hard to get components

Discussion in 'Electronics Resources' started by Neil Groves, Nov 14, 2011.

  1. Neil Groves

    Thread Starter Member

    Sep 14, 2011
    125
    3
    I am having some problems obtaining parts for projects mainly i think because i am building from schematics that are years old, typically 1980's, does anyone have any good suppliers for these kind of parts, mainly I.C's?

    LM3900
    CA3080
    LM3403

    When i do find a stockist they usually want a minimum order such as $75 which makes it an expensive investment, else they have a minimum order of 100 or 500, obviously way too many for my needs.

    Also i need a supplier that would stock all the I.C's i listed above so i don't have to pay postage for 3 seperate orders from various companies, any help would be appreciated.

    How do you guys go on about obtaining obsolete parts?

    Neil.
     
  2. praondevou

    AAC Fanatic!

    Jul 9, 2011
    2,936
    488
    You find them all on ebay. I would however try to find a replacement for them. Strange that the CA3080 is not easily available, I used a few years ago quite often....
     
  3. ErnieM

    AAC Fanatic!

    Apr 24, 2011
    7,386
    1,605
    My first spot for finding components is always FindChips.com. They sell no parts, instead they search out some 33 distributors to see who has some on their shelves.

    All three parts showed up in their searches.
     
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  4. K7GUH

    Member

    Jan 28, 2011
    191
    23
    I recommend Dan's Small Parts and Kits, in Montana.He is currently closed for the months of November, December, and January. Another possibility is canakit.com, located in Canada.
     
  5. atferrari

    AAC Fanatic!

    Jan 6, 2004
    2,646
    759
    If you search you will find a note to some one who asked about them: the masks for producing that chip were lost in a fire I don not know where.

    The only hope is the existing stock around the globe. Otherwise those LM13600??, OTAs as well.
     
  6. elec_mech

    Senior Member

    Nov 12, 2008
    1,513
    193
    To add to ErnieM's post, Octopart is another good search engine for parts available from distributors. http://octopart.com/

    Once in a while I'll find something from Octopart not found on Findchips. All three parts were available on Octopart as well.
     
  7. Neil Groves

    Thread Starter Member

    Sep 14, 2011
    125
    3
    Thanks guys, i'll take a peek.

    Neil.
     
  8. Neil Groves

    Thread Starter Member

    Sep 14, 2011
    125
    3
    Just searched around and findchips.com came up trumps, thankyou so much Ernie!

    Neil.
     
  9. Jotto

    Member

    Apr 1, 2011
    159
    17
    For obsolete parts Mouser is a good source.
     
  10. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    LM3900: Digikey, Newark, Farnell, Mouser, AvnetExpress, Arrow, FutureElectronics, RS Components, Online Components

    LM13700 instead of CA3080 - many vendors have them also.

    The LM3403 is basically four 741 opamps in one package. You could select a better opamp by having a monkey do a random Internet search. Almost any voltage feedback opamp would be better. Try a TL074 or TL084.
     
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