Something interesting found in an old databook

D

Dave Platt

Guest
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?
 
In article <l2eaje-5jk.ln1@coop.radagast.org>, dplatt@coop.radagast.org
says...
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?
Click to expand...



What do you think is odd about it ?
 
On 01/20/2018 05:08 AM, Ralph Mowery wrote:
What do you think is odd about it ?
Click to expand...
The emitter has to be connected to the base.
It is not.
 
In article <p3vgdn$at5$1@gioia.aioe.org>, klammerj@NOSPAM.a1.net says...
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.
Click to expand...

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.
 
On 01/19/2018 07:11 PM, Dave Platt wrote:
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?
Click to expand...

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
 
On 20/01/2018 00:11, Dave Platt wrote:
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?
Click to expand...

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

--

Brian Gregory (in England).
 
On Fri, 19 Jan 2018 16:11:33 -0800, dplatt@coop.radagast.org (Dave
Platt) wrote:

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.
Click to expand...

RL
 
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