• more SD-24 pics

    From John Larkin@21:1/5 to All on Tue Apr 26 14:54:34 2022
    https://metebalci.com/blog/sd24/
    --

    If a man will begin with certainties, he shall end with doubts,
    but if he will be content to begin with doubts he shall end in certainties. Francis Bacon

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  • From Dimiter_Popoff@21:1/5 to John Larkin on Wed Apr 27 02:37:26 2022
    On 4/27/2022 0:54, John Larkin wrote:

    https://metebalci.com/blog/sd24/

    Can't think of anything else to say looking at these shots
    but "whoa".

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  • From John Larkin@21:1/5 to All on Tue Apr 26 17:29:02 2022
    On Wed, 27 Apr 2022 02:37:26 +0300, Dimiter_Popoff <dp@tgi-sci.com>
    wrote:

    On 4/27/2022 0:54, John Larkin wrote:

    https://metebalci.com/blog/sd24/

    Can't think of anything else to say looking at these shots
    but "whoa".

    Imagine building and testing and repairing complex hybrid electronics.
    Lots of wire bonds.

    Just the engineering on that looks like, well, a lot of work. Probably
    without Spice.

    --

    If a man will begin with certainties, he shall end with doubts,
    but if he will be content to begin with doubts he shall end in certainties. Francis Bacon

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Anthony William Sloman@21:1/5 to John Larkin on Tue Apr 26 19:44:25 2022
    On Wednesday, April 27, 2022 at 10:29:13 AM UTC+10, John Larkin wrote:
    On Wed, 27 Apr 2022 02:37:26 +0300, Dimiter_Popoff <d...@tgi-sci.com>
    wrote:
    On 4/27/2022 0:54, John Larkin wrote:

    https://metebalci.com/blog/sd24/

    Can't think of anything else to say looking at these shots
    but "whoa".
    Imagine building and testing and repairing complex hybrid electronics.
    Lots of wire bonds.

    Just the engineering on that looks like, well, a lot of work. Probably without Spice.

    Spice has been around for a very long time. I first used it at Kent Instruments in Luton, around 1975.

    The hermitically sealed device that John Larkin has called "a large (I think Tektronix made) IC" is probably a thick film hybrid. They were popular back then. You could wire bond discrete unpackaged transistors and FETs and get lower inductance
    connections between fast parts that way than you could with the packaged parts available back then.

    https://www.littlediode.com/components/BFT95.html

    I used the 5GHz BFT95 in its SOT37 package back then. We even published the circuit (at my co-authors insistence)

    Ghiggino, K.P., Phillips, D., and Sloman, A.W. "Nanosecond pulse stretcher",Journal of Physics E: Scientific Instruments, 12, 686-687 (1979).

    Tektronix would have been more ambitious.

    --
    Bill Sloman, Sydney

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