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    Connecting two different power sources together

    Well if you have no intention of supplying sufficient information then it is near impossible to say.
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    Connecting two different power sources together

    You will need to provide a more detailed sketch of the entire arrangement. No good providing a small section and then shifting the goal posts whenever a suggestion is made. Using a 30 pound contactor on , for arguments sake, a 30,000 pound motorhome doesn't seem to high a cost to me at least.
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    Need Help in which is correct way to connect load to controller outputs

    Solenoids are either on or off, no pwm.
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    Connecting two different power sources together

    Changeover relay/contactor.
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    Lora module in weatherproof box and antenna outside.

    By doing that your antenna is essentially over 30 ft in length, so no.
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    Testing Caps for Outside Foil w/ Tektronix 465

    As you don't have hours to spend, did you do a google search, I did. Don't see what help it is knowing though.
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    VOLTAGE REDUCTION TO OPTIMISE STEP DOWN TRANSFORMER

    Is that under any load or just floating? Transformer will always have a higher output under no load, especially smaller units.
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    Shredder rewire - 230Vac motor with four wires

    The motor is a basic series motor. Power comes in through one field coil, then through armature , back through other field winding to the supply neutral. So first in to field start, finish to armature, out armature to other field finish and start to neutral. This field relationship must remain...
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    outdoor (Aqua) weather power points contain moisture, dirt and rusted screws

    No, it's the unsealed cable entry that is of primary concern as I have already told you. Those little covers do bugger-all and best to seal up instead with the abovementioned silicone.
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    outdoor (Aqua) weather power points contain moisture, dirt and rusted screws

    Not only the seals on the screws but the massive great unsealed cable entry at the rear. Too late for this fitting but when the new unit is fitted, all these points should be sealed with non-acid silicone sealer. It is possible whomever installed the current unit, sealed around the complete...
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    Any courses or youtube where I can learn to read complex electronics schematics and drawings?

    Circuit diagrams are , for the most part, made up of a combination of basic circuits. Understand how they work first and work from there. After a while one starts to recognise the layouts and see what is a more complete picture.
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    Old 'travel adapters'...

    These are modern day units, switch either way up or down. https://www.ebay.com.au/itm/353649460589 Probably like this...... without the +- though, I think that is just for connection start/finish etc.
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    Continuous measurement between two points approximately 2.5m apart

    I don' t see which points are 2.5 metres apart.....
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    PWM Controller Guidance

    Part of the problem with low end performance is there is no feedback to compensate the low end speed. Either use a more complex circuit with feedback of some description or use a gearmotor running at a much higher speed.
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    Oddball electric fence charger.

    Electric fences do not need a ground wire run around the perimeter as such. Just the isolated line. Usual approach is to drive an earth stake at the unit and connect ground there. Voltage is high enough and current low enough not to need a perimeter ground wire.
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    Best Motor Option for an Arduino Controlled trolley

    You are going to have to work ork a LOT more in relation to your trolley. For example, wheel size ......bearing type (is it ball bearing or just wooden wheels with a wood axle ..ie. heaps of friction) Hard as opposed to soft tyres. Can the trolley be moved by an external winch for example or...
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    Best Motor Option for an Arduino Controlled trolley

    When you are trying to calculate how much power is required, time comes into the calculation. For example, your 150kg weight going up and incline of 15 degrees, one needs to know how far to calculate the work required. When you have to do that work in a certain time, then there is the power...
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    Managing parallel loads in 12v circuit

    Shouldn't be too difficult to do even with trial and error. You could use for example an rc servo in place of the solenoid, or in fact a small wheel retract unit. If you do a search for trafficator you will find more info. Just don't go trying to buy a second hand one, the price will astound...
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    Managing parallel loads in 12v circuit

    Yes, I remember Dad's "Rolls Royce", a six eighty Wolsley had them. I think early VW might have as well.
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    Selecting a MOSFET

    Drive your mosfet gate via a small properly biased transistor from the micro 3v3 output.
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