design for a GOOD TRANSISTOR CURVE TRACER ?

Discussion in 'Misc Electronics' started by peter dingemans, Nov 12, 2004.

  1. G'day everyone,

    I'm planning on building a transistor curve tracer, but so far haven't
    found a 'suitable' design. The only things I've found are general
    curve tracers (for diodes, C's, R's, etc.), not the genuine ones meant
    for transistors (apart from the odd very simple design).

    So, does anyone have any 'real' projects/designs for a good (i.e.,
    general usable, for transistors, fets, etc.) transistor curve tracer?
    Difficulty won't be much of an issue, I'm not an electronics beginner.
    I'd like it to work and look at least as good as a
    professional/commercial design (or as near to it as possible).

    I'd greatly appreciate any help. I've been looking a couple of days
    now on the web, but so far haven't found anything.

    Grtz,

    Peter.
     
    peter dingemans, Nov 12, 2004
    #1
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  2. A curve tracer is not a difficult project ... for casual use. A binary
    counter driving a D/A converter will provide the gate voltage/base current
    steps (more circuits needed for constant current base drive but not too
    tough with an op-amp or two). A sawtooth generator (synched to the counter)
    provides the drain/collector signal. A current sampler (drain or collector
    circuit) drives the vertical input to a scope and the sawtooth provides
    x-axis modulation.

    High power/high voltage capability adds complexity as does accuracy and
    temperature stability.

    It's a fun project, as I have built a few.
     
    Charles Schuler, Nov 12, 2004
    #2
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  3. peter dingemans

    Tweetldee Guest

    "peter dingemans" <> wrote in message
    news:...
    > G'day everyone,
    >
    > I'm planning on building a transistor curve tracer, but so far haven't
    > found a 'suitable' design. The only things I've found are general
    > curve tracers (for diodes, C's, R's, etc.), not the genuine ones meant
    > for transistors (apart from the odd very simple design).
    >
    > So, does anyone have any 'real' projects/designs for a good (i.e.,
    > general usable, for transistors, fets, etc.) transistor curve tracer?
    > Difficulty won't be much of an issue, I'm not an electronics beginner.
    > I'd like it to work and look at least as good as a
    > professional/commercial design (or as near to it as possible).
    >
    > I'd greatly appreciate any help. I've been looking a couple of days
    > now on the web, but so far haven't found anything.
    >
    > Grtz,
    >
    > Peter


    You can download lots of Heathkit equipment schematics from:
    http://web.archive.org/web/20020201194744/http://www.circuitarchive.co.uk/heath.htm

    There, you'll find schematics for the Heathkit model IT-1121, a very nice
    full-featured curve tracer. I have just acquired one of these units and
    it's nothing short of fantastic, given its age and cost. It will give you
    curves for NPN/PNP bipolars, N-channel and p-channel JFets, as well as
    diodes (even tunnel diodes). The collector supply will go up to 200 VDC,
    and allows you to choose base/gate current/voltage steps, and the
    collector/drain load.

    http://web.archive.org/web/20020201...nental.freeserve.co.uk/heath/it-1121part2.gif
    http://web.archive.org/web/20020201...nental.freeserve.co.uk/heath/it-1121part1.gif

    Cheers!!! And best of luck on your project.
    --
    Dave M
    MasonDG44 at comcast dot net (Just subsitute the appropriate characters in
    the address)

    Never take a laxative and a sleeping pill at the same time!!


    ..
     
    Tweetldee, Nov 12, 2004
    #3
  4. peter dingemans

    Jim Thompson Guest

    On 12 Nov 2004 08:10:41 -0800, (peter
    dingemans) wrote:

    >G'day everyone,
    >
    >I'm planning on building a transistor curve tracer, but so far haven't
    >found a 'suitable' design. The only things I've found are general
    >curve tracers (for diodes, C's, R's, etc.), not the genuine ones meant
    >for transistors (apart from the odd very simple design).
    >
    >So, does anyone have any 'real' projects/designs for a good (i.e.,
    >general usable, for transistors, fets, etc.) transistor curve tracer?
    >Difficulty won't be much of an issue, I'm not an electronics beginner.
    >I'd like it to work and look at least as good as a
    >professional/commercial design (or as near to it as possible).
    >
    >I'd greatly appreciate any help. I've been looking a couple of days
    >now on the web, but so far haven't found anything.
    >
    >Grtz,
    >
    >Peter.


    Amongst _many_ found by Googling....

    http://www.fullnet.com/u/tomg/gooteect.htm

    ...Jim Thompson
    --
    | James E.Thompson, P.E. | mens |
    | Analog Innovations, Inc. | et |
    | Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
    | Phoenix, Arizona Voice:(480)460-2350 | |
    | E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
    | http://www.analog-innovations.com | 1962 |

    I love to cook with wine. Sometimes I even put it in the food.
     
    Jim Thompson, Nov 12, 2004
    #4
  5. peter dingemans

    TekMan Guest

    (peter dingemans) wrote in message news:<>...
    > G'day everyone,
    >
    > I'm planning on building a transistor curve tracer, but so far haven't
    > found a 'suitable' design. The only things I've found are general
    > curve tracers (for diodes, C's, R's, etc.), not the genuine ones meant
    > for transistors (apart from the odd very simple design).
    >
    > So, does anyone have any 'real' projects/designs for a good (i.e.,
    > general usable, for transistors, fets, etc.) transistor curve tracer?
    > Difficulty won't be much of an issue, I'm not an electronics beginner.
    > I'd like it to work and look at least as good as a
    > professional/commercial design (or as near to it as possible).
    >
    > I'd greatly appreciate any help. I've been looking a couple of days
    > now on the web, but so far haven't found anything.
    >
    > Grtz,
    >
    > Peter.




    Well, download the schematics and manuals for the tektronix 557 and 7CT1 from here:

    bama.sbc.edu (or bama,edebris.com) for the older 557.
    www.teknetelectronics.com for the 7CT1 /7CT1N.

    this gives you a good start and detailed idea how to the project right :)

    hth,
    Andreas
     
    TekMan, Nov 16, 2004
    #5
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