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    9 LED UV disco light - remote control issue

    Antenna points to it being some form of radio signal...... Either way, no way of knowing what is used to control it. Live with it as is or bin it.
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    Motorola components ID help

    Might have better luck trying to find a manual for whatever model the organ is.
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    G plan elevate chair remote help ?

    make photos smaller.......
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    convert 110v dc to 110v Ac

    Solar systems use low voltage (12-36) circulating pumps. 3 m head max. withstand 100 degrees.... Google shows plenty of alternatives.
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    Repurposing LED torchiere LED light - 12V or 24V

    It'll be a current limiting driver not a dimmer. You've more than likely blown the whole shebang now.
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    My first circuit is a bit advanced (H-bridge!)

    do some reading, and then do some more, plenty here....... http://www.talkingelectronics.com/te_interactive_index.html
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    Voltage Drop after optocoupler.

    Goto #10, would save a lot of bother if you provided the details you have there. Arduino shield conclusion doesn't seem correct.
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    Need help desoldering

    In my experience with motherboards, it's the heat sink from traces and vias that disallow heat flow of the solder. As an experiment to proove it, get an old knackered board and cut away a component by cutting it's leads. Then see how you go removing one device pin at a time. Some will remove...
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    Technics digital piano SX PX 336 CMOS batteries?

    Show a few photos might be a good starting place. See if the photos can show any details written as well.
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    Mini reflow oven advice

    Doesn't appear to be any temperature control and even if it did, cannot imagine it regulating too well. Think you'd have a band of heat the shape of the heating element whatever that is and may not be at all suitable. I would have thought an indirectly heated enclosure with fan circulation would...
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    Automotive Warning light help

    Ever seen a bucket/container on the floor of a boat during bad weather...??? never moves, only in the movies. For a switch element, use a pnp transistor. The reservoir will have sufficent damping already in place.
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    Please help me calculate wire temperature due current

    Then sit back and watch as either it has been though of yonks ago or some kid from an underdeveloped country copies it and floods the market with 20 cent copies.
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    Please help me calculate wire temperature due current

    I would have to doubt that one strand from a speaker wire flex would be between 1 and 2 mm thick........... more like around 0.2mm
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    Never seen this before... have you ?

    No but as usual, Google does. Transcription disc. https://en.wikipedia.org/wiki/Phonograph_record
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    Does anyone know what this is?

    Once again , it will be for current limiting at startup.
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    Quooker PCB short circuited

    They (both plug and socket) will be oem parts.
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    Newb needing guidance on 3-phase service.

    Never seen a secondary as a delta arrangement. As the neutral in a star system is for the imbalance, or for a standard single phase arrangement, where is the neutral supposed to originate in a delta output.? Can you show a typical supply authority example.? Your claims don't add up, especially...
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    Does anyone know what this is?

    May also be a current limiter for startup.
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    Quooker PCB short circuited

    What makes you think there is anything blown on the control board? From the looks of it , it's been a bad connection on a high current load that has taken out a connector. That in turn appears to be driven via a relay (output drive is isolated from the other pcb coponents) so my guess would be...
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    Newb needing guidance on 3-phase service.

    The transformer was meant to show supply authority distribution.
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