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ultra low noise alternative

Discussion in 'Electronic Components' started by .rhavin grobert, Aug 5, 2008.

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  1. could someone please recommend some alternatives for those chips:

    TL 074CN
    TL 072CP

    i'd like to have some chips that have as few noise as possible. I dont
    care if i have to spend some dollars for a chip, i want them to be pin-
    compatible and nearly without noise. any suggestions?

    TIA, .rhavin:)
     
  2. Eeyore

    Eeyore Guest

    Depends if the circuit needs the minute input current of bi-fet op-amps.

    There's no shortage of really quiet bipolar ones at sensible prices.

    Graham
     
  3. neon

    neon

    1,325
    0
    Oct 21, 2006
    while a low noise amp is fine to begin with. it could all be for nothing if the shielding or traces are designed without that in mind.
     
  4. GregS

    GregS Guest


    I would think it depends on the circuit whether a bipolar would work. OPA4134 is a good bifet,
    but you just can't expect it to work if you don't know the circuit. Power supply requirments
    are essential. Then there's the LME49740.

    greg
     
  5. GregS

    GregS Guest

    I don't know why, but I was assuming audio applications. There are all kinds
    of applications that need to be fit into the mix. Is this for instrumentation
    and what is the circuit ?

    greg
     
  6. GregS

    GregS Guest

    One big problem with the internet, unlike books, data disapears if
    its not current.

    greg
     
  7. Eeyore

    Eeyore Guest

    Indeed. The question needs to be more specific.

    Lovely isn't it ? And it's dual friend the LME49720, not to mention a single too, the 49710. Singles
    are rare these days but can come in handy.

    Graham
     
  8. Eeyore

    Eeyore Guest

    That's what the TL07x series was designed for after all.

    Graham
     
  9. Eeyore

    Eeyore Guest

    Keep those good books ! ;~)

    Graham
     
  10. GregS

    GregS Guest

    I have seen the TLO7x series in many applications.

    For a long time I was bent on getting a TLO75 replacement. I guess
    I got over it.

    greg
     
  11. Eeyore

    Eeyore Guest

    Oh yes, they're very versatile and not especially expensive, so well adaptable to mnay circuits,
    however that WAS their intended primary market.

    BTW, it's TL zero seven (five), not Oh (the letter) seven (five). Just being pedantic ! ;~)

    Graham
     
  12.  
  13. Eeyore

    Eeyore Guest

    Changing op-amps won't affect humming one tiny bit. You have some other problem. Could be all sorts
    of things. Take it to a tech.

    Graham
     
  14. i am the tech! ;-) the humming is my 2nd problem, i first have to
    solve the noise, and as the TL074 are pretty good noise generators, i
    want to change them first to have a "clean hum" to start look for and
    as the OPA 4134 is dead, i was looking for some other alternative.
     
  15. Eeyore

    Eeyore Guest

    Must be a pretty cruddy circuit if TL074s are noisy in a guitar amp !

    I guess you're going to be looking at a TI/BB or AD device but I'm not up to date on low noise fet input
    devices, I tend to use bipolar myself.

    I'll tell you one thing though. Modern TL0's may be a fraction quieter than old ones. I know the
    TL081/2/4 spec changed.

    You might want to post in sci.electronics.design. Lots of people are well up on their devices there.

    Graham
     
  16. GregS

    GregS Guest


    You were given two models.

    Put some sockets in there and compare.

    greg
     
  17. GregS

    GregS Guest

    I have been saying TL O for 30 years. Now I stand corrected.

    greg
     
  18. Eeyore

    Eeyore Guest

    I SAY it that way too but write it the other way. In the UK (and I'm sure the USA too) 'oh' is often
    used colloquially to mean zero but not written like that.

    Graham
     
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