Incorrectly marked transistors?

"Cydrome Leader"
Phil Allison
"Gareth Magennis"


I recently bought some TIP35C transistors from Farnell UK. Just before
I
fitted one to an amplifier I thought I'd just check the pinouts.
Good job I did because instead of BCE they measured BEC.


** That is just not possible.

The middle leg is always the collector and metal tab used for
heatsinking.

FFS - get an ohmmeter and verify that simple fact.

Seems your dopey microprocessor ( ie software) based POS has gone ape and
confused Collector with Emitter.

Agreed.

those component testers are sketchy in that you have no idea what they are
doing or how they draw conclusions.
Click to expand...

** Exactly.

The tester that Gareth has operates at very low currents and voltages - a
couple of mA at most.

Some power BJTs lose all current gain at that level, showing Hfes of maybe 1
or 2.

Very likely, this is fooling his meter into giving wrong info about C and E
terminals - since the reading is like that when C and E are reversed.

The tester I designed operates from a 12V supply and one sets the base drive
current with a wirewound pot to get 0.5 amps from the supply.

A calibrated scale gave the base current as a ratio to that current - or
Hfe.

Small signal "Beta" testers are USELESS for this job.


..... Phil
 
"William Sommerwerck"


** FUCK OFF MORONIC TROLL


"William Sommerwerck"


** FUCK OFF MORONIC TROLL


"William Sommerwerck"


** FUCK OFF MORONIC TROLL
 
"William Sommerwerck"


** FUCK OFF MORONIC TROLL



"William Sommerwerck"


** FUCK OFF MORONIC TROLL

"William Sommerwerck"


** FUCK OFF MORONIC TROLL


"William Sommerwerck"


** FUCK OFF MORONIC TROLL

"William Sommerwerck"


** FUCK OFF MORONIC TROLL
 
"Phil Allison" wrote in message news:bjm352Ft22pU1@mid.individual.net...


"Gareth Magennis"


> Phil. I know how my test equipment works,

** Like hell you do !!!!!!!!!!

And you have NO FUCKING IDEA how to test a power BJT.


> I know when I come across an anomaly.

** You think the sky is falling and run around like a headless chook.



FYI: Do you have two DC power supplies?

Use one to provide a collector current of say 0.5 amps.

Use the other to drive the base via a 1 kohm resistor so Ic is 0.5 amps.

The ratio of currents will give you the correct Hfe for most power BJT
devices.



..... Phil




Phil, I am not at all interested in finding the accurate Hfe of a
transistor.
All I need to know is if it works within design parameters, or it doesn't.

If it doesn't I will replace it with something that does.

I will leave Farnell to ensure that the Hfe of the replacement device is
what it should be. That is what I am paying them for.
Otherwise I would have to charge my clients double the labour charge to
verify such things, and they would not be happy, and I would be out of
business very quickly.


Cheers,


Gareth.
 
Phil, I am not at all interested in finding the accurate Hfe of a
transistor.
All I need to know is if it works within design parameters, or it doesn't.

If it doesn't I will replace it with something that does.

I will leave Farnell to ensure that the Hfe of the replacement device is
what it should be. That is what I am paying them for.
Otherwise I would have to charge my clients double the labour charge to
verify such things, and they would not be happy, and I would be out of
business very quickly.


Cheers,


Gareth.




Hmm, having said that, the whole thread is really about Farnell supplying
faulty parts and me identifying them with a Mickey Mouse component tester.

Allegedly.



Cheers,

Gareth.
 
"Gareth Magennis"
"Phil Allison" "Gareth Magennis"


Phil. I know how my test equipment works,

** Like hell you do !!!!!!!!!!

And you have NO FUCKING IDEA how to test a power BJT.


I know when I come across an anomaly.

** You think the sky is falling and run around like a headless chook.



FYI: Do you have two DC power supplies?

Use one to provide a collector current of say 0.5 amps.

