On Wed, 17 Apr 2013 18:49:54 -0700, John Larkin
<jjlarkin@highNOTlandTHIStechnologyPART.com> wrote:
>On Wed, 17 Apr 2013 15:56:07 -0500, John Fields <jfields@austininstruments.com>
>wrote:
>
>
>>Nice insight, since if they weren't also sucking his cock by buying
>>his shit he'd try to have them on the rack.
>
>You keep discussing your two favorite subjects! Obsessions, actually.
>
>Yuk.
---
Yuck indeed, but not a discussion, a condemnation by metaphor.
And you, even having been in the melee for what now, ten years?
pretend to be as thin-skinned as you were when you were first flamed
and, certainly, are still extraordinarily homophobic.
Methinks the lady doth protest too much...
--
JF
Reply by John Larkin●April 17, 20132013-04-17
On Wed, 17 Apr 2013 15:56:07 -0500, John Fields <jfields@austininstruments.com>
wrote:
>Nice insight, since if they weren't also sucking his cock by buying
>his shit he'd try to have them on the rack.
You keep discussing your two favorite subjects! Obsessions, actually.
Yuk.
--
John Larkin Highland Technology Inc
www.highlandtechnology.com jlarkin at highlandtechnology dot com
Precision electronic instrumentation
Picosecond-resolution Digital Delay and Pulse generators
Custom timing and laser controllers
Photonics and fiberoptic TTL data links
VME analog, thermocouple, LVDT, synchro, tachometer
Multichannel arbitrary waveform generators
Reply by John Fields●April 17, 20132013-04-17
On Sun, 17 Feb 2013 21:01:25 +1100, "Phil Allison" <phil_a@tpg.com.au>
wrote:
>
>"John Larkin"
> "Phil Allison"
>><dakupoto@gmail.com>
>>>
>>>> As one of the other posters have noted,
>>>> the specifications are pretty loose, in that
>>>> most (like the one from On Semi) state that
>>>> hfe varies between 20 - 70, and at hfe of 70,
>>>> the collector current is 4.0 A, which is not
>>>> very helpful.
>>>
>>>
>>>** OK so you CANNOT read English either.
>>>
>>>You are quite wrong and you have no comprehension of the topic.
>>>
>>>Fuck off.
>>>
>>
>> Don't you have a broken casette player or something to fix?
>
>
>** Do you have any real life at all ?
>
> ( Blatantly rhetorical question )
>
> Larkin is an incorrigible troll feeder and public cocksucker of any poster
>who laps up his crapology.
---
Nice insight, since if they weren't also sucking his cock by buying
his shit he'd try to have them on the rack.
---
> Wot a fucking pathetic way to publicly bloat an already monstrous ego.
>
> What a fucking puke.
>
>.... Phil
Nicely said...
--
JF
Reply by Phil Allison●February 18, 20132013-02-18
"John Larkin"
"Phil Allison"
>
>>Long time ago, I was checking the Hfe of a batch of Motorola MJ4502s -
>>I
>>came across one that tested 450 at 1mA Ic.
>>
>>I thought of framing it....
>
> Some of those big old Moto parts had a lot of leakage currents, so the
> actual
> HFE might be less than apparent.
** The tester I used then applied a 1uA current to the base while monitoring
the collector current with a 1mA meter, DC supply was from a 9 battery.
There was simply no meter deflection until the base current was applied via
a push button switch.
The particular unit was intended for SS transistors any generally gave low
and misleading readings for TO3 devices and no reading at all for TV
horizontal output transistors. So I designed a simple tester to cover TO3s
where the user adjusted the base current so Ic became 0.5 amps and read the
Hfe value from a scale around a pot. The correct test condition was
indicated by getting two red LEDs to go out.
One could also test the Vbe by reading the B-E drop at the same time -
important for good current sharing in parallel BJT output stages.
... Phil
Reply by John Larkin●February 18, 20132013-02-18
On Sat, 16 Feb 2013 11:32:31 +1100, "Phil Allison" <phil_a@tpg.com.au> wrote:
>
>"George Herold"
> dakup...@gmail.com
>> Could some electronics guru please help ?
>> What is the minimum base current for the
>> 2N3055 ? The On Semi data sheet that I
>> downloaded is not very helpful. Thanks in
>> advance for your help.
>
>Minimum base current? You can probably feed it 10nA and get ~1uA from
>the collector
>
>** That is VERY unlikely - the Hfe of power BJTs falls at low ( and high)
>currents so much so that most data sheets do not spec it below about 50mA
>Ic.
>
>Long time ago, I was checking the Hfe of a batch of Motorola MJ4502s - I
>came across one that tested 450 at 1mA Ic.
>
>I thought of framing it....
Some of those big old Moto parts had a lot of leakage currents, so the actual
HFE might be less than apparent. Some of the darlingtons were especially bad.
--
John Larkin Highland Technology Inc
www.highlandtechnology.com jlarkin at highlandtechnology dot com
Precision electronic instrumentation
Picosecond-resolution Digital Delay and Pulse generators
Custom timing and laser controllers
Photonics and fiberoptic TTL data links
VME analog, thermocouple, LVDT, synchro, tachometer
Multichannel arbitrary waveform generators
Reply by George Herold●February 18, 20132013-02-18
On Feb 15, 11:48=A0pm, "Phil Allison" <phi...@tpg.com.au> wrote:
> "George Herold"
> =A0"Phil Allison"
>
>
>
>
>
> > > Could some electronics guru please help ?
