What year was the LM13600 released?

Discussion in 'General Electronics Chat' started by daviddeakin, Oct 8, 2010.

  1. daviddeakin

    Thread Starter Active Member

    Aug 6, 2009
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    This might sound like an odd question, but does anyone know what year the LM13600 came out?
    I emailed Don Sauer (who designed it) but he couldn't remember, guessing that it might have been 1977. I don't suppose anyone here would have some old parts catalogue from 77/78 that they could look in for me, to help narrow it down?
     
  2. marshallf3

    Well-Known Member

    Jul 26, 2010
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    Look at the date on the oldest spec sheet you can find on it, it's at least that old.
     
  3. retched

    AAC Fanatic!

    Dec 5, 2009
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    Last edited: Oct 9, 2010
  4. daviddeakin

    Thread Starter Active Member

    Aug 6, 2009
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    I've seen that page (that's where I got Don Sauer's email address!) Don suspected that it was released between his first and second patents.

    I also can't find any pre-1990s data sheets, let alone pre 1980s.
     
  5. retched

    AAC Fanatic!

    Dec 5, 2009
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    There is at least 1 patent that uses the lm13600 that was issued around 1980.. Getting closer.
     
  6. kubeek

    AAC Fanatic!

    Sep 20, 2005
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    You could try asking Don Sauer (email is at the end of the article) about the date .
     
  7. Rbeckett

    Member

    Sep 3, 2010
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    It was an immediate follow on to the 3080 per the link above, might see if you can get any info on the release date of the 3080 and infer/imply from there.
    Bob
     
  8. eblc1388

    Senior Member

    Nov 28, 2008
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    I can confirm that the LM13600 & LM13600A appears in my copy of the "National Semiconductor LINEAR data book, 1980", under the Section "Industrial/Automotive/Functional Blocks/Telecommunications".

    The data sheet also include various(about 30) application of the chip.
     
  9. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    The LM13600 was udes by KORG in the MS-20 wich was produced between 1978 and 1983.
    http://en.wikipedia.org/wiki/Korg_MS-20
    Take a look at the filter section.

    So it must be released before 1978.

    Bertus
     
    Last edited: Oct 10, 2010
  10. daviddeakin

    Thread Starter Active Member

    Aug 6, 2009
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    Hmm...
    "Originally, the filters used Korg's proprietary [KORG-35] chip. Later, the filters were redesigned to use off-the-shelf LM13600 OTAs."
    It doesn't specify how long after their introduction they switched to LM13600.
     
  11. retched

    AAC Fanatic!

    Dec 5, 2009
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    Well, give National a call tomorrow. They will probably have that information at arms length.

    They most likely have a date code list for the IC. Hopefully it starts with the date it went into production.
     
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