WaterWaiver
@WaterWaiver@aussie.zone
I once met a person that never drank water, only soft drinks. It’s not the unhealthiness of this that disturbed me, but the fact they did it without the requisite paperwork.
Unlike those disorganised people I have a formal waiver. I primarily drink steam and crushed glaciers.
- Comment on Questions about the insides of this optocoupler (TLP250) 2 weeks ago:
Triangle is an amplifier and rectangle is a black box (“don’t worry what’s in here, we promise it’s not gremlins”).
I suspect that the box might be a biasing array for driving the two output transistors, but then I would also expect two wires to come out of it (one for each transistor) rather than a single combined wire.
Broadcom’s datasheet for their version of the part seems to be more akin to what I’m thinking:
Could be either. You’d have to decap the chip to find out, the datasheet writers thought these details were not important.
- Comment on Pretty part of the week: Ruishen RSCM11548 3-winding common-mode choke 2 weeks ago:
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.
- Comment on Pretty part of the week: Ruishen RSCM11548 3-winding common-mode choke 2 weeks ago:
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?
- Comment on Pretty part of the week: Ruishen RSCM11548 3-winding common-mode choke 2 weeks ago:
It’s 50 bucks though. Too expensive of a date for me.
- Comment on Pretty part of the week: Ruishen RSCM11548 3-winding common-mode choke 2 weeks ago:
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 wires, because then these wires 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”.
- Submitted 2 weeks ago to electronics@discuss.tchncs.de | 14 comments
- Comment on A couple of community requests 3 weeks ago:
Chux Baku, I didn’t think I was doing much :)
AusTransport sounds nice. But what happens to the old communities, to avoid people using those? I don’t know if it’s possible to lock them and leave a notice, or unlist them somehow?
- Comment on As a novice at soldering, I now have an opinion about single-sided vs. double-sided breadboards 2 months ago:
Probably double-sided prototyping PCBs. The double-sided ones tend to be green (FR4 fiberglass resin), the single-sided orange (FR2 paper phenolic-resin).
Terminology varies, a lot of greymarket sellers use “veroboard”, “prototype board” and “breadboard” interchangeably.
The glue between the copper pads and the board itself tend to better with the double-sided boards, I agree with you OP :) Although this isn’t universal, I’ve had some nasty bare copper boards on FR4 where the pads pop off when you try to solder to them; and some old FR2 boards with really well adhered pads. I’ve read somewhere that this might (?) be due to moisture in the PCB boiling off when you put the soldering iron to a pad and that baking the board in an oven first can help, but I have not tried that. I suspect a lot of it comes down to the quality of adhesive used between copper and substrate.
- Comment on Customers suddenly find their new phones can't make calls or send texts 2 months ago:
I hesitant to say that this shouldn’t affect you. I’m sure that somehow, somewhere, Optus still managed to ruin your day. Hope it resolves SynopsisTant.
- Comment on NBN Co to accelerate higher speed tiers and launch multi-gigabit speeds in September 2025 3 months ago:
There are no changes to the nbn wholesale pricing of these speed tiers arising from the speed increases.
Interesting, however, are there not other fees and prices that need to be paid by the ISPs? ie it won’t be the same price for end users?
I am suspicious that they only talk about wholesale, not end user, pricing. They’re not directly responsible for it but they would have modelled it and then decided not to mention it in this article.
- Comment on Timeout errors in last few days 3 months ago:
Ditto three. Pages hanging too.
Lots of gastro cases in NSW the last few weeks, maybe server has it too. Make sure to take plenty of fluids.
- Comment on Opened an old scientific instrument to see if it works... 3 months ago:
I would recommend rinsing the vinegar away with water instead. It’s already completely dissolved, but the baking powder might not be if you add that undissolved. You don’t want to leave anything behind.
- Comment on Coles' and Woolworths' alleged land banking comes under the microscope, $30 million more given to watchdog for crackdown 4 months ago:
It’s not land banking. It’s land investment. We’re making the land better, more luscious, stronger.
- Submitted 5 months ago to australia@aussie.zone | 5 comments
- Comment on What are your favorite Nintendo 64 games? 6 months ago:
Perfect dark has a PC port that’s really good. I couldn’t stand it on console (low fps made me motionsick) but it was a hoot when I played it on PC.
- Comment on Long Centrelink wait times as 11 million calls go unanswered 6 months ago:
or simply inconveniencing them though
Screwing. 100% screwing.
An inconvenience is not being able to get someone on the phone in minutes or hours. Screwing is making someone spend days, weeks or months trying to get you on the phone and navigate a system that’s supposed to help them, not hurt them.
My dad isn’t at pension age yet and has been struggling the last few years whilst being a full time carer of my grandmother. It has often taken days to weeks of calling to get through and weeks to months get things approved.
Whereas, there are so many services we have that are for ACTUAL emergencies, and require fast service, where the money would save lives.
You have this so backwards.
Centrelink saves lives. Support saves lives. Welfare saves lives.
If you don’t support people then they end up having to use the emergency services. Is it cheaper to support people before the need emergency services rather than after.
