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Topic: numerical challenge
Replies: 90   Last Post: Oct 26, 2012 7:41 PM

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Spehro Pefhany

Posts: 25
Registered: 1/25/05
Re: numerical challenge
Posted: Oct 24, 2012 4:44 PM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

On Wed, 24 Oct 2012 16:27:02 -0400, Roberto Waltman
<usenet@rwaltman.com> wrote:

>Spehro Pefhany wrote:
>>On Wed, 24 Oct 2012 15:27:12 -0400, Roberto Waltman
>><usenet@rwaltman.com> wrote:
>>

>>>John Larkin wrote:
>>>...
>>>

>>>>This is my first-pass qualifier question.
>>>>
>>>> +10V
>>>> |
>>>> |
>>>> C
>>>>+5V--------------B
>>>> E
>>>> |
>>>> 1K
>>>> |
>>>> gnd
>>>>
>>>>(drawn like a real schematic, on a whiteboard)
>>>>
>>>>What is the base voltage? (one answer: 0.6!)
>>>>What is the emitter voltage?
>>>>What is the collector voltage?
>>>>
>>>>What is the base current?
>>>>What is the emitter current?
>>>>What is the collector current?
>>>>
>>>>Any other comments?

>>>
>>>Germanium or silicon?
>>>PNP or NPN? ;)
>>>
>>>Roberto Waltman
>>>[Running for cover...]

>>
>>For a (slightly) more advanced test..
>>

>>>> -10V
>>>> |
>>>> 1K
>>>> |
>>>> C
>>>>-5V--------------B NPN
>>>> E
>>>> |
>>>> gnd
>>>>

>One more question: What is the pressure of the magic smoke inside the
>transistor?


If it's a jellybean NPN, the E-B junction is going to be just fine
(typically they break down around 8-9V and are rated for at least 5V),
and the answers are, as JL says, going to be about the same as his
example except for the higher base current due to typically low
reverse beta. But it fits a different visual pattern, being an NPN
with E grounded-- it's probably not obvious that it's a
"collector-follower".



