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Mobile phone screamer? Answered

Has anyone got a schematic or instructions for making a noise generator I can attach to my cell phone through the mike/earphone jack? I am getting a lot of "junk" calls with faked return numbers, who will not remove me from their call lists and typically call 3-5 times a day, even at night. My provider (AllTel) says there's nothing they can do to help me block calls with bogus or "unavailable" return numbers. OK, I admit this is more for my own sense of justice than anything else, but I'd sure like to have some sort of oscillator that would generate enough volume at a high pitch to at least give them a nice headache.


In the modern times, cell phones have become an essential part of our life. You will be out of fashion if you have no cell phone. One hand, you can send massages and make phones to your friends or your colleagues with phones at any time in any places. On the other hand, we will enjoy our life with it, such as listening to music, playing games, taking photos, recording a vedio, suffering the internet, etc. But more and more people are using cell phones at the expense of public interest. They talk aloud over the cell phones, the endless ringtones sounded everywhere. How to cope with the noises of cell phones in public has drawn public attentions in many places of the world. Do we have to force ourselves to listen to the noise generated by cell phones? Of course not, Cell phone jammer is a useful tool for us to deal with the noise pollution.I have bought one for my convenient life, so if you have the same problem with me, you can come to this place http://www.jammerall.com/ to get one. You will find the cool of it.

You could try a dial-up modem.

Thanks, but I'm looking for something a little more portable. I've got diagrams of noise generators using 555 chips but I need to be sure the output isn't going to damage my phone.

Hmm, I am not sure how things are where you are at, or how the phone system is worked, but here in the USA, any non-FCC approved addition to the phone line must have strict controls attached to it. Isolation of power source is one biggie.

That isn't hard, just required. A battery as psu and an audio transformer between the device and and phone connection itself will suffice most of the time. This way you can guarrantee that only audio is going into the line. Do you know what I mean? Using one of the noise generators you mentioned, you can isolate the circuit using the audio transformer, but still get the audio into the line.

I understand - that's not an issue. It's my CELL phone they are attacking, so there's no danger of damaging a hardwired leased line - only my own phone. I've got to admit, I haven't kept up with electronics - lost touch after the transistor took over (seriously - my last majro project was a three-TUBE radio ;o). And I've never worked with audio transformers, at least not enough to know what I should be shopping for. Also, the circuits I've seen don't seem to provide any means to AMPLIFY the noise. I'm not saying I want to blow out anyone's eardrums, just discourage them from calling. And it doesn't HAVE to be a 555 - those are just the only "ready-to-build" curcuits I've found online. I remember when a super-simple oscillator circuit was made with an electromagnet...well, that was old days, and much lower frequencies than I want.

It's my CELL phone they are attacking

Ooops, sorry about that. That will be harder to make automatic. If all you need is a device to create the noise and want to manually answer and press the speaker to the phone, that would not have too detrimental an effect on the phone (I wouldn't think anyway). Of course, that is a bit of a pain too.

I've been known to take one of those air horns that people take to football games and give repeat tele-scammers an earful.

Ah, yes - but then I'd have a lot to explain to my neighbors, co-workers, etc....

Of course, that is probably the simplest solution :-)

Of course, if people always took the simplest path, I'd have considerably less entertainment.

Ah. Then I'm the wrong person to ask. :)

Are you sure they are not simply computer initiated calls? If so, your noise will go unheard. It is ODD that your provider does not offer the service where you have the other party supply a "real" phone number, before you will except the call. Sounds like a reason to change providers to me :-)

They are almost certainly computer INITIATED. I sometimes get three in the space of a minute, from the same fake number. If I answer, though, I'm routed to a person who then tries to sell me fake prescription medicines and wants a credit card number (of course). When I ask them to stop, or say anything else that doesn't sound lime a sale, they simply hang up - and call back. The noise generator is for activating AFTER the computer-generated dialer routes the call to one of htese thieves. I don't actually believe it will stop the calls, but it will give me some personal satisfaction. These a-holes were calling late at night when my mother was near death before she passed away a few months ago, and I couldn't turn the phone ringer off for fear of missing an important call. I would love at least token revenge...sorry of that's "not nice", but the animals I'm dealing with have no souls, the phone company refuses to help, and even the government agencies I've contacted (about offering hydrocodone, etc. over the phone, stealing credit card info, etc.) seem uninterested.

The noise generator is for activating AFTER the computer-generated dialer routes the call to one of htese thieves.

I understand now.

When I ask them to stop, or say anything else that doesn't sound lime a sale, they simply hang up - and call back.

Ooo, in the USA, that is known as harassment. And it is sad that you can't get any help with this matter. :-(