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    LCD screen Identification/Replacement

    It is likely a screen layout that is particular to this device, not just any old LCD screen. Take as an example say an air con remote control display.
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    Resistor wattage confusion

    How did you determine the correct replacement transistor.? The way you wrote this, it appears like you replaced the transistor with a 3w resistor.
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    LCD screen Identification/Replacement

    Most likely oem device. Cannot see any display what so ever t0 verify but 99.9% it would be the case.
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    Sentrysafe

    empty socket partly obscured. Did you check the photo before uploading to see if it was clear and showed what you wanted....probably a good idea. Anyhow, appears to be 4 pin. However, important bit is ....................you will need to measure the pin pitch ................and the type is as...
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    AC motor question

    Edit:....(most likely)It will require a capacitor to start and run. If you have the model, one can possibly look up a basic motor connection diagram and from there which cabling arrangement for forward and reverse. Many dryers will run both directions (via switching) during the drying cycle...
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    Sentrysafe

    And just which connector in the photo are you referring to....????
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    Flow Switch for Gasses (such as Air, CO2 or N2)

    If you have a friend working in the sheet metal workshop somewhere, they usually have heaps of working flow guages off their mig/tig welders.
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    I broke my cassette aux adapter

    Show photos (clear and good size)...i.e. check them before you post them.
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    Checking Capacitor

    It's a mains rated capacitor available just about anywhere. I'd be concerned you don't know what it is yet you are playing around in mains equipment. Other than that, a capacitor tester would show it's value immediately. Most everyday multimeters have a cap test that would cover that cap value...
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    Searching for a potentiometer

    Four pins it's likely to be an encoder, not a pot.
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    Problem with ceiling led

    Nothing to see under the LED strips. Simply replace the whole innards with an LED kit such as below. https://www.aliexpress.com/item/1005004436839232.html?gatewayAdapt=4itemAdapt
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    need power supply station

    Plenty of coal fired one kicking around cheap lately......:D
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    How to drive a 12v 40w heating pad

    If the "transformers" you refer to are around 250mm long and rather heavy (the old iron core transformers) then you are ok. If they are the more modern switchmode type used for LEDs perhaps only half that size and very light, then forget it as they are current regulated. Best when you post to...
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    Solar panel equal/unequal siting

    If one series panel gets a shadow, all is lost. It's why consideration to panel placement is so important.
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    Controlling battery heat?

    If you are referring to the 9v smoke alarm batteries, they are low current devices only. 2 x 9V in series is 18v.............how many of these 3.6v 300mA lights are you running and how are they connected?
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    Lithium battery BMS

    Any static protection....... willing to bet not......:oops:
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    Nano microchip and circuits

    Obviously never heard of Tom Thumb.
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    Help needed

    Not so much the conversion as the difference in the charger required.
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    Didn't make a note of single subject in engineering, graduating soon what to do?

    In Aus it's called bulls**t.
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    First diagnosis steps, how to?

    Your query is too broad in nature due to the gazillions of electronics out there. Comparison.....I want to build a space shuttle but don't know where to start.
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