we tested our products.
I was skeptical from the beginning, when I knew that only one manufacturer had made that variant and sold out 10 years ago ...
from what I have seen the metal on real parts has a dull metal finish and fakes are shiny, my guess is the fakes have more lead, hence the shine
The Chinese use a lot of different faking techniques, I think what you are referring to is an old device which has been removed from a board with short legs , so they spot weld on new legs and then dip the leads in some fresh solder to disguise where new legs have been fitted to and already used device .
@@michaeldranfield7140 I have bought some fakes that were new (Sanken) and the common denominator from my experience was the shiny legs and back. Hell, I don't mind pulls as long as it's stated.
Dodgy and dangerous transistors? It's a contest between Ali Express and eBay. The worse thing is some will work a few hours before they fail short and take out other components. At least in Britain, you have reputable distributers to buy from, here in Thailand the best I can do is LCSC in China. I have not gotten any rip-offs from them.
It's not always that good in England, a few times I have had fakes so good they fooled a major distributor.
Looks just like a pare of 2sc5198 and 2sA1941
This sort of fakery is very common these days , virtually impossible to obtain genuine spares these days .
those fakes are probably remarked tip2955s/tip3055s or similar ,, could tip142/tip147 replace those 2S types, theyre rated 100v , theyre a fair bit cheaper in many suppliers,
could be but definitely not darlingtons.
Never buy specialist semiconductors off eBay or AliExpress, especially not if the price is below what’s on LCSC or Digi-Key. You’re better off going for non-fake Chinese parts, at least those have a datasheet you can translate and trust, even if they aren’t very comprehensive. You can’t even buy legitimate TL072s off alibay.
good advice .
2N3055 but sometimes they use BD137
Yes I have seen the fake 2N3055
This is a heinous crime. When I buy RF transistors and they dont work it is just a loss of money and time but when you build a 13.8 v 25A power supply to feed a tranceiver with 2N3055 and they fail you can blow up a $2000 rig. I just dont buy from them any more.
This is the problem , its not the loss of money buying the fake parts , as you say its the damage they cause when they fail .
Unfortunately the global electronics shortage is bringing out even more fake and poor quality components than ever. I’m paying 40 dollars for an IC that cost 4 dollars last year.
if your lucky Chris you may get a used chip thats been cleaned up to look like a new one , if your not lucky you might get any old chip thats been sanded down and laser etched with the numbers you want on top , the most faked semiconductors in my experience are the ones that have been obsolete for years , Ill be watching you channel with interest, give your chip a microscopic examination before you fit it !
Unreal
Faking components is a lot more widespread than you could ever imagine, while it's easy to spot most fakes I have had ones from a major distributer that were so good they fooled the distributor,
looks like a 2n3055 and MJ2955 in that package
Chinese have no conscience, they will print any number you want onto random transistors.
Just assume everything on eBay and Amazon is fake. I'd pull transistors out of scrapped equipment before paying money for them there. Buy parts from authorized distributors like Digi-key or Mouser.
Very good advice .
@@michaeldranfield7140 I will admit I cheat sometimes. I recently bought 100 toggle switches for a project where reliability was not a requirement and I did not mind if 5-10 of them were defective. I was... not disappointed. They were super cheap. But gray market parts might contribute to slave labor, so I try to minimize my interaction with it.
I don't think there is a single genuine transistor among the ones I bought from ****ese resellers on the Amazon marketplace. they are fundamentally all the same transistor, hopefully binned by hfe. they are dirty cheap as general purpose signal and low power transistor for fun projects, but I would never use them for any specific purpose (low noise, high gain, high power...)
usually for the power ones in a plastic case you can tell they are fakes from the weight alone, since they use aluminum instead of copper as support and terminals
Yes , I have used the weighing technique in the past to detect fake STK amp chips , as you say ok for playing about with but little use for a customers repair .
I have come across this fakery before - when I purchased MOSFETS
for a PSU in a Photocopy machine -
They actual specifications were not even close to the original.
That was a lesson learned buying from eBay sellers.
Back in the Mid-1970s when I was on attachment to the USAF -
an examination was conducted on Aircraft spare parts - which
are certainly critical to the safe operation of Military Aircraft --
Parts also have serial numbers and Date of Manufacture maked on them
Horror of horrors - it was discovered that the spare pats inventory
contained 'Fake' parts.
Not desirable at all - and presents a safety risk.
So even the USAF was a victim of like-minded fraudsters.
Fake components are widespread, I have had fakes from a main distributor , so good it must have fooled the distributor , my time is divided between finding the fault and then trying to find components that are not fake and its getting harder to find good parts all the time .
Fake military parts had been ongoing in the USA military industrial complex for some time back in the day like you say . The resolve to seriously tackle the corruption followed the crash of one of the choppers in Iran in ~~ 1980 that were engaged in a black ops to rescue the Americans being held hostage ny the regime of the mad Ayatollah Khomeini. Mission failed and the issue surrounding chopper crash was investigated as is the procedure for aviation incidents. Testing other choppers revealed a suspicion of a faulty mechanical component to be a valid suspicion. It was determined to be fraud..faulty isn't always fraud caused. I've carefully worded cos my own father in ww2 was employed in a critical industry manufacturing engine valves. One day an incorrect substandard alloy got used to make the exhaust valves for an order from Triumph motorcycles. The mistake cost some men's lives in Africa.
@@michaelcorbidge7914 I saw a program on TV once about fake aircraft parts and it said a single bolt could cost $100 which would make a very lucrative market for the fakers .
2N3055 transistors sold on eBay, every one of these are fakes unable to take much more than 1A where as a genuine 2N3055 can take 16A
I never know why they fake 2N3055 as there not very expensive to buy a real one
@@michaeldranfield7140 The point is that you can't buy a real one at least not on eBay and other similar sites from China.
I see fake parts being sold all the time !
Me too, trying to source genuine parts is getting more and more difficult.
The type of printig means buttkus.....if they can fake a package, they sure as heck can fake/copy the printing.....
I'm guessing it won't be too long before they up the printing game and fakes get harder to spot.
everyone's know about ebay fakes for 10 years+ !!!
Fakebay.
cheaky devils
Far more widespread than you may think.
You MUST improve the filming technique you are using.
I realise there are professional video makers on RUclips that make a living out of making RUclips videos, sadly I'm not one of them I just an electronics engineer that gets paid for repairing things.
@@michaeldranfield7140 I understand and I gave you a 👍.
Now it will be very important and nice to "decap" or just carefully break the epoxy and measure the chip size of the original and fake transistors.