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  1. Thread: LED color quality

    by gar
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    LED color quality

    190619-0738 EDT

    A very interesting discussion on the subject of LED color output ---
    ...
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    190618-1740 EDT synchro: Thanks for the...

    190618-1740 EDT

    synchro:

    Thanks for the reference. A very good read.

    .
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    190618-0825 EDT When I made the first post my...

    190618-0825 EDT

    When I made the first post my goal had been to find out what voltage was used in telegraph circuits. The link in that first post did not provide the answer, but the link was...
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    An interesting story

    190617-2501 EDT

    See https://en.wikipedia.org/wiki/Electrical_telegraph

    Many interesting things have been invented since George Washington's time.

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  5. Thread: DC GENERATOR

    by gar
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    190617-1254 EDT On the invention of the...

    190617-1254 EDT

    On the invention of the automotive voltage regulator see ---
    https://ethw.org/First-Hand:The_Story_of_the_Automobile_Voltage_Regulator

    My classmate's father invented a means of...
  6. Thread: POCO issue or not?

    by gar
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    190616-2132 EDT With most areas now having...

    190616-2132 EDT

    With most areas now having smart meters installed, and assuming that the power company can get voltage information from the meters, then it should be possible to get some remote...
  7. Thread: POCO issue or not?

    by gar
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    190615-2216 EDT Consider the general concept...

    190615-2216 EDT

    Consider the general concept of a voltage regulator.

    This a device that in some way can adjust its output voltage based upon the measured output voltage at some output point....
  8. 190615-2007 EDT sengineer101: Consider the...

    190615-2007 EDT

    sengineer101:

    Consider the following question, and if you desire to analyze it, then provide all details on your analysis.

    A Simpson 260 or 270 meter is a Weston D'Arsonval...
  9. Thread: POCO issue or not?

    by gar
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    190514-1425 EDT FionaZuppa: On the surface...

    190514-1425 EDT

    FionaZuppa:

    On the surface the power company plot does not show a problem, but their averaging time per point may be too long.

    You will need to run your own tests.

    My...
  10. Thread: Primary lost phase

    by gar
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    190614-1352 EDT ptonsparky: Assume the...

    190614-1352 EDT

    ptonsparky:

    Assume the primary was also a wye, then one secondary leg would go to zero, and there would be one lost 120 circuit, but the other two would remain at 120.

    If we...
  11. 190614-1334 EDT sengineer101: The problem I...

    190614-1334 EDT

    sengineer101:

    The problem I saw in your first post was that you spoke like an electrician rather than like an engineering student. If I don't really know what your background...
  12. 190614-0815 EDT sengineer101: I have...

    190614-0815 EDT

    sengineer101:

    I have questions about your education.

    At what school are you attending for your EE program?
    At what level are you in this program?
    Have you previously been...
  13. Thread: POCO issue or not?

    by gar
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    190613-2414 EDT FionaZuppa: I don't know if...

    190613-2414 EDT

    FionaZuppa:

    I don't know if UPSs trip on spikes, usually it is dips. I also don't trust power company recording, from experience, unless I really know something about their...
  14. Thread: DC GENERATOR

    by gar
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    190613-2029 EDT See...

    190613-2029 EDT

    See http://www.circuitstoday.com/types-of-dc-generators

    .
  15. Thread: POCO issue or not?

    by gar
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    190613-1952 EDT FionaZuppa: What is the...

    190613-1952 EDT

    FionaZuppa:

    What is the definition of "nominal"?

    The following is from https://www.merriam-webster.com/dictionary/nominal

    See 3 b.
  16. Thread: DC GENERATOR

    by gar
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    190613-1933 EDT bobby ocampo: I will answer...

    190613-1933 EDT

    bobby ocampo:

    I will answer in a simple fashion that it is shunt. But that needs qualification.

    Consider a shunt wound generator. What happens as RPM changes? Think thru this...
  17. Thread: Bay Lighting

    by gar
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    190613-1430 EDT tortuga: I favor the RR...

    190613-1430 EDT

    tortuga:

    I favor the RR over a solid-state for a couple reasons.

    One, voltage drop in the millivolts compared to more than a 1 volt. That is a big difference in switch power...
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    190613-1311 EDT swish41: Your question as...

    190613-1311 EDT

    swish41:

    Your question as presented is un-understandable.

    What does "dropping a phase" mean? Apparently it does not mean loss of a phase, like a fuse blown on one leg.
    ...
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    190613-1303 EDT charlie b: I might expect...

    190613-1303 EDT

    charlie b:

    I might expect the University of Washington would have a similar connection thru their library. It may be that if you visit their library that from the library...
  20. Thread: DC GENERATOR

    by gar
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    190612-2106 EDT bobby ocampo: Any magnetic...

    190612-2106 EDT

    bobby ocampo:

    Any magnetic generator is going to require a non-zero magnetic field, and a conductor moving thru that field, AC or DC.

    A DC generator will have either a...
  21. Thread: DC GENERATOR

    by gar
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    636

    190612-1930 EDT bobby ocampo: I don't...

    190612-1930 EDT

    bobby ocampo:

    I don't understand your question. Can you clarify what you are asking?

    .
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    190612-1720 EDT From the University of...

    190612-1720 EDT

    From the University of Michigan library system


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    190611-1932 EDT charlie b: The University...

    190611-1932 EDT

    charlie b:

    The University of Washington library might have a copy, and I might expect anyone might have access.

    .
  24. Thread: Bay Lighting

    by gar
    Replies
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    1,655

    190611-0814 EDT I would use GE RR relays, and...

    190611-0814 EDT

    I would use GE RR relays, and low voltage control. Now you can do all sorts of things. But most electricians seem to get totally confused by such systems.

    .
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    190611-0751 EDT Whether something is a wye or...

    190611-0751 EDT

    Whether something is a wye or delta has to do with wiring or configuration of the device.

    Wye or delta alone says nothing about grounding. If you want to define how it is...
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