- Comment on The Raes say their fridge malfunctioned, triggering illness, and their refund offer included a 'gag clause' 6 months ago:
Most modern domestic fridges stick with a plain hydrocarbon refrigerant anyway (akin to butane) these days.
I’m yet to see R600a in Australian domestic fridges, I thought we were lagging in that department? Can you just get them at retailers now?
if you’ve got burning refrigerant there are much bigger problems going on seeing as the refrigerant circuit is hermetically sealed
Inhaling burning fluorine compounds > fridge not cooling any more.
- Comment on The Raes say their fridge malfunctioned, triggering illness, and their refund offer included a 'gag clause' 6 months ago:
Could be burning refrigerant (some are flammable AND fluorinated).
- Comment on Fake job ads waste applicants' time and harm their wellbeing. So why are companies posting them? 7 months ago:
Sorry to hear you’re feeling crap.
I’m having trouble looking for work for the past few months. Very few replies, the first “no” I got actually made me feel a bit more human.
I’m convinced that some of the jobs I’ve applied for or enquired about are not real or just for external-advertising-before-hire requirements. I’ve gotten some rude responses after daring to ask questions (eg: jobs funded by research money tend to have fixed funding start dates that might not be for another several months). Most straight up ignore me.
An old boss of mine thinks that my CV isn’t conforming and mundane enough, so I’m giving his suggestions a go.
What sort of work are you looking at? I design electronics and get into arguments with computers.
- Comment on Lemmy 0.19.4 7 months ago:
I have some uploaded image problems.
(1) The Lost Powers of Childhood is missing an inline image upload on the first post (“Bonus: in this…”). I think this might have occurred before the upgrade, I recall having to look for it a week ago, but I’m not sure.
(2) The new Profile -> Uploads page has lots of odd gaps:
It’s not showing some images I’ve uploaded, eg this MSY catalog screenshot isn’t listed there.
- Comment on Petition to establish and enforce consumer protections for digital software. 8 months ago:
SAAS isn’t a one-off purchase, it’s a rental with ongoing rental fees.
- Comment on Media Release: The Bureau issues a warning for a G4 geomagnetic storm 8 months ago:
Little do you know that I’m secretly in charge of the
BureuaBureuaBureau. I believe https should be a premium feature that valuable customers will pay for. - Comment on Media Release: The Bureau issues a warning for a G4 geomagnetic storm 8 months ago:
Corrected, thankyou. I blindly took the page title.
- Comment on Media Release: The Bureau issues a warning for a G4 geomagnetic storm 8 months ago:
Do geo storms affect up into the GHz where wifi sits? I can only find material talking about the ionisphere and frequencies up to HF :|
- Submitted 8 months ago to australia@aussie.zone | 12 comments
- Comment on lovely video, absolutely batshit idea: portable magnetron 8 months ago:
His other videos seem interesting too.
- Comment on Stop Killing Games: Petition EN6080 - Define & enforce consumers' ownership rights for digital software 9 months ago:
I love the wording of the petition:
functional state after the end of the product’s support period, continuing to operate without any intervention from the publisher.
This completely circumvents the garbage argument that it costs money to keep software running after a certain date. If a car company claimed that letting their cars continue to work after 5 years would cost them money then we’d laugh at them, but when a software company claims that we tend to trust their magical knowledge and experience.
- Comment on Nerd Update 20/4/24 9 months ago:
$ swapon /
- Comment on Nerd Update 20/4/24 9 months ago:
I’m a bit confused by the upside-down negative swap graph. Does it say that the server is eating up to 5GB of swap, but restarting lemmy each night only returns that to about 2.5GB of swap? What’s the swap monster?
- Comment on Designing an efficient LED array 9 months ago:
Yes it’s possible to run them without resistors if you put them all in series and use a current limited power supply. That’s how some LED lighting products do it, just not common LED strips.
Common LED strips are designed for convenience over efficiency. You feed them 12V and you can cut them to any shorter length without worry. You can’t do that with series configurations.
and a constant current supply will suffice for several strips of series LEDs in parallel.
Yes and no. I’ve seen lots of series-parallel products fail with blown LEDs.
For parallel LEDs to work you need three things:
- Very well matched LEDs.
- Shared heatsinking, so one LED getting hot shares some of its heat with its neighbours.
- Reasonable driving level. The more power you put into the LEDs the worse it gets.
These 3 things cost money so they often get skimped.
The LEDs will end up in an autonomous greenhouse where power efficiency is important.
Removing the resistors of a white 12V LED strip will (at best, in theory) increase your efficiency by 25%.
Choosing to use more LEDs and driving them at lower power levels might increase your efficiency even more than this. In 2024 you should be able to get well over 100 lumens per watt, but many LED strips overdrive the LEDs, dramatically lowering their efficiency. LED light output versus power input curves are very nonlinear, you get decreasing returns of light the more power you put in.
autonomous greenhouse
What are you growing? Sounds suspicious. Please don’t do anything illegal.
If your greenhouse is anything larger than a small test then please instead proper fire detection and suppression systems. Don’t get people hurt.
