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    4$$
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    160722-1254 EDT I stopped at the shop and...

    160722-1254 EDT

    I stopped at the shop and looked at our 1992 HAAS and the voltage taps are labeled 196, 214, 230, and 246. The ratios between these are 1.09, 1.07. and 1.07 . Not quite 10%. Since...
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    4$$
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    160722-1156 EDT From a HAAS on-line manual: ...

    160722-1156 EDT

    From a HAAS on-line manual:



    The +/-10% has to apply to the nominal voltage, and not an allowed phase to phase unbalance. Generally the machines seem to be rated from 195 to...
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    4$$
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    160722-0850 EDT jim gage: All of our CNC...

    160722-0850 EDT

    jim gage:

    All of our CNC machines are HAAS and these all have input transformers with taps to adjust for different nominal input voltages. In the case of our machines I believe...
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    33$$
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    906

    hbiss: With reference to your post numbered...

    hbiss:

    With reference to your post numbered #11.

    A dynamic (magnetic), crystal, or capacitive microphone in of itself is not a signal amplifier. All of these alone produce less signal output...
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    33$$
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    906

    160717-1716 EDT Newly developed permanent...

    160717-1716 EDT

    Newly developed permanent magnet is mentioned in http://www.alliedcatalogs.com/html/1940/hr101.html
    But I did not Alnico 5 identified.

    .
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    33$$
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    906

    160717-1650 EDT Permanent magnet speakers 1938...

    160717-1650 EDT

    Permanent magnet speakers 1938
    http://www.alliedcatalogs.com/html/1938/hr096.html
    Lots of interesting things in this and other catalogs.

    And big changes from 1938 to 1940.

    .
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    33$$
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    906

    160717-1314 EDT I was not aware of any "hum...

    160717-1314 EDT

    I was not aware of any "hum bucking" coils. There would be no object in bucking 60 Hz since the ripple fundamental frequency is 120 hz. Thus, filament supply current could not be...
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    33$$
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    906

    1607162258 EDT On searching I found a very...

    1607162258 EDT

    On searching I found a very interesting article that is probably correct in many respects. I somewhat question the time sequence information for microphones in the 1930 to mid 1940...
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    33$$
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    906

    160716-1540 EST hbiss: The intent of my...

    160716-1540 EST

    hbiss:

    The intent of my original post was to start a discussion. I was thinking of telephone communication. But there is no reason that should be a restriction on thought.

    I...
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    33$$
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    906

    169716-0822 EDT GoldDigger: Good reply. I...

    169716-0822 EDT

    GoldDigger:

    Good reply. I used the wording "voice signal" to imply several things. A moderately linear amplifier, and to exclude talk about perpetual motion and "bang-bang"...
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    33$$
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    906

    160715-2446 EDT zbang: I would classify...

    160715-2446 EDT

    zbang:

    I would classify this as a power concentrator, but not a power amplifier.

    The triode vacuum tube can be a power amplifier of a voice signal, or other signal. It is a...
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    33$$
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    906

    Voice signal power amplifier.

    160715-2139 EDT

    Who invented the first voice signal power amplifer, and how does a signal power amplifier work? Why was this invention important? Note conservation of energy does not allow...
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    5$$
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    160709-2403 EDT larryv: Your original post...

    160709-2403 EDT

    larryv:

    Your original post is not adequately clear and you need a good understanding of basic electrical theory.

    I will make some asumptions as follow:

    1. Your power...
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    15$$
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    543

    160707-1928 EDT If you do not need to switch...

    160707-1928 EDT

    If you do not need to switch under load, then consider a plug.

    For example:...
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    15$$
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    543

    160707-1533 EDT Something does not compute....

    160707-1533 EDT

    Something does not compute. How, do you stress test a 1200 HP engine with a 25 HP load? For loading engines of this size you need a hydraulic load or something similar.
    Then you...
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    160706-0854 EDT You have not mentioned the...

    160706-0854 EDT

    You have not mentioned the type of load or load current.

    If the load is within the ratings of a GE RR relay, then I suggest that you look at the RR as a possibility.

    A GE RR...
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    6$$
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    543

    160704-1445 EDT I went searching and it...

    160704-1445 EDT

    I went searching and it appears that tuition is somewhat over $1000 per credit hour.

    By comparision I found in my 1950 University of Colarado Bulletin for the Engineering School...
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    6$$
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    543

    160704-0956 EDT Take a look at...

    160704-0956 EDT

    Take a look at...
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    6$$
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    160704-0909 EDT At the University of Michigan...

    160704-0909 EDT

    At the University of Michigan website I found the following information: Enter http://ro.umich.edu/tuition/tuition-fees.php , then scroll down to Engineering. It appears that...
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    6$$
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    160624-1523 EDT jbonest: First, you need to...

    160624-1523 EDT

    jbonest:

    First, you need to understand how various electrical components work. An understanding of what may be inside of this "black box" is next. This is going to be a guess...
  21. 160621-1646 EDT I believe your question...

    160621-1646 EDT

    I believe your question indicates you have little electrical background. A simple transformer arrangement won't convert a single phase power source to a three phase power source....
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    8$$
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    625

    160630-1114 EST There are many questions to...

    160630-1114 EST

    There are many questions to ask.

    1. What is the required response time? 1second, 1 minute, or 1 hour.
    2. What accuracy is required?
    3. Do you need power measurement?
    4. Would...
  23. 160619-2215 EDT Attached is a photo of the 3...

    160619-2215 EDT

    Attached is a photo of the 3 phase induction motor curves I referenced above from Bailey nd Gault.

    .
    15150
    .
    Note:
    Full rated load is 35 HP.
    Current at full rted load about...
  24. 160619-1611 EDT I took a look at one motor...

    160619-1611 EDT

    I took a look at one motor performance plot for a 35 HP motor. See figure 13-12, p 213, of "Alternating-Current Machinery", Bailey and Gualt, McGraw-Hill, 1951.

    Current vs load...
  25. 160617-113 EDT Becca R: Instead of a 12 ohm...

    160617-113 EDT

    Becca R:

    Instead of a 12 ohm resistor load on the 120 V circuit what load can you use there to achieve the goal of a 10 A line current and 1/2 the power dissipation of the...
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