> > > What is the minimum base current for the
> > > 2N3055 ? The On Semi data sheet that I
> > > downloaded is not very helpful. Thanks in
> > > advance for your help.
>
> > Minimum base current? You can probably feed it 10nA and get ~1uA from
> > the collector
>
> > ** That is VERY unlikely - the Hfe of power BJTs falls at low ( and hig=
h)
> > currents so much so that most data sheets do not spec it below about 50=
mA
> > Ic.
>
> > Long time ago, I was checking the Hfe of a batch of Motorola MJ4502s - =
I
> > came across one that tested 450 at 1mA Ic.
>
> > I thought of framing it....
>
> Well OK, I've been using these TIP31/32 's in to220 pacs as temp
> sensors, diode conected transitors. =A0At 10nA of collector current the
> ideality is starting to fall off, 100nA looks OK. =A0I figured a higher
> power BJT might be 'good' to 1uA.
>
> ** So you just fucking guessed.
>
> =A0 =A0 How typical for this NG.
Yeah sorry that was what the 'probably' was meant to convey.
I=92ll try to be more specific next time.
I tend to =91guess=92 at a lot of stuff, but I try to indicate when I=92m
doing that.
> > Have you measured a 3055 at 1uA?
>
> ** Hundreds of them.
>
> FYI:
>
> I just tested a vintage 1983 MJ802.
>
> With 1uA base current, Ic =3D 4uA
>
> With 100uA base current , Ic =3D 1.8 mA
>
> With 4.5mA base current, Ic =3D 0.6 A
Nice, thanks for the numbers.
I had no idea it was that bad at low currents.
George H.
>
> .... =A0Phil- Hide quoted text -
>
> - Show quoted text -
Reply by Jamie●February 17, 20132013-02-17
John Larkin wrote:
> On Sun, 17 Feb 2013 19:10:44 +1100, "Phil Allison" <phil_a@tpg.com.au> wrote:
>
>
>><dakupoto@gmail.com>
>>
>>>As one of the other posters have noted,
>>>the specifications are pretty loose, in that
>>>most (like the one from On Semi) state that
>>>hfe varies between 20 - 70, and at hfe of 70,
>>>the collector current is 4.0 A, which is not
>>>very helpful.
>>
>>
>>** OK so you CANNOT read English either.
>>
>>You are quite wrong and you have no comprehension of the topic.
>>
>>Fuck off.
>>
>>
>
>
> Don't you have a broken casette player or something to fix?
>
>
That would be an 8 track!
Jamie
Reply by Jamie●February 17, 20132013-02-17
Phil Allison wrote:
> <dakupoto@gmail.com>
>
>>>Finally someone who can actually understand the question.
>>
>>I fully agree.
>>
>
>
> ** You are fully a fuckwit and a troll.
>
> Learn to write English properly or else FUCK OFF !!!!
>
>
>
> .... Phil
>
>
Phil is a perfect example of english etiquette, he's got the
colorful metaphors of english down pat!
Jamie
Reply by Phil Allison●February 17, 20132013-02-17
"John Larkin"
"Phil Allison"
><dakupoto@gmail.com>
>>
>>> As one of the other posters have noted,
>>> the specifications are pretty loose, in that
>>> most (like the one from On Semi) state that
>>> hfe varies between 20 - 70, and at hfe of 70,
>>> the collector current is 4.0 A, which is not
>>> very helpful.
>>
>>
>>** OK so you CANNOT read English either.
>>
>>You are quite wrong and you have no comprehension of the topic.
>>
>>Fuck off.
>>
>
> Don't you have a broken casette player or something to fix?
** Do you have any real life at all ?
( Blatantly rhetorical question )
Larkin is an incorrigible troll feeder and public cocksucker of any poster
who laps up his crapology.
Wot a fucking pathetic way to publicly bloat an already monstrous ego.
What a fucking puke.
.... Phil
Reply by John Larkin●February 17, 20132013-02-17
On Sun, 17 Feb 2013 19:10:44 +1100, "Phil Allison" <phil_a@tpg.com.au> wrote:
>
><dakupoto@gmail.com>
>
>> As one of the other posters have noted,
>> the specifications are pretty loose, in that
>> most (like the one from On Semi) state that
>> hfe varies between 20 - 70, and at hfe of 70,
>> the collector current is 4.0 A, which is not
>> very helpful.
>
>
>** OK so you CANNOT read English either.
>
>You are quite wrong and you have no comprehension of the topic.
>
>Fuck off.
>
>
Don't you have a broken casette player or something to fix?
--
John Larkin Highland Technology Inc
www.highlandtechnology.com jlarkin at highlandtechnology dot com
Precision electronic instrumentation
Picosecond-resolution Digital Delay and Pulse generators
Custom timing and laser controllers
Photonics and fiberoptic TTL data links
VME analog, thermocouple, LVDT, synchro, tachometer
Multichannel arbitrary waveform generators