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  1. Replies
    25$$
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    267

    140417-2353 EDT fifty60: You are jumping...

    140417-2353 EDT

    fifty60:

    You are jumping all over the problem area without understanding the signals with which you are working and the problems of connecting together disassociated pieces of...
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    32$$
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    312

    140417-1420 EDT ardmi: GoldDigger has given...

    140417-1420 EDT

    ardmi:

    GoldDigger has given you good information, but you should have provided more complete information at the beginning.

    My heat gun is labeled 8.3 A and at 123 V after a...
  3. Replies
    25$$
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    267

    140417-1114 EDT fifty60: It is not a good...

    140417-1114 EDT

    fifty60:

    It is not a good idea to run TTL inputs over long open wires.

    If this is a non-critical application, then just see if shorting and opening the TTL input lead to its...
  4. Replies
    32$$
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    312

    140417-1025 EDT ardmi: Assume the heat gun...

    140417-1025 EDT

    ardmi:

    Assume the heat gun is a two prong device (no EGC), then it is likely that neutral or hot has alternative parallel paths that produce an unbalance current in the conduit...
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    32$$
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    312

    140417-1002 EDT ardmi: If you have a...

    140417-1002 EDT

    ardmi:

    If you have a conduit with some internal current carrying wires, this conduit and its wires go into a black box with some sort of internal load, and there are no other...
  6. Replies
    25$$
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    267

    140417-0856 EDT fifty60: Assume the TTL...

    140417-0856 EDT

    fifty60:

    Assume the TTL input is the best way to on-off control the power supply. Although you might switch the AC input power to the power supply.

    There should be NO common...
  7. Replies
    25$$
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    267

    140416-2037 EDT fifty60: Why did you ever...

    140416-2037 EDT

    fifty60:

    Why did you ever bring up 232 in the original post when apparently from post #4 your input control is a binary TTL input?


    GoldDigger:

    +/-15 is not a requirement...
  8. Replies
    25$$
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    267

    140416-1933 EDT fifty60: Define exactly...

    140416-1933 EDT

    fifty60:

    Define exactly what signal you require at the device you want to control. A TTL signal means a lot, but TTL alone still means much lacking information (for example is...
  9. Replies
    25$$
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    267

    140416-1612 EDT fifty60: There are devices...

    140416-1612 EDT

    fifty60:

    There are devices that can do what you want. You need to provide more information on details of the required shutdown signal?

    How serious is the result, if the...
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    7$$
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    163

    140416-1422 EDT drktmplr12: A practical...

    140416-1422 EDT

    drktmplr12:

    A practical application is an oscilloscope X10 probe. Nine megohms in the probe working with a 1 megohm input resistance at the scope. Also in combination with the...
  11. Thread: 500 ohm low-drift

    by gar
    Replies
    13$$
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    209

    140416-0800 EDT ptonsparky: Since your goal...

    140416-0800 EDT

    ptonsparky:

    Since your goal is to sense an overload there are several possibilities, and you don't need any high accuracy.

    Ideally you would measure power and not current. If...
  12. Thread: 500 ohm low-drift

    by gar
    Replies
    13$$
    Views
    209

    140415-2358 EDT Check Mouser ...

    140415-2358 EDT

    Check Mouser

    http://www.mouser.com/ProductDetail/Vishay-Dale/PTF65250R00AYEK/?qs=lapbQfCXP/WQLz7i/2%252biFw==

    Use two 250 ohms 1/4 W resistors in series. Note: 0.05% of 500 =...
  13. Thread: 25 OHMS RESISTANCE

    by gar
    Replies
    27$$
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    769

    140412-2445 EDT dereckbc: No way did Edison...

    140412-2445 EDT

    dereckbc:

    No way did Edison depend upon earth as one of his conductors. Just consider the impossibility of adding 25 ohms in series with his system load. His 1879 generators...
  14. 140412-2355 EDT The Consumer Reports comments...

    140412-2355 EDT

    The Consumer Reports comments and the testimonials are of virtually no use. Totally unscientific and there is no discussion of the operating conditions.

    The comments were...
  15. 140412-1244 EDT If there is no air flow around...

    140412-1244 EDT

    If there is no air flow around the bulb, then this may be the problem. What kind of fixture?

    See my posts #10 and #11 at http://forums.mikeholt.com/showthread.php?t=160447 .

    .
  16. Replies
    9$$
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    215

    140412-1128 EDT Disassemble one of the dimmers...

    140412-1128 EDT

    Disassemble one of the dimmers and see if it uses a microprocessor.

    .
  17. 140411-2136 EDT I ditto GoldDigger's...

    140411-2136 EDT

    I ditto GoldDigger's suggestion.

    .
  18. Replies
    3$$
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    162

    140419-1641 EDT bobby ocampo: Can you...

    140419-1641 EDT

    bobby ocampo:

    Can you provide more details on your application? Power, RPM, single or three phase, frequency, voltage, accuracy, dynamic or static, production or single-shot,...
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    16$$
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    664

    140407-0840 EDT Aweitzmann7: We need to...

    140407-0840 EDT

    Aweitzmann7:

    We need to know the exact statement of the problem, any specified assumptions, and any assumed assumptions.

    .
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    16$$
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    664

    140406-0543 EDT Aweitzmann7: Following is a...

    140406-0543 EDT

    Aweitzmann7:

    Following is a method that does not switch neutral, and is probably a valid solution given the very loose restrictions on the solution.

    Both hot and common...
  21. Replies
    16$$
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    664

    140405-2329 EDT Use two SPST switches. Run a...

    140405-2329 EDT

    Use two SPST switches. Run a neutral between both switch boxes.

    At light B and switch A connect hot to light B, and run a wire from the neutral side of light B to one side of...
  22. Thread: disconnecting egc

    by gar
    Replies
    5$$
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    190

    140402-2345 EDT I agree with the above...

    140402-2345 EDT

    I agree with the above comments for the most part.

    It is absolutely essential that a proper EGC be provided. It will also help if it is greatly oversized. A supplemental ground...
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    19$$
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    518

    140401-2343 EDT gdub0000: You are possibly...

    140401-2343 EDT

    gdub0000:

    You are possibly asking the wrong question as a starting point.

    If you want to know how much current at 240 V is required to supply a resistive load of 10.1 kW,...
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    19$$
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    518

    140331-2117 EDT gdub0000: What is the...

    140331-2117 EDT

    gdub0000:

    What is the internal wiring of this oven?

    If it is a Y configuration, then you have three 120 V heating elements.

    .
  25. Thread: RFI

    by gar
    Replies
    45$$
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    1,083

    140331-1302 EDT mgookin: Enter spectrum...

    140331-1302 EDT

    mgookin:

    Enter
    spectrum analyzer to laptop
    in Google.

    There may be one or more under $200 that cover 30 MHz to something higher. Whether the sensitivity you need is...
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