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Need info/datasheet for an 8-pin DIP (pic enclosed)

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  • #16
    Surface mount makes more sense for companies bringing out re-issues since it is easy to make or get an adapter pc board for the chip to be used in 16, 8 Dip and inline 8 or 9 in addition to SMD. If they have a limited budget, it makes more sense when only one outline is needed to satisfy the circuit requirements. That means rarer chips will be available than if they had to make the same in 3-6 styles.
    BBD chips really are pretty limited in performance so new designs would not use them but some old gear could be brought back to life using re-issues.

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    • #17
      Originally posted by Audiotexan View Post
      Well help me pull my head out of the sand then brother!! lol

      What am I all fogged up about? I'm obviously forgetting a 'basic' here somewhere. *sigh* :/

      I was judging that a swing 'through zero' (meaning pos. Vs rail to neg. Vs rail, with 'ground as zero') would be safe since the "DC Input Voltage" says +Vs to -Vs
      Yes it is safe, both datasheets say so.
      As opposed to saying it saying "+Vs OR -Vs".
      Nowhere it says OR , both clearly say:
      +Vs to -Vs
      and
      V+ to V-
      which of course is exactly the same.

      So the other option I'm thinking is you're saying it should be all "-18Vdc" or "+18Vdc" and the same for the 36v specced max, with no swing 'through zero'.
      Donīt know what this means and is nowhere on the datasheet anyway.
      And Iīm not saying that either.

      FWIW: I'm using the SK9201 pdf that JPB kindly linked, with a PDF that I had on file for the Intersil (ca3080 ota (Intersil) 1988 Sept). Pic of the two side by side to follow:
      [ATTACH=CONFIG]29668[/ATTACH]
      Cool, me too.
      Donīt know why you think those 2 datasheets say different things, while they say exactly the same.

      The left one specifies max +/-18V supplies which is exactly 36V end to end ; the +/- sighs are clearly readable, yet you missed writing them in your first post; while the one on the right specifies 36V from V+ to V- terminals, exactly the same.
      Juan Manuel Fahey

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      • #18
        Originally posted by J M Fahey View Post
        Yes it is safe, both datasheets say so.
        OK, that clears up alot in itself. Assuming I'm on the same page finally...

        Originally posted by J M Fahey View Post
        Nowhere it says OR , both clearly say: and which of course is exactly the same.
        No no, I said 'OR'. Which was me trying to say "it would have been easier for me to follow exactly what was intended when they wrote it this way if they had used the phrase 'OR'."
        Sorry I confused you there. (But 'or' is rendered moot, and further explained below)

        ...it should be all "-18Vdc" or "+18Vdc"...
        Originally posted by J M Fahey View Post
        Donīt know what this means and is nowhere on the datasheet anyway.
        And Iīm not saying that either.
        When I started struggling to understand there, is the only thing I could think of was that you might be trying to get me to understand that Vs had to come from a single supply with a ground applied at the other. EG: if Vs is Neg., then ground should be tied to +Vs, and vice-versa. (No swing 'through zero)
        Which *you were not* saying...so np there! Sorry for not being clearer.

        Originally posted by J M Fahey View Post
        Cool, me too.
        Donīt know why you think those 2 datasheets say different things, while they say exactly the same.
        Well, that's something I've *always* had a hard time with unfortunately (as well as the source of a LOT of frustration over the years). And I'll apologise (on time in this case, and) in advance for when it rears it's ugly head and creates confusion/frustration for others. Believe me, I don't intend to.

        Both verbal phrasing, as well as written word, sometimes eludes me, and creates issues. You can say the same thing 3 different ways sometimes, and it may take a 4th approach until it rings clear to me. So thanks for bearing with me! Anyways...

        I didn't make that leap, because I didn't read it that way. I was obviously wrong then when I read the +/-18V and interpreted to mean 18V max. But that's how it read(s) to me when noted/stated the way NTE did. So again, I appreciate your clarification and correcting me!!

        The Intersil method/phrasing is easy to read/interpret for me. As it made perfect sense out of the gate, that's why I knew that one was a safe 'swing through zero' (as I put it) or 'end to end' (as you put it).

        When I see Intersil's method, even without the "Between V+ and V- Terminal", I read:
        Max: 36v.
        Input: V+ to V- ('end to end' or ground and up to 36V)

        When I see NTE's method, even with the +/- in front of the 18V I read:
        Max: 18v (and the +/- appears redundant since it's noted below)
        Input: +Vs to -Vs ('end to end' or ground and up to 18V)

        Even though I see the "Flexible Supply Voltage Range: +/-2V to +/-18V" I take that as: OK, max Vdc of 18, which can safely be done up to either -9v to +9v, or ground and 18v (regardless of whether the 18v is pos. or neg. as long as it's applied to the correct pins of course).

        I would have never read it as +18 on one side, and -18 on the other (or sum total 36v). Where I probably went wrong was when I looked at the NTE sheet, and saw the same "+Vs to -Vs" and then look above it to see +/-18. To me (and without your help here) those sheets meant two very different things.

        Even though NTE notes: "Flexible Supply Voltage Range" I dismissed it, because I know that the Intersil is also a "Flexible Supply Voltage Range" even though they have not stated such verbatim. Ergo: the Intersil can theoretically operate at 18V end to end or 12v end to end, and thus is 'flexible' as well (just like the NTE) So that didn't draw any flags for me either. :/

        Originally posted by J M Fahey View Post
        The left one specifies max +/-18V supplies which is exactly 36V end to end ; the +/- sighs are clearly readable, yet you missed writing them in your first post; while the one on the right specifies 36V from V+ to V- terminals, exactly the same.
        I obviously didn't miss writing them. I missed understanding them. So again, thank you!

        I guess the easier way for me to have understood that style of notation structure out of the gate would have been more like:
        Input Max: +18V to -18V.
        Which is what you were trying to tell me.
        /facepalm. /sigh.

        /comedy value only
        PS: Thanks for yet ANOTHER headache NTE.
        (Stress reliever, had to be done. lol)
        Start simple...then go deep!

        "EL84's are the bitches of guitar amp design." Chuck H

        "How could they know back in 1980-whatever that there'd come a time when it was easier to find the wreck of the Titanic than find another SAD1024?" -Mark Hammer

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