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Something interesting found in an old databook

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Dave Platt
Guest

Sat Jan 20, 2018 2:11 am   



I stopped by a local electronics-surplus store yesterday (Weird Stuff
Warehouse in Sunnyvale). Out in front they had a rack full of VHS
tapes, cassettes, and other stuff with a "FREE" sign on it. There
were a couple of boxes of databooks of various sorts as well. I dug
through and found two I decided to take home - Motorola, and National
Semiconductor "Small Signal" transistor/diode manuals from a couple of
decades ago. Most of the parts involved are now unobtanium as
new-stock in through-hole packaging, of course, but there are still
enough SMT versions and old-stock around to make these books interesting
reading.

Looking through one, I saw something that I found rather surprising.

http://www.radagast.org/~dplatt/oopsie.jpg

Am I missing something here, or is this as odd as it seems?

Ralph Mowery
Guest

Sat Jan 20, 2018 6:08 am   



In article <l2eaje-5jk.ln1_at_coop.radagast.org>, dplatt_at_coop.radagast.org
says...
Quote:

I stopped by a local electronics-surplus store yesterday (Weird Stuff
Warehouse in Sunnyvale). Out in front they had a rack full of VHS
tapes, cassettes, and other stuff with a "FREE" sign on it. There
were a couple of boxes of databooks of various sorts as well. I dug
through and found two I decided to take home - Motorola, and National
Semiconductor "Small Signal" transistor/diode manuals from a couple of
decades ago. Most of the parts involved are now unobtanium as
new-stock in through-hole packaging, of course, but there are still
enough SMT versions and old-stock around to make these books interesting
reading.

Looking through one, I saw something that I found rather surprising.

http://www.radagast.org/~dplatt/oopsie.jpg

Am I missing something here, or is this as odd as it seems?




What do you think is odd about it ?

Johann Klammer
Guest

Sat Jan 20, 2018 3:33 pm   



On 01/20/2018 05:08 AM, Ralph Mowery wrote:
Quote:


What do you think is odd about it ?


The emitter has to be connected to the base.
It is not.

Ralph Mowery
Guest

Sat Jan 20, 2018 5:30 pm   



In article <p3vgdn$at5$1_at_gioia.aioe.org>, klammerj_at_NOSPAM.a1.net says...
Quote:

On 01/20/2018 05:08 AM, Ralph Mowery wrote:


What do you think is odd about it ?


The emitter has to be connected to the base.
It is not.


Ok, I see it now. Been a long time ago that I really looked close at
what was drawn inside the circle of the devices.

Phil Hobbs
Guest

Sat Jan 20, 2018 6:05 pm   



On 01/19/2018 07:11 PM, Dave Platt wrote:
Quote:
I stopped by a local electronics-surplus store yesterday (Weird Stuff
Warehouse in Sunnyvale). Out in front they had a rack full of VHS
tapes, cassettes, and other stuff with a "FREE" sign on it. There
were a couple of boxes of databooks of various sorts as well. I dug
through and found two I decided to take home - Motorola, and National
Semiconductor "Small Signal" transistor/diode manuals from a couple of
decades ago. Most of the parts involved are now unobtanium as
new-stock in through-hole packaging, of course, but there are still
enough SMT versions and old-stock around to make these books interesting
reading.

Looking through one, I saw something that I found rather surprising.

http://www.radagast.org/~dplatt/oopsie.jpg

Am I missing something here, or is this as odd as it seems?




Pretty odd for silicon, for sure. Germanium transistors commonly had
negative betas (alpha > 1) so weird circuits like that were around back
in the day.

(My 1994 edition Motorola small-signal databook has the figure corrected.)

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
https://hobbs-eo.com

Brian Gregory
Guest

Sun Jan 21, 2018 2:51 am   



On 20/01/2018 00:11, Dave Platt wrote:
Quote:
I stopped by a local electronics-surplus store yesterday (Weird Stuff
Warehouse in Sunnyvale). Out in front they had a rack full of VHS
tapes, cassettes, and other stuff with a "FREE" sign on it. There
were a couple of boxes of databooks of various sorts as well. I dug
through and found two I decided to take home - Motorola, and National
Semiconductor "Small Signal" transistor/diode manuals from a couple of
decades ago. Most of the parts involved are now unobtanium as
new-stock in through-hole packaging, of course, but there are still
enough SMT versions and old-stock around to make these books interesting
reading.

Looking through one, I saw something that I found rather surprising.

http://www.radagast.org/~dplatt/oopsie.jpg

Am I missing something here, or is this as odd as it seems?




Yes it's a mistake. Correctly shown here though:
<http://pdf.datasheetcatalog.com/datasheet/motorola/MPSW13.pdf>

--

Brian Gregory (in England).

legg
Guest

Fri Mar 09, 2018 12:45 am   



On Fri, 19 Jan 2018 16:11:33 -0800, dplatt_at_coop.radagast.org (Dave
Platt) wrote:

Quote:
I stopped by a local electronics-surplus store yesterday (Weird Stuff
Warehouse in Sunnyvale). Out in front they had a rack full of VHS
tapes, cassettes, and other stuff with a "FREE" sign on it. There
were a couple of boxes of databooks of various sorts as well. I dug
through and found two I decided to take home - Motorola, and National
Semiconductor "Small Signal" transistor/diode manuals from a couple of
decades ago. Most of the parts involved are now unobtanium as
new-stock in through-hole packaging, of course, but there are still
enough SMT versions and old-stock around to make these books interesting
reading.

Looking through one, I saw something that I found rather surprising.

http://www.radagast.org/~dplatt/oopsie.jpg

Am I missing something here, or is this as odd as it seems?


Corrected in rev3 '91.


RL

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