Date Subject Author
10/22/12
Read numerical challenge
Rich Delaney
10/22/12
Read Re: numerical challenge
Phil Hobbs
10/22/12
Read Re: numerical challenge
Rich Delaney
10/23/12
Read Re: numerical challenge
Phil Hobbs
10/23/12
Read Re: numerical challenge
G. Morgan
10/23/12
Read Re: numerical challenge
Phil Hobbs
10/23/12
Read Re: numerical challenge
Robert Macy
10/23/12
Read Re: numerical challenge
Frederick Williams
10/24/12
Read Re: numerical challenge
Robert Macy
10/23/12
Read Re: numerical challenge
G. Morgan
10/24/12
Read Re: numerical challenge
Spehro Pefhany
10/22/12
Read Re: numerical challenge
William Elliot
10/23/12
Read Re: numerical challenge
William Elliot
10/26/12
Read Re: numerical challenge
Rich Delaney
10/22/12
Read Re: numerical challenge
John Larkin
10/23/12
Read Re: numerical challenge
Jeff Liebermann
10/23/12
Read Re: numerical challenge
John Larkin
10/23/12
Read Re: numerical challenge
John Fields
10/23/12
Read Re: numerical challenge
Phil Hobbs
10/23/12
Read Re: numerical challenge
John Larkin
10/23/12
Read Re: numerical challenge
John Fields
10/23/12
Read Re: numerical challenge
John Larkin
10/23/12
Read Re: numerical challenge
John Fields
10/23/12
Read Re: numerical challenge
krw@att.bizzzzzzzzzzzz
10/23/12
Read Re: numerical challenge
John Larkin
10/23/12
Read Re: numerical challenge
krw@att.bizzzzzzzzzzzz
10/24/12
Read Re: numerical challenge
rickman
10/24/12
Read Re: numerical challenge
John Larkin
10/24/12
Read Re: numerical challenge
P E Schoen
10/24/12
Read Re: numerical challenge
John Fields
10/23/12
Read Re: numerical challenge
YD
10/23/12
Read Re: numerical challenge
John Larkin
10/23/12
Read Re: numerical challenge
Jamie
10/23/12
Read Re: numerical challenge
krw@att.bizzzzzzzzzzzz
10/23/12
Read Re: numerical challenge
Sylvia Else
10/24/12
Read Re: numerical challenge
krw@att.bizzzzzzzzzzzz
10/24/12
Read Re: numerical challenge
Sylvia Else
10/24/12
Read Re: numerical challenge
Robert Baer
10/25/12
Read Re: numerical challenge
krw@att.bizzzzzzzzzzzz
10/24/12
Read Re: numerical challenge
Roberto Waltman
10/24/12
Read Re: numerical challenge
Spehro Pefhany
10/24/12
Read Re: numerical challenge
tm
10/24/12
Read Re: numerical challenge
John Larkin
10/24/12
Read Re: numerical challenge
John Larkin
10/24/12
Read Re: numerical challenge
Roberto Waltman
10/24/12
Read Re: numerical challenge
Spehro Pefhany
10/24/12
Read Re: numerical challenge
Roberto Waltman
10/24/12
Read Re: numerical challenge
John Larkin
10/24/12
Read Re: numerical challenge
Jamie
10/24/12
Read Re: numerical challenge
John Larkin
10/24/12
Read Re: numerical challenge
tm
10/24/12
Read Re: numerical challenge
John Larkin
10/24/12
Read Re: numerical challenge
Jamie
10/24/12
Read Re: numerical challenge
krw@att.bizzzzzzzzzzzz
10/24/12
Read Re: numerical challenge
tm
10/24/12
Read Re: numerical challenge
John Larkin
10/24/12
Read Re: numerical challenge
krw@att.bizzzzzzzzzzzz
10/24/12
Read Re: numerical challenge
krw@att.bizzzzzzzzzzzz
10/24/12
Read Re: numerical challenge
Jeff Liebermann
10/23/12
Read Re: numerical challenge
Les Cargill
10/23/12
Read Re: numerical challenge
P E Schoen
10/23/12
Read Re: numerical challenge
Nico Coesel
10/23/12
Read Re: numerical challenge
Sylvia Else
10/23/12
Read Re: numerical challenge
Nico Coesel
10/25/12
Read Re: numerical challenge
Rich Delaney
10/23/12
Read Re: numerical challenge
G. Morgan
10/23/12
Read Re: numerical challenge
Tim Williams
10/23/12
Read Re: numerical challenge
Sylvia Else
10/23/12
Read Re: numerical challenge
Sylvia Else
10/23/12
Read Re: numerical challenge
Robert Baer
10/24/12
Read Re: numerical challenge
William Elliot
10/24/12
Read Re: numerical challenge
Butch Malahide
10/24/12
Read Re: numerical challenge
William Elliot
10/24/12
Read Re: numerical challenge
Robert Baer
10/24/12
Read Re: numerical challenge
Robert Baer
10/24/12
Read Re: numerical challenge
krw@att.bizzzzzzzzzzzz
10/24/12
Read Re: numerical challenge
Butch Malahide
10/24/12
Read Re: numerical challenge
krw@att.bizzzzzzzzzzzz
10/24/12
Read Re: numerical challenge
Willem
10/24/12
Read Re: numerical challenge
Spehro Pefhany
10/24/12
Read Re: numerical challenge
krw@att.bizzzzzzzzzzzz
10/24/12
Read Re: numerical challenge
Uwe Hercksen
10/24/12
Read Re: numerical challenge
Sylvia Else
10/26/12
Read Re: numerical challenge
Rich Delaney
10/23/12
Read Re: numerical challenge
quasi
10/23/12
Read Re: numerical challenge
Robert Macy
10/23/12
Read Re: numerical challenge
John S
10/23/12
Read Re: numerical challenge
ehsjr
10/23/12
Read Re: numerical challenge
Sylvia Else
10/23/12
Read Re: numerical challenge
Mike Terry
10/23/12
Read Re: numerical challenge
Sylvia Else

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