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    digital pid temperature controller

    Well, could be wrong to some degree but "dead wrong" insinuates on all fronts. Go ahead and build some and see if you can re-cover your costs.....let alone make any profit from the venture. Too easy these days for people who want a certain thing is make their own. (cheap as chips too)...
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    15kDCV low current power supply?

    12v car ignition coil.....older kettering style perhaps.
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    digital pid temperature controller

    Get onto one of the online pcb manufacturers who will have free software (e.g. EasyEda) to design your circuit diagram and from there generate a pcb layout. The gerber files are then uploaded to the manufacturer who makes and delivers at least 4 boards for a couple of dollars plus whatever...
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    Hoping to ID this connector for LED array power supply

    4 pin mini din plug....similar used on Flysky FS-i6 trainer leads etc.
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    An old Akai Tv

    Don't know of any TV that would directly connect to any satellite. Usual is via a set top box from the satellite dish and connect to TV AV or similar.
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    Does anyone know the pneumatic equivalent of an electrical capacitor?

    What....your Google broken..??
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    433MHz Transmitter Range Problem

    At thr risk of repeating myself, these units will have very little reliable range, perhaps 20 or 30 metres at best and then on a good day. If you want range of 100 metres or so use LoRa modules. You will get no better range with the nrf24L01 mentioned above. They do have a higher(amplified)...
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    Is Electrical Engineering Hard? 【Facts】

    You will definetely get some negative kickback from that particular statement........
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    Is Electrical Engineering Hard? 【Facts】

    Any career worth it's salt requires hard work, not just electrical engineering.
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    220v leg isolation

    Start there and get the correct one....pretty basic stuff....seems you start at "x 101" and only ever get to around 10.
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    Ultrasonic trans/rec transducer support hardware

    Any online supplier...Ebay, Amazon, Aliexpress.....not familiar with Google then ...??
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    5v to 3.3v input on pico

    Most of these sensors are open collector so did you use a pull up resistor on the signal line? All seems user induced to me.
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    Ultrasonic trans/rec transducer support hardware

    Thought about the Arduino HC-SR04..?? All done in a package for a couple of dollars. Tranceiver, promini, 5v supply and a bit of code (mostly already written a thousand or more times) done.
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    My son's toy car exhaust sound :)

    Well, that could mean sound level, but I took it to be accelerator frequency/speed. Silly me.:oops: Perhap Op should be more specific.
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    A relay polarity switching circuit needed..

    Don't think so......schematic you show relies on one transistor removing bias from the other. Most relays don't care about polarity or bias levels only pull in voltage/current. Futhermore, bad idea as relays will not react as you expect over a certain frequency.
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    My son's toy car exhaust sound :)

    Easiest and possibly cheapest is, forget the throttle and use a simple $20 bluetooth speaker coupled to a phone or whatever. Seen some rather small units used in model trains and output is surprisingly good for such a small device.
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    how to go from one power source to many power sources

    Without any requested details on just what it is you are trying to achieve, your percepted "dilemma" is out there with the fairies.
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    Controlling battery heat?

    And the list goes on and on....... o_Oo_Oo_O
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    My son's toy car exhaust sound :)

    Google. For example here........ https://www.youtube.com/@TheDIYGuy999/videos or just buy one from an rc store.
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    Mains quick testers.

    Voltmeter is and would be one of the meter requirements to check voltage but also a megger to test for minimum isolation/ insulation resistance both to ground and between primary and secondary windings, and for good earth on input and casing. The tests for all the latter would be more important...
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