Use the other to drive the base via a 1 kohm resistor so Ic is 0.5 amps.

The ratio of currents will give you the correct Hfe for most power BJT
devices.



Phil, I am not at all interested in finding the accurate Hfe of a
transistor.

All I need to know is if it works within design parameters, or it doesn't.
Click to expand...

** Then put some in an ampifier and see.


I will leave Farnell to ensure that the Hfe of the replacement device...
Click to expand...

** HUH ???

You are one arrogant pommy pig.

You have NOTHING to say there is ANY problem with the TIP35/36s you
were supplied.

You come here asking for advice - then you COMPLETELY IGNORE IT.

YOU need a fucking good kick RIGHT UP THE ARSE.

Fucking IDIOT.



..... Phil
 
"Gareth Magennis"
Phil, I am not at all interested in finding the accurate Hfe of a
transistor.
All I need to know is if it works within design parameters, or it doesn't.

If it doesn't I will replace it with something that does.

I will leave Farnell to ensure that the Hfe of the replacement device is
what it should be. That is what I am paying them for.
Otherwise I would have to charge my clients double the labour charge to
verify such things, and they would not be happy, and I would be out of
business very quickly.
Click to expand...


** HUH ???

You are one arrogant pommy pig.

You have NOTHING to say there is ANY problem with the TIP35/36s you
were supplied.

You came here asking for advice - then you COMPLETELY IGNORE IT.

YOU need a fucking good kick RIGHT UP THE ARSE.

Fucking IDIOT.



..... Phil
 
"Gareth Magennis" wrote in message news:%alBu.3143$5p6.1736@fx25.am4...

Hmm, having said that, the whole thread is really about
Farnell supplying faulty parts and me identifying them
with a Mickey Mouse component tester.
Click to expand...

Correct. Please let us know if they turn out to be counterfeit.
 
William Sommerwerck"


** FUCK OFF MORONIC TROLL


"William Sommerwerck"


** FUCK OFF MORONIC TROLL

"William Sommerwerck"


** FUCK OFF MORONIC TROLL


"William Sommerwerck"


** FUCK OFF MORONIC TROLL

"William Sommerwerck"


** FUCK OFF MORONIC TROLL


William Sommerwerck"


** FUCK OFF MORONIC TROLL


"William Sommerwerck"


** FUCK OFF MORONIC TROLL

"William Sommerwerck"


** FUCK OFF MORONIC TROLL


"William Sommerwerck"


** FUCK OFF MORONIC TROLL

"William Sommerwerck"


** FUCK OFF MORONIC TROLL


William Sommerwerck"


** FUCK OFF MORONIC TROLL



"William Sommerwerck"


** FUCK OFF MORONIC TROLL

"William Sommerwerck"


** FUCK OFF MORONIC TROLL


"William Sommerwerck"


** FUCK OFF MORONIC TROLL

"William Sommerwerck"


** FUCK OFF MORONIC TROLL

William Sommerwerck"


** FUCK OFF MORONIC TROLL


"William Sommerwerck"


** FUCK OFF MORONIC TROLL

"William Sommerwerck"


** FUCK OFF MORONIC TROLL


"William Sommerwerck"


** FUCK OFF MORONIC TROLL

"William Sommerwerck"


** FUCK OFF MORONIC TROLL

William Sommerwerck"


** FUCK OFF MORONIC TROLL



"William Sommerwerck"


** FUCK OFF MORONIC TROLL

"William Sommerwerck"


** FUCK OFF MORONIC TROLL


"William Sommerwerck"


** FUCK OFF MORONIC TROLL

"William Sommerwerck"


** FUCK OFF MORONIC TROLL
 
"Gareth Magennis"


** You are liar and a prize cunt.

Fuck you.
 
"Phil Allison" wrote in message news:bjm7m8FtseeU1@mid.individual.net...


"Gareth Magennis"
Phil, I am not at all interested in finding the accurate Hfe of a
transistor.
All I need to know is if it works within design parameters, or it doesn't.

