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    Sewing machine speed controller repair

    You could try putting a test lamp on the load.(normal 120v tungsten bulb, say around 60W)
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    LED help

    The star led's do, if only smallish. One shown is just that only adjustable to suit the need.
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    Is it wrong to leave a transformer plugged in ??

    If one did this in Thailand, one would never have an electrical device. Mai phen rai ......
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    Small SMD Fell Off Motherboard

    Probably best to just leave it alone as you may do more damage than good. Generally if you follow the attached flowchart, you can't go wrong.
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    LED help

    Best to use a dedicated driver as with a resistor, any voltage change will make the current swing excessively. Not only that but large wattage resistors would be required leading to large energy losses. Video here explains some.......
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    LED help

    No, that is the color temperature. The numbers you quoted are around the warm white levels.
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    Hot rodding a cordless vacuum cleaner.

    Just be aware of the dangers of "playing" with these battery packs. Here is a quick video of a much smaller phone battery blowing it's top, just to give you some idea.
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    Is it wrong to leave a transformer plugged in ??

    Just realised you may be concerned with it continually powered up.(from a deterioration point of view) Not the best idea but then again, every tv, dvd etc etc have the same arrangement as far as power supplies go and people leave these switched on, idling for years on end. Would tend to dry out...
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    Is it wrong to leave a transformer plugged in ??

    This could mean many different things depending on your perception of wiring etc. In some countries it is illegal ...firstly to do your own mains wiring and secondly to install anything without required protection and an isolator of some description. Check with you local lecky .........best bet...
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    IR trans-rec

    diode and emitters here... https://www.ebay.com.au/itm/Infrared-Emitter-Ir-Receiver-Diode-10Pairs-3Mm-Led-Ic-New-xb/282909910638?hash=item41debea66e:rk:16:pf:0 hookup here......
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    IR trans-rec

    3v would be barely/if ever enough as the elements are rated at 2.7 to 5v operation. Transistor should be at the bottom. Here is a simple arrangement might save a lot of mucking around. https://www.instructables.com/id/IR-Proximity-Sensor-1/
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    Different in voltage of 3 phase

    Outside your house and mine as well but anyone's guess what the Op is playing with.
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    IR trans-rec

    Those particular units are modulated signal and will require a microcontroller such as an Arduino with appropriate code to work.
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    Hot rodding a cordless vacuum cleaner.

    seems to me like you are.......
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    Different in voltage of 3 phase

    No wonder this Op has the stutters......"RTYTYBTRYRTY" If those 400v levels are phase to neutral, what is the phase to phase level (1000V..??)
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    "TACT" and "EQUINOX"

    Sound like a couple of maxi yachts.
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    Hot rodding a cordless vacuum cleaner.

    The bigger motor may "fry" ( or rather light up rather spectacularly) your battery but it has nothing to do with shutdown and more to do with max current ability. Having said that, there may be components such as free-wheeling diodes on the board which protect electronic bits and batteries do at...
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    Amateur (Ham) Radio and RC (Radio Controlled) Flight

    Hop, Thought this might be of interest to you. Merry Christmas......Jorgo http://ardupilot.org/planner/
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    Help with generator problem? anyone?

    First thing would be to get a service manual. Then, depending on your ability, trace through the fault charts/trouble shoot guide to see if you can find just where the fault lies. Then, replace the offending parts. It is not normal these days to be able to repair many of these "modules" but...
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    Reflow Bga chip.

    Thought about this a couple of times also. Apparently the surface tension is enough if the process is done similar to the youtube video.
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