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value of Lab-Volt power supply

Discussion in 'Electronic Basics' started by [email protected], Sep 16, 2008.

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  1. Guest

    I have an ac/dc power supply with a DC and a VOM meter. It's fairly
    large with 3 units stacked together. I couldn't find any model #. Any
    idea as to it's value?
     
  2. Sjouke Burry

    Sjouke Burry Guest

    Sorry, my magic globe is out of order.
    And my guessometer is shorted.
    If you dont know what you have , ho could we know????
     
  3. Sjouke Burry

    Sjouke Burry Guest

    Sorry,that picture is (almost) unreadable(unfocused lowres).
    I would advice to check the meters/dials for their range,
    and to verify your guesses with attaching some
    heavy resistors to load the supply, and measure voltage
    stability at a number of load currents.
    That way, besides learning what these kind of supplies
    can deliver, you learn a lot of useful stuff.
    Watch out for fold back over current protection, some supplies
    switch to constant current output when overloaded, others
    decrease the maximum current to a low value when overloaded/
    shorted, to keep the temperature of the supply within limits.
    If you can get a better picture, some people might recognize
    the make/brand.
     
  4. Phil Allison

    Phil Allison Guest

    "Peter Bennett"

    ** Been posted long ago.


    ** The name is in the heading " Lab-Volt "

    http://www.labvolt.com/


    The OP's unit look like something they produced for electronics students 30+
    years ago.



    ...... Phil
     
  5. Guest


    http://www.labvolt.com/products/ele...ntation/laboratory-instrumentation-system-438

    This device's design is indeed very old, but it's still being produced
    and
    sold. It is intended for students and novices, not for professionals
    or serious hobbyists. I used to work at Lab-Volt and I've tested or
    fixed a few of these...
    If you could see how this thing is made inside it would feel like
    making a
    time travel some 25 years back..

    There's a link for the datasheet on the page.

    Patrick
     
  6. I've never seen much value in a variable power supply. Yes, they
    can look all fancy and there's certainly more to them than fixed voltage
    supplies.

    But for a lot of use, you never need more than a few fixed voltages.
    +12, -12 and +5v. Indeed, you are more likely to need multiple
    voltages at the same time than variable voltage.

    For the time one needs actual variable voltage, they can throw together
    something outboard with a 317 variable voltage regulator. If they like
    it enough, they can add it to the fixed voltage power supply (assuming
    there is room) and let it sit there for the next time it's needed.
    Meters look impressive, but again one can get by with an external meter.

    There is a definite need for a variable power supply for some uses,
    just as some will need a power supply that can put out a lot of current.
    But those often fall out of the every day. The average hobbyist is
    better off with multiple low current supplies, because they
    may need to power more than one thing at the same time but want
    isolation, and toss some money down for a cheap second DMM that
    can do the work of the fancy meter on the variable power supply.

    Michael
     
  7. Phil Allison

    Phil Allison Guest


    "Phil Allison"

    http://www.labvolt.com/products/ele...ntation/laboratory-instrumentation-system-438

    This device's design is indeed very old, but it's still being produced
    and sold.

    ** Amazing something so obsolete is still available.


    It is intended for students and novices, not for professionals
    or serious hobbyists.


    ** Like I commented.


    I used to work at Lab-Volt and I've tested or
    fixed a few of these...
    If you could see how this thing is made inside it would feel like
    making a time travel some 25 years back.


    ** Only back to 1983 ?


    There's a link for the datasheet on the page.


    ** Can you give the OP an idea of its value then ?



    ...... Phil
     
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