If it doesn't I will replace it with something that does.

I will leave Farnell to ensure that the Hfe of the replacement device is
what it should be. That is what I am paying them for.
Otherwise I would have to charge my clients double the labour charge to
verify such things, and they would not be happy, and I would be out of
business very quickly.
Click to expand...


** HUH ???

You are one arrogant pommy pig.

You have NOTHING to say there is ANY problem with the TIP35/36s you
were supplied.

You came here asking for advice - then you COMPLETELY IGNORE IT.

YOU need a fucking good kick RIGHT UP THE ARSE.

Fucking IDIOT.



..... Phil


No Phil, you are one arrogant Ozzie twat for trying to hijack the thread to
promote your Hfe tester design.

Of which I am not in the least bit interested.


Cheers,


Gareth.
 
"Phil Allison" wrote in message news:bjm41jFt74gU1@mid.individual.net...

The tester that Gareth has operates at very low currents and
voltages - a couple of mA at most.
Some power BJTs lose all current gain at that level, showing
Hfes of maybe 1 or 2.
Very likely, this is fooling his meter into giving wrong info
about C and E terminals -- since the reading is like that when
C and E are reversed.
Click to expand...

If that's true... Is there sufficient sample-sample variation for this to
occur?
 
"Cydrome Leader" wrote in message news:lb4p2b$7fn$1@reader1.panix.com...

Gareth Magennis <gareth.magennis@ntlworld.com> wrote:
"Phil Allison" wrote in message news:bjm352Ft22pU1@mid.individual.net...


"Gareth Magennis"


Phil. I know how my test equipment works,

** Like hell you do !!!!!!!!!!

And you have NO FUCKING IDEA how to test a power BJT.


I know when I come across an anomaly.

** You think the sky is falling and run around like a headless chook.



FYI: Do you have two DC power supplies?

Use one to provide a collector current of say 0.5 amps.

Use the other to drive the base via a 1 kohm resistor so Ic is 0.5 amps.

The ratio of currents will give you the correct Hfe for most power BJT
devices.



.... Phil




Phil, I am not at all interested in finding the accurate Hfe of a
transistor.
All I need to know is if it works within design parameters, or it doesn't.
Click to expand...

Are you confident your tester is performing tests within operating
parameters of your device under test?




Of course I'm not, as you well know. It has a 9v battery which may or may
not produce higher test voltages.

That is not the point.
The point is I can do a direct A/B comparison between devices I know work
and the one in question.

If after years of doing this I come across a batch of transistors that seem
to defy all logic, then I will suspect those transistors as being faulty or
out of spec.
And, if those transistors are then replaced with a different batch from the
same manufacturer and they all test as OK, then my suspicions are confirmed.


This is not rocket science, it is just logic.


Cheers,


Gareth.
 
"Phil Allison" wrote in message news:bjm42pFt7d6U1@mid.individual.net...

"William Sommerwerck"

** FUCK OFF MORONIC TROLL

"William Sommerwerck"

** FUCK OFF MORONIC TROLL

"William Sommerwerck"

** FUCK OFF MORONIC TROLL

"William Sommerwerck"

** FUCK OFF MORONIC TROLL

"William Sommerwerck"

** FUCK OFF MORONIC TROLL


You should consider having a rubber stamp made. Preferably the self-inking
kind.
 
"Gareth Magennis"



This is not rocket science, it is just logic.
Click to expand...

** It is all false logic and pure bullshit.

The " Peak DCA50e " is useless for testing power transistors.

And YOU are just a another stupid, lying pommy cunt.



..... Phil
 
On 01/14/2014 04:51 PM, Gareth Magennis wrote:
"Phil Allison" wrote in message news:bjm352Ft22pU1@mid.individual.net...




FYI: Do you have two DC power supplies?

Use one to provide a collector current of say 0.5 amps.

Use the other to drive the base via a 1 kohm resistor so Ic is 0.5 amps.

