Een test met een plaatje

Sorry some learning with the forum formatting:
#include <stdio.h>

Picture with electronics

Hmmm, one LED, three big transistors (BC108/109?), and three smaller (though I note the middle smaller has something written, but not clear enough to read).

I wonder what this does? Two wires (power, no doubt) plus a shorter wire. Given its length, some sort of antenna?

Please please please tell me it’s a thing you can dump in your backpack to silence mobile phones while at the cinema…! ;-)

I gather I’m not the only one to have thought of that device Rick!

Please please please tell me it’s a thing you can dump in your backpack to silence mobile phones while at the cinema…! ;-)

I think a lump hammer does that and it works on the owners too, but they’re a bit more squishy.

Messy. And liable to get you into trouble. And takes a while finding the culprit.

It’s also technically illegal to block mobile signals. But that doesn’t stop various hotel chains doing stuff like that to stop you using your own mobile as a hotspot in order to force you to use their exorbitantly priced offering…

Me? I’m with Steve. I nice solid hammer. Makes a statement.

But that doesn’t stop various hotel chains doing stuff like that to stop you using your own mobile as a hotspot in order to force you to use their exorbitantly priced offering…

Fortunately not the case with the EasyHotel I was stuck in, down in London, a few weeks back. I’m pretty sure blocking the 3G used by lots of people to stay in touch with corporate email etc. wouldn’t go well with the business in the neighbouring offices across the light well either.

It’s also technically illegal to block mobile signals.

Sure. Even more illegal to transmit a brief burst of a signal so powerful it fries the detector circuitry in a mobile phone. But far more unlikely to get caught out in than whacking people’s phones – or their persons – with lump hammers.

It is a sawtooth generator made up from if memory serves me right a discrete UJT transistor:

Don’t worry Timo, I didn’t (and I’m sure Rick didn’t either) ever think for a moment you were killing phones. Not really.

I’ve thought about it often enough, but never done it. And probably never would.

Well, maybe a sawtooth running at the right frequency…?

Seriously though, it is wish fulfilment. You’re sitting watching a film. The young mother to the right has finally stopped her little brat scrunching a bag of sweets, and…

… Something heavy like U2 or the Cranberries belts out, followed by a person who learned how to talk on a telephone by watching The Apprentice, which means they switch it straight to speakerphone and holding it on their palm at about a thirty degree angle and then shout at it. Because they fail to understand that The Apprentice is a parade of egotistical narcissists duking it out. I think we’re supposed to enjoy the failures and the backstabbing and the delicious righteousness of being smites (you’re fired!), not consider it an instruction manual…

Radio jammer or cricket bat. Either works for me.

Oh, I’ve always been more destructive than mere radio jamming. It’s detector-killing pulses for me. Camera flash circuitry to charge a big cap, then a tuned circuit designed to withstand a very brief pulse of extremely high power…you only use it at long intervals, so no heat dissipation problems…

I’m a bit surprised (off topic). Do people in the UK and in France really use their telephones in the cinema? Here in The Netherlands, where many things go wrong (islamophobia, management bulimia, tax paradise for the rich) people are requested to switch their phones off in any kind of theatre. Timo may prove otherwise, but my experience is that everyone here feels quite embarrassed when his phone suddenly rings during whatever movie.

Clive – that works? I’d have thought anything we could build would be vastly inferior to a nearby lightning strike.

Paul – they’re supposed to turn their phones off, you know, like they’re supposed to drive at 50 (30 in British) in towns… Doesn’t mean everybody does, and it only takes one pratt…

Rick: I’ve never tried it, but yes, it would work. Lightning strikes are very broad spectrum, they don’t have a huge amount of power in any particular frequency band.

You can take your phone right up next to an urban cellphone base station: the transmitter power is deliberately limited to avoid damaging phones. But don’t take it up close to the base station aerial of a rural one…

@Paul Sprangers. I can confirm that also in church. The islam is a discussion on its own.;-) . However the spectrum of sawtooth with the correct spectrum could jam cell phones. I heard from companies in the US who really do this.

But don’t take it up close to the base station aerial of a rural one…

I work right beside two mobile towers. I’m only seeing two out of four bars signal strength. I think they transmit in a sort of conical pattern so the phones close to it don’t get nuked.
As for the aerial, that’s like ten metres up behind a barbed wire gated enclosure. I’d be more worried about biological issues than watching my phone burst into flames.

I think they transmit in a sort of conical pattern so the phones close to it don’t get nuked.

