Inside the tiny Cavius smoke detector. 

anonymic79 Just use your cell as an alarm with a file with some kind of misic or sound that would span your needed range.

Wow makes sense thank you very much for your time bye take care 🍄💋🍄💋

Good point TE, but even for a 1kHz square wave, the harmonics are 1/3 x 3kHz, 1/5 x 5kHz, 1/7 x 7kHz etc, and get progressively quieter so less 'alarming'. For high frequency square waves, only the first few harmonics are significant. All square waves with a fundamental above a third of the frequency of your hearing bandwidth sound like sine waves because all the harmonics are filtered out. eg, if you can't hear above 2kHz, then all you would hear is a 1kHz sine wave because all harmonics would be inaudible, if you're not in a standing wave trough. Smoke alarms have to cater for as many people as possible, not just those with average hearing. ( I did a postgrad in this stuff years ago )

I recall a TV news story couple years back where they showed teenagers,who love loud music, 8 out of 10 slept through the beep beep beep ones outside a closed door in hallway, they tested a multi tone style the night after, and 10/10 woke up

Which is why when my smoke alarm battery needed to be replaced, I couldn't figure out where the noise was coming from, because it did a single ultra quick single tone beep for what seemed like some interval between every 60 minutes, so it was impossible to locate where the sound was coming from, because it was in another room. If it had done a sweeping sound, or at least several beeps in a row, I would have figured it out instantly.

Yours needs to meet mine. Seems their cooking strategies are broadly similar (Madame believes in making SURE there's no risk of us contracting food poisoning . . . . . :-) )

You can get heat detectors for kitchens. They either detect a sudden rise in heat or trigger at a preset threshold if it rises slowly

Our kitchen detector's already rate-of-heat-rise. Pretty essential when El Presidente cremates most things . . . . :-). I'm the one who sets the hallway detector off (by forgetting to turn the toast-duration control of our toaster down, when switching from fridge bread to fresh rolls!). Really annoys our Parrot - who's very willing to try to "out-scream" the detector!!

Also the TT gets quite a bit of attention.

I'm pretty sure I saw one episode of a TV show set on the Isle of Man. It wasn't great. That's about my level of exposure, other than Clive.

Even outside the "TT Bedlam", the IoM is a great place to visit. If you're a bike fan - there are a number of Tour Companies "over there" which can provide accommodation, and a guided ride of the circuit. Very interesting, and you gain a great respect for the lap times achieved by the "professionals".

The IOM is a beautiful place. I went to the Laxey wheel and to the top of Snaefell a few years back. Great views!

May possibly wake deep sleepers better than a constant frequency alarm, but who knows..

Will also be heard by people who are pitch deaf to specific frequencies. No alarm should be a fixed frequency.

In most areas of the US code now requires a low frequency square-wave sounder in sleeping areas. Apparently studies show this is most effective to wake deep sleepers.

Or they liked the alarms used in Star Trek.

Very reasonable, especially when you consider that a "square" wave is a big collection of sine wave harmonics.

I remember the old tungsten smoke detectors. The lamps in them did sometimes fail, but by that point they were probably so dusty inside (helped by thermal airflow effects) that they had served their purpose.

www.ebay.com/itm/Vtg-Old-Mid-Century-Electric-Fire-Alarm-Smoke-Detector-Gold-Vanguard-SmokeSonic-/122229515200

Amazing? I've never once had any problem fitting the largest smoke detector I've ever used, where it was supposed to go, and using a standard, cheaper alkaline battery (as a backup to mains power). Cavius tiny smoke detector seems to me just like a foolish overly expensive way to get the same thing done = anti-progress. Reinventing the wheel with no clear advantage and only higher cost, is just pandering to idiots. However, I did enjoy watching Clive analyze it, though he uses the word "basically" far too often. ;) I suppose we all have words we overuse.

I watched 7 minutes of video and didn't hear him say "basically" even once.

