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    High Voltage Direct Current

    As a side note, New Zealand used to have/ may still have around 600klm HVDC distribution line. Details of advantages etc. on Wiki.
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    Unavailable small AC motor components

    Suggest new advisor, noise suppressor yes, commutator spark reduction, no.
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    Basic Announciator

    And then there is the 3 position switch with floating pins....
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    Basic Announciator

    Lack of any switch debounce could also present a problem in the current circuit.
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    Usage of BEC on a PRI Pico drone

    Don't see why not. Directly from the data sheet for Rasberry Pi Pico W ........ Raspberry Pi Pico W uses an on-board buck-boost SMPS which is able to generate the required 3.3V (to power RP2040 and external circuitry) from a wide range of input voltages (~1.8 to 5.5V). Imagine you need to watch...
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    Philips TV no power 22pft4031/05

    You will not get correct readings on components in circuit. Forget the suspect diodes etc until you can at least pull one leg. Where do you get AC voltage from...???? Be careful what you use as a common reference, it could either be lethal or completely misleading. I suspect, as you have no...
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    Custom circuit board to control sound, lights, and movement?

    Quick learner on Arduino.....advise you expectations expand for a possible longer results time.
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    Knife sharpener internal fuse

    Thermal fuse would be available from just about any electronics supplier....for example Mouser.... Here is one at Aliexpress......(actually 10 in a pack) https://www.aliexpress.com/item/1945718228.html
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    Know of a good reference book for electronics?

    TalkingElectronics....more free books/information than you will know what to do with. Wish they would have been around when I was starting out.............:) https://www.talkingelectronics.com/te_interactive_index.html
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    Custom circuit board to control sound, lights, and movement?

    Many ways to achieve what you want. Complexity would be in the detail only you currently know.
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    LCD voltmeter for my power supply

    And just what was it that started your concerns...??
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    Amplifier SMPS died mid play

    Yup, that certainly helped I don't think...... all that from a photo of a surface mount blown resistor..
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    Simplest BJT configuration for a SPDT, single pole double throw switch

    Doesn't make any sense...........
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    Amplifier SMPS died mid play

    Spec sheet says anything from 1.25v to input minus 30v......... shouldn't be too difficult to put a multimeter on it ad see what it actually is. If in the above range, forget it as a problem. You're looking for a fault that blows mosfet resistors......
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    Amplifier SMPS died mid play

    As I already mentioned, removal will be difficult without damaging the pcb traces. These boards are invariably made with lead free solder and the traces suck all the heat out of the soldering iron if you try to remove the device. You "might" manage to get one device leg up, but chances are the...
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    Amplifier SMPS died mid play

    That would be almost an impossibility without damaging the board traces.
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    Amplifier SMPS died mid play

    Be a good start....should get some test indication of any short in-circuit..........that plus the switcher ic.
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    Arduino pin to switch around 140ma?

    Which Arduino...? 7 segments per digit(possibly 8 with decimal point) ......... 20mA each....... however you have 1k so 5mA per.....??
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    Oven circuit board's buttons(bake broil etc )sometimes do not work when hot.

    Look for your local electrician or tv repair man (or similar) Tactile switches are available online, anywhere....... need to measure the size of the base and the length of the button.
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    Oven circuit board's buttons(bake broil etc )sometimes do not work when hot.

    Too add to #4, use plenty of flux either in any reflow or replacement. Chances are board was made with lead free solder and don't take well to simply reheating the joints. Use perhaps 1mm resin core 60/40 solder and a good iron as well. https://www.ebay.com.au/itm/203862725811 Good solder wick...
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