I just realised how hard it would be to manufacture this thing.
Imagine having to bend those copper wires into that shape around an already-existing toroid ring. Or maybe they glue together a few pieces of ring?
WaterWaiver
joined 2 years ago
Rotational symmetry :) EDIT: Wait no the paper! Arrrgh
It's 50 bucks though. Too expensive of a date for me.
In the picture are 3 coiled wires, all sharing the same dark grey ring/toroid (but it looks yellow because it is wrapped in yellow kapton tape).
If you try and send the same signal through each of these 3 wires then they will all fight and cancel each other out (a bit like 3 people trying to through the same narrow doorway at the exact same time; no-one gets through). If the signals are different on each wire then they will get through fine (a bit like people going through a door at different times).
common mode chokes = choke/kill the signals that are common/same on all wires
You typically do not want common mode signals to exit your device and travel along cables, because then these cables act like radio transmitters. The exact reasoning for that is a bit more than I want to write here, but it's best explained with some pictures and phrases like "you turned your cable into a monopole you doof, use more common mode chokes and think of England".
Internally these devices work using magnetic fields in the dark-grey (ferrite) ring. I'm more familiar with 2-wire chokes where the coils are wound in opposite directions (so the magnetic fields they make cancel out), I am not sure how it works for 3 windings.
Microchannel coils: Wow. I assumed the pressures were too high for such construction to succeed. Thankyou :)
Fluid metering: I was aware of TXVs and capillary tubes, but not reverse bypass piston inserts. Would these options only be a few dollars difference in BOM price between each other? I guess the extra labour from soldering more pipes and connections for a TXV might be more costly than the extra materials themselves.
A vs N folded coils: interesting. I have mostly seen split systems and their unfolded coils, not central AC units with these A & N folded coils.
heat pumps instead of traditional compressor based ac systems
Heat pumps are compressor based systems. They are the same technology.
In addition to advances in fin design and compressor and motor efficiency and materials
This reads lot like an answer from an LLM. Did you use one? My apologies if not, but you sound very suspicious.
Definitely. Absolute scams. They deserve the "0 energy stars" ratings I've seen printed on their boxes.
My family bought one of those for one of my grandparents. On a 35degC day it was only able to cool the room by a few degrees and it was still humid inside.
Converting them into dual-hose systems would be so simple (almost free) to the manufacturer, but instead they rely on deceiving buyers with a promise of something that is not delivered.
it would be interesting to know if the hole is connected right through to the barb or not
I feel very uncomfortable with the thought of probing this thing with long metal rods whilst looking down the end.
maybe hint it to police
I guess I could try and send them the pics and ask them about this "suspicious object". Hopefully it's just a bong.
(I can't quite see it being an arsenic cannon, but yeah I wasn't planning on trusting my copper oxide assumption regardless xD)
I was going to reply with "you can't use barbed fittings at high pressures", but I looked it up and found some claiming 150psi (10 atmospheres). Huh. Perhaps this did start life as a hydraulic cylinder that has had some parts lopped off.
Not sure what the tube is filled with, but it looks like a lot of corrosion.
I don't think it's built up corrosion. The pipe is steel and corrodes to red/brown iron oxide, as visible around the circumference at the end. The green colour in the filling is not an iron oxide. It might be a copper oxide, or some dye in the white material.
Hmm. I admittedly don't have experience here, but I guess that makes sense.
I'm not sure how you would attach an elbow to a barb fitting though. A rubber pipe is usually used on these (but that would then burn/melt).
Is plaster of paris usually used to make bongs? I've only really noticed plastic bottle ones in the bush. I guess plaster will survive burning things better than plastic, but it's also porous.
The rough (frit) glaze surface would be the opposite of what you want in a HV bushing, because they would wick and store conductive water.
Interestingly it's on the both the top and the bottom. Perhaps this high surface area makes it more compatible with some specific glues; allowing you to stack a pile of these pieces together to make a full bushing? That might also explain why there is not hole in the middle, this could be a compression style bushing stack for holding wires up in the air off a surface.
63
The Lost Powers of Childhood: "James, don't trust the adults, look at what they've been hiding from us!"
(aussie.zone)
The real reason we warn kids to stay away from the tracks. It turns out that confectionery is cheaper than gravel in some parts of the world (and resists water erosion better because of the wrappers). Sadly they didn't anticipate anthropomorphic erosion events such as this leading to extended rail line outages.
Once the secret was out it became a nation-wide phenomena for kids to raid the tracks.
Railway engineers have been attempting to address this problem by tweaking the infill composition. A recent experiment involved infilling with only licorice, however it turns out some kids still like it. Local newspapers claim the railway engineers were quite confused by this result.
On the right the girl's hairdo reveals she had a recent near-miss at one of these railway digs. The adults now keep an eye on things -- if you pay close attention you will notice that there is actually an adult (or at least teenager) in this scene. Analyse the image closely and you might spot it.
An aspiring railway engineer at the top of the sketch, wearing blue, is pointing out a flawed sleeper. Either that or he's making a fat joke about one of his friends sitting on it.
The dirt desire-paths around the tracks show that locals regularly walk this line. Maybe it's safer than you think? These kids might not have been the first to raid this spot (how did they lift the sleepers?), I suspect the adults cracked it open sometime last night. Usually rail workers cover these sites with a tarp and signposts within a day of reporting.
Prompt: "The lost powers of childhood. Group of children in a park next to a rail line, discovering flaws in the world. Chocolates are everywhere." Generator: Bing DALL-E
Just some kids enjoying the outdoors. Someone must have split a pinata. One of the human kids is helping his aquatic friends get some of the chocolates.
Kids are kids and there's enough chocolate to share. It's the parents you've got to be worried about. "Hanging out with warmbloods again Rexy?" "No he can't visit later! We're going. Now.".
I guess the true power of childhood is not fearing new people. A 5yo family member of mine once got lost in the park, it turns out she had joined a random birthday party (and no-one had blinked an eyelid).
Prompt: "The lost powers of childhood. Group of children in a park next to a rail line, discovering flaws in thez world. Reality is tearing apart and monsters are streaming in, stealing the chocolates." Gen: Bing DALL-E
Prompt: "Mk II Austin 1800 competing in the London to Sydney Marathon. Driver has long grey fuzzy beard and steam is coming out of his ears." Gen: Bing DALL-E.
The drawn car is nothing like an Austin 1800 (but possible some other Austin model instead)
I promise I did not ask for the Australian to be captured and then wrapped (blindfolded?) with a flag. That was purely the interpretation of our inter-cultural antics by the model.
Prompt: "Confused American trying to communicate with Australian" Gen: Bing DALL-E.
Not sure if this is something the community here has interest in.
A section of the creek bank has fallen away, revealing that all of the soil has been recently deposited (~ last few decades). The garbage inclusion likely spreads for dozens or maybe hundreds of cubic meters of earth. We don't want to disturb the soil to clean this out so we're limited to surface level cleaning.
On the flipside: it's lots of deep fertile topsoil. The fast growing weeds, like lantana, absolutely love it.
1
Australian Border Force raid home in Sydney’s south amid reports nuclear isotopes found
(www.theguardian.com)
So many CMCs seem to be marketed based of visual appearance and hope. I guess maybe people already have a design that works, so they go for things that look like clones visually? Otherwise I don't get how anyone would choose their product when there are alternatives with actual specs.
Another gripe: When the only datasheet available is a combined one with tables and graphs listing the specs of dozens of part variants. But yours isn't on there. So you find two similar models in the list and mentally interpolate between the graphs whilst worrying whether or not this is a long-term supply item or some spares that a retailer is selling off from a custom order run.