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    Connecting a LED directly to a 230v isolation transformer

    Mains LED drivers these days (those encased within lamps) use a dedicated driver chip along with rectifier and other associated parts all mounted on a heatsink base. Quite an involved bit of technology available for a few dollars, latter due to mass production in some Eastern country or other...
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    Logitech z506 No Sound. It powers ON

    Good luck with that idea...
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    Logitech z506 No Sound. It powers ON

    Could be input problem....simple audio injector would be a useful tool...enty of places show how to make one.
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    POT burning/candle-like smell

    Get a 10k pot.......
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    Wireless doorbell chime - no sound

    Probably somewhere in the detail you didn't show.....
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    I'm seeing 5"-long caps marked "3000F"! Did they change label units??

    And can kill if not handled correctly.......
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    electronic following circuit

    Various forms of how to..... Check out here...... https://www.youtube.com/c/iforce2d/search?query=follow%20me
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    Lead acid battery minimum discharge level

    Saw this on a string of 40 series 12v batteries used on one of the hospital ups systems spilled out of the provided racks in a specially ventilated containment room and into the generator hallway for more capacity. Reminding of the dangers of the release of hydrogen gas in and around possible...
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    Connecting a LED directly to a 230v isolation transformer

    Mains connect LED not recommended at all. Led outer casing and therefore the AnodeCathode come out into the real world so to speak and if the LED blows, which is almost a given, mains live terminals will be exposed and extremely dangerous.
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    What is this called and where do I get it?

    Servo connector pins...Ebay, Aliexpress,
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    POT burning/candle-like smell

    Sounds like it's wired incorrectly to me....
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    Push-Pull Potentiometer Selection for Specific Electric Guitar Effects

    ....so you can identify how it is rather a difficult chore for anyone at this end...:)
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    Fishing bite alarm

    They are either an online web site (online editor..........edit online....on the web) where you can resize your photos or....... Paint, which is a program on every Windows operated computer where one can do the same. I'd never heard of a fish bite alarm and became curious........first video up...
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    Push-Pull Potentiometer Selection for Specific Electric Guitar Effects

    An actual circuit diagram would be the best approach at success as a long description usually results in some misunderstanding at least.
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    Beginners book

    Plenty of free books on talking electronics web site. http://www.talkingelectronics.com/te_interactive_index.html
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    Switching multiple lines at once?

    What are the signals..??
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    Interesting Power Supply Issue

    So show it......
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    convert speaker output to microphone input

    Pick up the signal well before the amp section, simple. That naturally depends on just what the signal is though.
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    Is this a transformer???

    Blurry photo is useless, best guess is a thing-a-me-jig.
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    DC Smoke Generator

    Not much one can do with an apparent error signal from the uC especially without any circuit details and one could be almost 100% certain that none would be available. Looks like a bin job if the obvious control devices are intact. Don't know how you managed to check the electros in place but...
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