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Thin / metal film resistors

Discussion in 'Electronic Design' started by Nemo, Jan 8, 2010.

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  1. Nemo

    Nemo Guest

    I notice that Susumu make really cheap metal film resistors - maybe 5
    cents in one-off quantities. Do these have inferior noise performance
    compared to expensive metal film ones from manufacturers like Tyco? I
    realise they may have a worse tempco.

    Thank you,
     
  2. Phil Allison

    Phil Allison Guest

    "John Larkin Bullshits AGAIN "
    ** Huh ?? Makes no sense.

    ** Which is not much at all.

    ** Same old BORING and 100% WRONG story

    YET AGAIN !!!!!!

    Yaaawwwnnnnnnn ................


    ** A couple of volts DC will do to show them up.


    ** Your "set up" was obviously a pile of crap.

    It is very easily to measure the excess noise in carbon comp, metal glaze
    ( ie cermet thick film) and carbon film resistors.

    Not long ago, I posted the details and results of exactly such tests here -
    along with a link to ABSE for pics of the actual resistors used.

    Maker's specs alone are enough to settle the matter.

    But nothing will convince a retarded, bullshitting, fucking IDIOT like
    Larkin.



    ..... Phil
     

  3. 'definitely have figures which are well below shot noise...'

    is that maybe what you meant to say when you mumbled that non-sentence
    above?

    I understood what you were saying, but he obviously didn't.

    Still, 'your set-up' should have been able to measure distinctly
    different numbers for each form factor. If not, 'your set-up' is suspect
    of having too high a baseline noise floor for the job.
     
  4. To think that I was on your side.

    Won't make that mistake again. You stayed on the retard bandwagon all
    by yourself.
     
  5. Bill Palmer

    Bill Palmer Guest

    Knock it off, Thompson.
     
  6. Fred Bartoli

    Fred Bartoli Guest

    John Larkin a écrit :
    Yup, but...
    in case of tempco involved, the resistance has 1/f dependency (in case
    of flat temperature spectral density), i.e. thermally induced voltage
    noise is also 1/f, while in case of excess noise, that's the noise power
    which is 1/f and voltage noise is 1/sqrt(f).

    One good way to sort which is which is to make a normal convection
    "excess noise" measurement, then to carefully pack the resistor in some
    big chunk of foam and do the true measurement.

    No, I haven't done it. But I might (when I'll be idling, so don't hold
    your breath).
     
  7. Tim Williams

    Tim Williams Guest

    Interesting theory. (Almost) full headers for two typical posts are:

    -=-=-=-

    Path:
    feeder.eternal-september.org!eternal-september.org!news.glorb.com!news2.glorb.com!Xl.tags.giganews.com!border1.nntp.dca.giganews.com!nntp.giganews.com!local2.nntp.dca.giganews.com!news.giganews.com.POSTED!not-for-mail
    NNTP-Posting-Date: Sun, 10 Jan 2010 14:26:34 -0600
    From:
    Newsgroups: sci.electronics.design
    Subject: Re: Thin / metal film resistors
    Date: Sun, 10 Jan 2010 13:26:34 -0700
    Message-ID: <>
    References: (snipped)
    X-Newsreader: Forte Agent 6.00/32.1186
    MIME-Version: 1.0
    Content-Type: text/plain; charset=us-ascii
    Content-Transfer-Encoding: 7bit
    Lines: 74
    X-Usenet-Provider: http://www.giganews.com
    X-Trace:
    sv3-1GgD+tLbsXtoQenLc1YnPBtx9HSGDj7EyP0HvDnRaLfo3B2laikwr6SI7HDT0W4nei3YSjagcXqB5Sr!zuRIWP4OHG/qJNDkGi4w/sVWtb1dmMsh9dy/hZfjdyV6Y1VHsiPmQWFUBgF7QZKkjxb62ds=
    X-Complaints-To:
    X-DMCA-Notifications: http://www.giganews.com/info/dmca.html
    X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers
    X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint
    properly
    X-Postfilter: 1.3.40
    Xref: eternal-september.org sci.electronics.design:78835

    -=-=-=-

    Path:
    feeder.eternal-september.org!eternal-september.org!news.glorb.com!news2.glorb.com!npeer01.iad.highwinds-media.com!news.highwinds-media.com!feed-me.highwinds-media.com!Xl.tags.giganews.com!border1.nntp.dca.giganews.com!nntp.giganews.com!local2.nntp.dca.giganews.com!news.giganews.com.POSTED!not-for-mail
    NNTP-Posting-Date: Tue, 05 Jan 2010 12:24:11 -0600
    From: Jim Thompson </Snicker>
    Newsgroups: sci.electronics.design
    Subject: Can you believe:
    Date: Tue, 05 Jan 2010 11:24:10 -0700
    Message-ID: <>
    X-Newsreader: Forte Agent 6.00/32.1186
    MIME-Version: 1.0
    Content-Type: text/plain; charset=us-ascii
    Content-Transfer-Encoding: 7bit
    Lines: 15
    X-Usenet-Provider: http://www.giganews.com
    X-Trace:
    sv3-dAq3uLn/HY4oAf+SmZbXqM669Llmwr8XHv+ZzfJxwu9NLHg04R87NcXDeBaXBTSzIDEpW+UpQqAFOo5!fki5NkGLOVod0ww45of21NCi0TjUQHYs93PzupCsFyqYkI5vO/+1scMoK4ZWje9SJk4XCiI=
    X-Complaints-To:
    X-DMCA-Notifications: http://www.giganews.com/info/dmca.html
    X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers
    X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint
    properly
    X-Postfilter: 1.3.40
    Xref: eternal-september.org sci.electronics.design:77962

    -=-=-=-

    The paths are different, but that doesn't mean anything; another JT post
    went through Google instead of Highwinds.

    All identifying marks are similar, except the X-Trace, which is encrypted.
    Another JT post contains yet another X-Trace, so it would seem it changes
    between postings. I would guess the encryption key changes irregularly, and
    slightly different data is present, e.g., the time and date of login or
    posting is included.

    There could be lots of people on Giganews using Agent 6.00/32.1186, so
    without decryption, it's hardly conclusive. Would be pretty funny if it
    were true though.

    A survey of the troll nyms' headers might be instructive too, but a simple
    killfiling is easier.

    Tim
     
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