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Type: Posts; User: gar

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    Telephone voice quality

    150126-2117 EST

    Have you noticed how badly distorted some phone signals are today? Recently my daughter got an I-phone 6, and dropped her home phone line. Most of the time she is nearly...
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    150126-0953 EST big john: If at least you...

    150126-0953 EST

    big john:

    If at least you make voltage measurements at the generator with RMS and average reading meters, then there may be useful information. The readings of both meters...
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    150125-2134 EST A simple experiment with a...

    150125-2134 EST

    A simple experiment with a Fluke 27 (average reading) and a Beckman 4410 (RMS reading) AC voltmeter.

    The experiment is voltage measurement on the output of an inexpensive UPS...
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    150123-1104 EST big john: Your relay...

    150123-1104 EST

    big john:

    Your relay circuit consists of an adjustable series resistance for setpoint adjustment. This feeds a bridge rectifier with a capacitor in parallel with the bridge...
  5. Thread: dimmers

    by gar
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    150116-2353 EST mwm1752: Can you explain...

    150116-2353 EST

    mwm1752:

    Can you explain what your post numbered 18 says?


    How does a single switch correlate with a 50% draw? How do you produce a 50% draw?

    Can you describe in precise...
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    150116-0914 Do a Google search with ---...

    150116-0914

    Do a Google search with --- component life vs temperature --- then modify the search string to more directly address your specific concern. Try this string --- transformer life vs...
  7. Thread: dimmers

    by gar
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    150115-0844 EST penneyeugene: The type of...

    150115-0844 EST

    penneyeugene:

    The type of light you want to dim is more important than whether to dim or not.

    An incandescent light bulb, carbon or tungsten filament, is nicely dimmable from...
  8. Thread: dimmers

    by gar
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    150115-0735 EST penneyeugene: As a general...

    150115-0735 EST

    penneyeugene:

    As a general statement a dimmer used to control lights does not increase input power consumption as you dim.

    A dimmer is used to either reduce average output...
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    150114-1620 EST electrofelon: An example...

    150114-1620 EST

    electrofelon:

    An example that possibly is an illustration for one of your questions.

    A CNC machine is fed from a 240 V delta wild leg source 3 phase panel. Neutral and EGC...
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    150114-1154 EST I suggest your reasoning is...

    150114-1154 EST

    I suggest your reasoning is incorrect. Fundamentally there is a thermal problem.

    Most chemical reactions occur more rapidly as temperature increases. Most materials deteroriate...
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    150113-2144 EST With a sine wave input I get...

    150113-2144 EST

    With a sine wave input I get the following results:

    Beckman 4410 true RMS in AC mode 3 db point is about 80 kHz.
    Fluke 27 average reading type in AC 3 db is about 130 kHz.
    A...
  12. Thread: Drive question

    by gar
    Replies
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    150113-1023 EST kwired: What does the...

    150113-1023 EST

    kwired:

    What does the voltage to frequency ratio have to do with thre operation of a rectifier and capacitor input filter?

    .
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    150113-1018 EST A 2 meter 25 W transmitter...

    150113-1018 EST

    A 2 meter 25 W transmitter with the antenna in close proximity to a Leviton GFCI did not trip the GFCI.

    .
  14. Thread: Drive question

    by gar
    Replies
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    150113-0910 EST My guess is that the input...

    150113-0910 EST

    My guess is that the input circuitry of the VFD is a rectifier followed by a large capacitor. This means the DC bus voltage will be proportional to the AC applied voltage. Probably...
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    150112-2414 EST I thought I might find a low...

    150112-2414 EST

    I thought I might find a low PIV breakdown and I tried two grossly different LEDs and with a 100 k current limiting resistor and 28 V from an an adjustable power supply neither one...
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    150112-2149 EST If the LEDs are simply an LED...

    150112-2149 EST

    If the LEDs are simply an LED with a series current limiter, then they should not be fed AC. An LED is basically a diode. This means it conducts with a fairly low voltage drop in...
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    150112-2117 EST I vote for the subpanel. This...

    150112-2117 EST

    I vote for the subpanel. This provides 240 if needed, ease or resetting breakers (use QO), and voltage drop. In my home I have a main panel and 5 subpanels, very convenient, not...
  18. Thread: dimmers

    by gar
    Replies
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    150111-1739 EST My guess is that most Lutron...

    150111-1739 EST

    My guess is that most Lutron dimmers have a mechanical switch.

    When that switch is open the dimmer will draw no current whether it is a 2 or 3 wire dimmer.

    If the switch is...
  19. Thread: dimmers

    by gar
    Replies
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    150111-1409 EST If the load resistance is a...

    150111-1409 EST

    If the load resistance is a tungsten filament light bulb, and you use a series resistor to adjust brightness, then as brightness is reduced the total input power will be...
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    150111-0927 EST Suppose you want to make a...

    150111-0927 EST

    Suppose you want to make a 1500 W heater using copper wire.

    Assume a vertical plate 120" (10 ft) by 16" (1.33 ft) can dissipate 1500 W with a temperature rise of 50 C in free...
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    150110-2032 EST Time limit. Edited version....

    150110-2032 EST

    Time limit.

    Edited version.

    150110-1614 EST

    aarena:
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    150110-1614 EST aarena: When you provide a...

    150110-1614 EST

    aarena:

    When you provide a reference to something specific that I should look at, as you did in your first post, then provide sufficient information that I can easily find the...
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    150109-1448 EST Smart $: On page 31 you can...

    150109-1448 EST

    Smart $:

    On page 31 you can find the 7 mA specification.

    .
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    140109-1422 EST To get rid of the several...

    140109-1422 EST

    To get rid of the several watts dissipation with a shunt resistor, then the following could be used if you really believe that current is the only criteria in determining whether...
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    150109-1347 EST fifty60: You make it very...

    150109-1347 EST

    fifty60:

    You make it very difficult to communicate with you. And very time consuming for us to get information.

    Instead of pointing us directly to where the information is...
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