The ratio of currents will give you the correct Hfe for most power BJT
devices.



.... Phil
Click to expand...

I have a Sencore Super Cricket I bought for $75. It squeals like a pig
when phase inverted 1kHz square waves are detected. It is great as a
go/no-go in-circuit tester. Out of circuit I use a $15 Chinese
transistor checker for beta matching.

I have 3 current limited bench supplies mfg by Trygon. One helped put
men on the moon.
 
In article <EtSdnSo9L81UrkjPnZ2dnUVZ8nednZ2d@bt.com>,
sound.service@btconnect.com says...
"Phil Allison" <phil_a@tpg.com.au> wrote in message
news:bjkmq7Fjj6uU1@mid.individual.net...

"Gareth Magennis"
"Phil Allison"


I recently bought some TIP35C transistors from Farnell UK. Just before
I fitted one to an amplifier I thought I'd just check the pinouts.
Good job I did because instead of BCE they measured BEC.


** That is just not possible.

The middle leg is always the collector and metal tab used for
heatsinking.

FFS - get an ohmmeter and verify that simple fact.

Seems your dopey microprocessor ( ie software) based POS has gone ape
and confused Collector with Emitter.



I did suspect my dopey checker, but even with a fresh battery it ALWAYS
reads EXACTLY the same,


** ROTFL - since when is THAT any reason to trust it ?????

" It must be right cos it always tells the SAME lie "

Wot an idiot you are.


which is: 3 of them measure BEC with an Hfe of 5, the other one BCE with
an Hfe of 20.

** No fooling.

BJTs have very low Hfes if C and E are reversed.

Like 2 or 3 instead of 100 or 200.

They *also* show very low readings if the meter is no fucking good.

See how that might be confusing ???
Click to expand...

you need a real full range tester..
I have an old B&K that has test currents to select from and you need
to use the upper scale to properly test large units.

Bigger units have higher saturation voltage, higher forward Vbe voltage
and requires more Ibe just to get out of the hole..

In otherwords, you need to subject it to higher currents.

There are a variety of power BJTs that have much different saturations
on the Vce(sat) verses the Vf(be) ect.

If you have one of those auto sensing units, it'll fail!

Jamie


Jamie
 
In article <lb3e1n$e34$1@dont-email.me>, grizzledgeezer@comcast.net
says...
Phil, we've (or at least I've) been putting up with your crap for a long time.

When are you going to get professional help?
Click to expand...

Where have you been, that is how professionals behave :)

Jamie
 
"Maynard A. Philbrook Jr." wrote in message
news:MPG.2d4118313a1b5809989766@news.eternal-september.org...
In article <lb3e1n$e34$1@dont-email.me>, grizzledgeezer@comcast.net
says...

Phil, we've (or at least I've) been putting up with your crap for a long
time.
When are you going to get professional help?

Where have you been, that is how professionals behave. :)
Click to expand...

I took a college course in psychology that started with a quiz to see what we
knew (or believed). One of the T/F statements was "Intelligent people are more
likely to have mental or emotional problems." I responded "true", but it's
supposedly not true. Phil seems to be the exception.
 
In article <lb85hm$lkj$1@dont-email.me>, grizzledgeezer@comcast.net
says...
"Maynard A. Philbrook Jr." wrote in message
news:MPG.2d4118313a1b5809989766@news.eternal-september.org...
In article <lb3e1n$e34$1@dont-email.me>, grizzledgeezer@comcast.net
says...

Phil, we've (or at least I've) been putting up with your crap for a long
time.
When are you going to get professional help?

Where have you been, that is how professionals behave. :)

I took a college course in psychology that started with a quiz to see what we
knew (or believed). One of the T/F statements was "Intelligent people are more
likely to have mental or emotional problems." I responded "true", but it's
supposedly not true. Phil seems to be the exception.
Click to expand...

Are you saying he's intelligent?

Jamie
 
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