@@stinkycheese804 Another advantage is the wireless on some models - so if one unit detects smoke, it makes them all sound. Great for modern houses with soundproofing.

Am 4yrs late but its not a bare dice in the vid of the manufacturer its a freescale mcu and a opamp package

"Alexa, reset smoke alarm." this is a great idea with no possible repercussions whatsoever.

Nest had a similar "bright idea" - with earlier models you waved near the detector to shut it off in this scenario. Apparently though it was a little over-sensitive and could disable itself unintentionally. I think it perhaps demonstrates that you have to be extremely careful when "innovating" around what is meant to be a safety device.

And then there will be people like me, who (rightfully) wouldn't trust fire alarms with goddamn voice recognition.

im pretty sure first alert made them first, and labeled them as the atom, then cavius rebranded it

Only when her skirt catches fire.

She sets them all off, where ever they are in the world...

Ellen Madden The battery life will depend on the environment and the frequency of false triggering that occurs.

PsychoticBovine, they are sold in the US as First Alert Atom

I found them, but was trying to be funny.

Uptick? It's foolish to overpay for a smoke detector just because it's smaller than it needs to be. They're all effective if considering major brands. Idiots and their money are easily parted. If it were a portable device, by all means smaller is better. Building mounted permanent smoke detector? Not at all, there is nothing better about smaller. There is nothing clever about making something as small as possible then deceptively marketing it to idiots who can't grasp what the important attributes about a product are. That's just dirty marketing and disrespectful. On the other hand if this were a carbon monoxide detector and put in hybrid vehicles (AS ALL SHOULD HAVE NOW!!) then the small size and weight have a clear advantage.

Some people like to make their place look nice. This might match someones decor more than a cheap dollar store/Pound Land lump sticking out of their ceiling.

Stinky Cheese it isn't just small. As mentioned, it's one of the few smoke detectors that make a sweeping beep instead of a constant tone beep. This means that 1. people with frequency sensitive deafness are more likely to hear it 2. You are more likely to hear the alarm it as the sound is less likely to be affected by destructive interference 3. It is a more distinct sound that is more likely to attract attention in a fire.

They're not very expensive and do look significantly less ugly than the usual design. If I didn't have mains powered detectors, I'd get these.

Stinky Cheese he already said he got this on the cheap (less than 10 quid)

Markle2k I haven't tested my smoke alaŗm in 15 year's!

Gillenz Fluff I've never tested mine...lamb chops do that for me :)

The 10 year spec is actually a good idea. Ionization detectors fail after 10 years, and folks do not realize they are putting new battrries in dead drtectors. Requiring a matching 10 year battery means no chirps in the night every year, and ensures the whole thing will be replaced on schedule. (Dust blocks the ionization path after 7-10 yesrs typically.) Yes, I have had them fail to go off during a real fire, because they were simply too old.

You are twice as likely to die in a fire in your house without a working smoke detector than if you have working detectors.

Markle2k - I like the part about "an infinite source of 9 volt batteries to their tenants"

It can see a very fine haze that you might not see. Or you may have a rate of rise temperature alarm right above the oven area?

I can't see how. The smoke alarm in my bedroom can't see the oven. But I think your theory has some merit. I've wondered if it's being set off by a heat pulse, because the smoke alarm takes a few minutes to go off. Rather than looking at radiative heat, it might be seeing the pulse of hot air going into my bedroom.

He's got a bunch of vape-related videos, just search for it on his channel page. This feature is kindof obscurely located, so here: i.imgur.com/6VqtOuE.png

Moon Moon They work with witchcraft, I tell you, witchcraft!

I thought it was Imps?

I agree. I have a 500KG pull 3" diameter N52 magnet and it really does have destructive potential. Got to keep away from literally everything electronic, any metal structures, magstrip cards, etc. And skin being typically flexible and flabby, loves to get pinched in between surfaces all the time.

ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-6dyMwAToYVk.html For those interested, here is a scharfenberg coupler in action, the wing-type things at the sides, are the electromagnets. Here in Australia they work a bit differently. Coupling trains together is fully automatic, you nudge the throttle just a little bit, just to get the train moving, it will continue rolling and the magnets energize and pull the two together. Once this happens, the coupling mechanism itself locks into place, and electrical and data connections are made automatically on more modern trains. In this case, the two computers on both trains start talking to eachother, to determine what the other train is, and any fault logs and whatnot are synchronized between the pairs, this is so the driver at one end, knows of any faults that might be at the trailing end. Here in Queensland, every passenger train is fully electrically compatible with every other train. Meaning, a train built 40 years ago in 1979, will couple with, and talk to, a train built in 2006. While this is not done in service, it's a handy procedure to return a few trains to the depot with one driver. It's not uncommon to see 12-car trains, consisting of four 3-car units, to be running together, headed somewhere. One driver is in control of all 4 trains, and it doesn't matter which end you drive from. Because they are electrically compatible, the old end can lead and be in control, or the new end can do that, whichever direction you need to run, the train being driven, will control the rest. The couplers actually have quite a lot of play, they're not a fixed, rigid object. Being in the middle cab of a two-unit in motion, there's a hell of a lot of movement in all directions. While coupling is a fully automatic process, decoupling is a tad less so. In the cab, to decouple a train from another, it first has to be stopped, mechanical interlocks will not allow you to decouple a train in motion, which makes sense. There are two buttons, sometimes the second button is actually a keyed switch. You have to either hold both buttons down for several seconds, or turn and hold the keyed switch, and press the other button. The coupling mechanism unlocks, the magnets de-energize, and the couplers that snapped into position before, retract slightly, allowing you to leave the other train behind. Electrical and data connections, are, handily, automatically ceased during this process. I'll stop babbling on now, I've gone from talking about something barely featured in this video at all, to a completely different topic. I'm too damn good at that...

Moon Moon - thanks for the info mate! I found it very interesting. I live for these little technical pearls of wisdom.

+Martin Willett A well placed one.

With a studio apartment (one room combining bedroom/living space/kitchen) there is no placement that makes a smoke detector not be a bacon alarm. The proper method is not burn food.

Our (upstairs) smoke detector was a broiled chicken alarm until we learned to put some water in the bottom of the pan under the chicken so the drippings wouldn't smoke.

I would ALWAYS set of my alarm with bacon, until I started cooking it under the grill. It gives a lot less smoke, plus the bacon cooks more evenly :D

My old one was an "Aargh! Bacon! Aargh! Sausage! Aargh! Toast!" alarm. I was able to hold a lit piece of paper underneath it (with bucket to hand) and it was all "Yeah, and?" Took the paper back to the kitchen to extinguish it. "OMG! OMG! OMG! THAT'S NOT BACON!!!" New one behaves better (And has a mute button!)

+mikeselectricstuff It has a test/mute button. I've since seen a manufacturer's video that shows the machine putting on the black resin. There were what looked like an op amp and a processor in standard SMD packages and some other components. I think it's to protect the signal amplifier from humidity.

A hot air nozzle might have melted it.

Hey Mike, didn’t see much coming from your channel recently... are you taking a wee break? ... Loved your GPS BUOY video... All the best !

Oooh and the Gyro video!

Erm... 5:15

It's a very common technology in high output sounders. You can buy the bare disks, disks in housings or complete sounders from most electronic component suppliers.

Guessing he's been off work over Christmas.

I expect he had a day off.

yeah, holidays.

OTOH some of us only have so many hours in a day...

Please leave

Badum tish

Steam will trigger them.

It turned out to be covering the sensing circuitry to protect it from humidity.

A smoke machine will set off most smoke detectors. In theatres they have to either disable the system and have manual alarm operation during shows or fit rate of rise temperature detectors if haze or other atmospheric effects are being used.