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    Artificial Intelligence---What is the Hardware Behind it?

    You have much more to worry about than the above. As a species, thinking as AI, which one would you pick to eliminate because of threat to your existence ? Wars, destructiveness, financial implosions, pollution, ruinous environmental attacks, unbridled resource consumption, stupid...
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    I need a wiring diagram!

    A very simple approach is use block language on an Arduino Nano board. And use it to drive the relays to switch the loads. This has advantage that pushbutton is debounced. Here is example I think would work : This is mBlock program, free. You drag and drop the blocks into right hand...
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    I need a wiring diagram!

    Power on considerations :
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    I need a wiring diagram!

    https://www.homemade-circuits.com/single-push-10-step-selector-switch/ There are quite a few videos on youtube on relay logic..... Some possible help ...
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    Two LM7805’s

    Your only concern is power up sequencing of parts, to avoid CMOS latchup of parts. So that I/O pins on parts spread across the 2 regulators meet their respective power up constraints. https://www.ti.com/lit/wp/scaa124/scaa124.pdf https://www.analog.com/en/resources/app-notes/an-1311.html...
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    Switching between two arduinos to drive an LED rope (novice question)

    Using Tuniot to do the block code the second core is quite straightforward. Arduino IDE has examples as well. Not rocket science. But to your point Multitasking has its own considerations, like a developer using interrupts for the first time..... Overkill, I think 2 Arduino boards overkill. But...
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    Switching between two arduinos to drive an LED rope (novice question)

    ESP32 have dual core versions, real HW multitasking, might be an option.
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    Two LM7805’s

    Using two regs gives you the full protection each reg has, eg Thermal, short circuit. A simple boosted reg does not have full protection.
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    Low power state of charge measurement of a battery (used to be Hello friends)

    What is the necessary sampling rate for the measurement. the frequency you want to the measurement ? And the accuracy and resolution of the measurement you desire ?
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    Oscilloscope tektronix TDS3034 & TDS3FFT

    Have you tried the forums at groups.io, there is more than 1 you would need to register at ? Firmware discussion here - https://www.eevblog.com/forum/projects/tektronix-tds3000-oscilloscope-modules-tds3uam/
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    Oscilloscope tektronix TDS3034 & TDS3FFT

    Did you follow the installation instructions ? https://download.tek.com/manual/071094402web.pdf
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    Using 2 C005 Timer modules for an on-off timer switch, alternatives for timing, low power?

    App info and precautions for the CD4060 - https://www.ti.com/sitesearch/en-us/docs/universalsearch.tsp?langPref=en-US&nr=23&searchTerm=cd4060#q=cd4060 Keep in mind the 4060 osc. accuracy, RC based, is very poor over T and V due to part tolerance, drift, the Vth of the inverting gates used for...
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    Using 2 C005 Timer modules for an on-off timer switch, alternatives for timing, low power?

    Micros down to 4 cents - https://jaycarlson.net/2023/02/04/the-cheapest-flash-microcontroller-you-can-buy-is-actually-an-arm-cortex-m0/ Regards, Dana.
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    Axial C testing

    Picture of cap ? With markings.
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    Arduino & DFPlayer mini noise.

    Recommend add the diode, see notes :
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    Arduino & DFPlayer mini noise.

    Picture of the breadboard and circuit connections layout. Possibly a schematic of interconnect between player and Arduino. Do you have a scope so you can look at signal lines/grounds/power distribution ?
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    Bad display on Dell Latitude c600 - need sugestion from a video recording

    Since you get a good initial BIOS boot screen display, possibly reset bios. maybe it got corrupted as part of the cable disconnect..... Remove bios battery for a couple of hours and reinstall. Typically its a coin cell battery.
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    Help Identify PJ742K chip

    This guy quite effective repairing LapTops and his training videos with simple tools. Part marking https://smd.yooneed.one/code504a.html#google_vignette Post a pic that shows more of the board area surrounding that chip, maybe some clues there.... Regards, Dana.
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    How does a TRIAC work??

    There is a discussion in this : https://www.worldradiohistory.com/BOOKSHELF-ARH/Technology/GE-Books/GE-SCR-Manual-4th-1967.pdf More Triac info here : https://archive.org/search?query=triac&page=2 Regards, Dana.
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    USB port to usb c

    There are functional differences :
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