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  • Something interesting found in an old databook

    From Dave Platt@21:1/5 to All on Fri Jan 19 16:11:33 2018
    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?

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  • From Ralph Mowery@21:1/5 to All on Fri Jan 19 23:08:37 2018
    In article <[email protected]>, [email protected]
    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?




    What do you think is odd about it ?

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  • From Johann Klammer@21:1/5 to Ralph Mowery on Sat Jan 20 14:33:35 2018
    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.

    --- SoupGate-Win32 v1.05
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  • From Ralph Mowery@21:1/5 to All on Sat Jan 20 10:30:53 2018
    In article <p3vgdn$at5$[email protected]>, [email protected] 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.

    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.

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  • From Phil Hobbs@21:1/5 to Dave Platt on Sat Jan 20 11:05:52 2018
    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?




    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

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  • From Brian Gregory@21:1/5 to Dave Platt on Sun Jan 21 00:51:00 2018
    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?




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

    --

    Brian Gregory (in England).

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  • From legg@21:1/5 to Platt on Thu Mar 8 18:40:34 2018
    On Fri, 19 Jan 2018 16:11:33 -0800, [email protected] (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.

    RL

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