when a railroad engine wheel slips on a rail as it tries to move forward i can see sparks mostly going in the rear direction. while thinking about what might happen in other situations, such as a moving engine (being pushed by its massive 100 car load, perhaps), i came to a simplistic case that...
This is one of my thought experiments where I am drawing a big blank, If you have 2 objects approaching a 3rd object from opposite directions (just enough off to avoid collision) at 75% of the speed of light, the first assumption is that each observing the other would see the other object...
That would not be an issue on step-UP where the supply has an SGC/neutral. But clearly there is a complication if the supply has no SGC/neutral. I guess in such a case you don't get to use that exception since its requirement cannot be complied with.
No. Since the need for the step-down is...
They list only two ways to make such a transformer, yet there are three ways. The difference between these is that the grounded isolation method connects the neutral side (has the wider blade hole) of the 120 volt output to the ground wire itself, inside the transformer. It seems from their...
In a colocated rack cabinet supplied with ONLY 208 volt power, and a requirement to follow electrical codes that include not permitting NEMA 5 type power outlets with 208 volts on them, we need to supply power to a device that has a "wall wart" transformer with NEMA 1 type (North American flat...
No wires coming out except for the cord with the plug. There is usually one of those universal sockets, and maybe one additional one for North America.
Autotransformers are less safe for a couple reasons. One is that they depend on the including live conductors for ground reference, and in particular need to have the side that is common on "primary" and "secondary" (quotes because that's not exactly a correct terminology for an...
I see a lot of these transformers that claim to do both step-up and step-down in the same unit. At least one had a photo of the back side and there was a switch labeled to set it according to the input voltage. What I am curious about is how these are wired. Are they isolation transformers or...
The interference aspect is required to understand how adding voltage can result in the same perception of power as adding power.
Consider heat. Add the voltage and you get 4 times the heat dissipation in a resistor. But that's not the equivalent of adding a 2nd heater.
In USA, three phase to homes is rare ... more so than in many other places in the world. This is in part due to the way the lower 120 volt service is handled.
In many places where the distribution voltage is stepped down to a three phase system with 208/120 volts, homes will get TWO of the...
Not readily. Would have to order from one of those "220 appliance" places, or from EU (whoever can ship to USA w/o VAT).
I don't do the Ebay thing anymore. Too risky.
Oh, I did mean magnetic saturation of the core, too. I don't want a 50% swell to be distorted.
FM might be a workable method, too. That should not be too hard to "decode". But something that can give me a lot in a limited bandwidth would be good, too.
The smaller I can make the power...
Good idea. I was looking at some buck-boost transformers, as they usually have a pair of 120V windings for primary that can be wired in series. But those are typically well north of $100.
Something else I thought of are those voltage sensors people (especially electricians) get to detect...
Looks like a good idea. How can I verify that these devices do not include things that might alter the signal accuracy, like filters? Ideally a straight transformer with nothing added would seem right. I do want a wide bandwidth, at least to the Nyquist limit on my current sampling rate (48...