That’s why it’s a good idea to put cells on the roof of schools.
But, of course, most people don’t understand, and protest.

… And yet nobody who advocates transmitters on school roofs seems happy to have one stuck on their roof… ;-)

Still, it won’t matter in a few years after we’ve all had Linky installed, the lovely little thing that periodically blasts out data in a method similar to CPL BUT AT higher power to go back up the electric wires, and built by the cheapest tender so they didn’t bother during isolation chokes to prevent this outgoing signal also being blasted around the household wiring.

As for the aerial, that’s like ten metres up behind a barbed wire gated enclosure. I’d be more worried about biological issues than watching my phone burst into flames.

Rural base station? Yes, much higher power. It’s only near the aerial, and indeed, in the transmission cone, that the power would wreck your phone. And yes, you shouldn’t put your body too close there, either.

But your phone can be damaged at signal strengths that won’t hurt a human body, if it’s just a brief, powerful pulse at the right frequency. The phone won’t burst into flames – all that happens is that the detector diodes fail. Same thing at lower (but still quite high) power over a somewhat longer period – still not enough to have much biological effect, but probably worth avoiding excessive exposure over a very long period.

@Paul Sprangers. Please no politics here.
Your stating islamophobia is wrong makes me wonder if you consider the opposite is the state-authorised way of thinking you want people to adopt, wich is, islamophilia.
Here in France we have this impossible concept to translate which is ‘laicité’.
Also please consider some people can be rather pissed off by the Bataclan, the Nice slaughtering, and more recently what happened in Marseilles.
I hereby ask the moderators to do their job and not let people like you emittting a political opinion where the name ‘islamophobia’ is the Goldwin point immediately reached for far deeper, complex, and serious issues, people have the right to be concerned about ; and which can’t be summed up as islomophobia.
Thanks in advance.

impossible concept to translate which is ‘laicité’.

Reverso translates this as “secularity” or “secularism” and gives examples of its use for non-French speakers.

Strangely it omits the examples if you try to put in the accents yourself!

This useful resource works in NetSurf, but only if you add the term to be researched in the actual icon bar – the entry field on the page itself  doesn’t  work.

Not to mention the complicated and often overlooked distinction that Islam (their interpretation) is one of the main reasons terrorists do what they do, but this absolutely does not equate to meaning that everybody who believes in Islam is a terrorist.
Labels are easy. Thinking is the hard part. Finding solutions? Damn near impossible… :-(

Please no politics here.

No – Aldershot is the place.

Islam carries terrorist values.
If you understand French, subscribe to ‘Aldo Sterone’ YT channels. He is a Muslim.
Several books have been written about that, and by Muslims.
Djihad is not only for the self, but also to battle against any non Muslim person (and not only in war times) to ‘bend’ and become a Muslim, otherwise he can be treated as an inferior, a second class citizen (paying taxes Muslims would not pay), and eventually killed (as it has happened in the past and yes that is proved).
Read the text, read the commonly admitted books about Islam, and open your eyes.
If you want to see and hear there are enough warnings just everywhere, with proofs, references to texts, texts admitted as being the right way to understand Islam : an entire system to rule the society and people’ behaviour. Full-in-one totalitarism.
And you cannot take parts of it and reject other parts : it must be agreed to as a whole. No discussion, and no novation.
I too thought it was ‘a religion of Peace’ and discovered it is absolutely not.
So this idea ‘Islamophobia’ is a bad thing … oh yes, the ‘bad’ is in the definition itself, that is so convenient.
The ‘fear of Islam’, which has had no reforms, is a very legitimate concern.
Btw Islam from Maghreb isn’t the true Islam, it is something else.
The texts (Quran) and then the way they have been explained are two separate things, oh yeah what a nice story, except the latter says yes to lapidation, yes to killing gay people, yes to slavery, yes to inferior status for females, and so on. Muhamet was slave buyer and reseller and the testimonies are not debatable about this fact, as they are given by several sources, all close to the Prophet (so you cannot argue and debate : it is considered as 1st quality info).
And everybody is supposed to live like the Prophet … see the ‘rather small’ issue.
So yes : you have the right to be afraid. And seriously afraid. It is your duty to be afraid and vigilent.
Now think whatever you want, it is happening now, your children are about to live in a nightmare world.
I have no kids, so well in a way everything can burn, but (believe it or not) being rather altruistic, I see we are walking on our heads. In my family some people fought during the last 2 world wars, and now we are about to lose without even reacting, like the frog in the boiling water.