4 ms·

I would like to find some reasonably prices screamers to use. You plug them in, they charge an internal battery for a short time, and then they let out the lou

I would like to find some reasonably prices screamers to use. You plug them in, they charge an internal battery for a short time, and then they let out the loudest scream that is allowed by law. They are charged up so they continue to scream once unplugged. Put a few in different areas around work and wait for the magic to happen.

jessaustin 11y ago
This would be great fun when crossing a border into a nation that allows its agents to do bad things. Or when one has access to the coat or laptop bag of someone about to cross such a border.
AUmrysh 11y ago
I've been looking for a project to learn PCB design with... you may have just given me the perfect starting project with that ( ͡° ͜ʖ ͡°)
- Lawtonfogle 11y ago
  For a more advanced one, have it yell curses instead. Or something really embarrassing/horrible.
  - leohutson 11y ago
    Porn sounds would probably work best.
- bsder 11y ago
  Careful. This is a deeper rabbit hole than you think it is. Screamers are 100db+. To get that you have to drive a piezo at about 100V near it's maximum resonance point and engineer the case to create a resonant cavity. To generate that voltage, you're likely going to need an autotransformer. And nobody stocks these off the shelf--they're a custom order magnetics part. (If you find a better circuit topology or a place that stocks the appropriate autotransformer, do please let me know.) Of course, if you just want a wimpy beep, there's lots of options. :) But if you want something offensively loud, you're going to find that there is more engineering here than you think. It's a good project, but it isn't "easy". http://www.picbasic.co.uk/forum/showthread.php?t=16855 http://www.picbasic.co.uk/forum/showthread.php?t=16855 http://www.instructables.com/id/How-to-make-an-Arduino-driven-Piezo-LOUD/ http://www.instructables.com/id/How-to-make-an-Arduino-drive...
- keithpeter 11y ago
  Wouldn't have to be producing spl in the 100dB range (see comment below) just 80 to 86 would provide a salutary lesson. I'd take some.
nkurz 11y ago
I misread your design the first time I read it, but I think the misinterpretation might be an interesting alternative. Instead of screaming a few seconds after being plugged in, perhaps it should silently charge whenever plugged in, and then scream only when unplugged. The only way to silence it is to plug it in again, or smash it to little bits. If you are having fun with anthropomorphic social engineering, you might even have the scream be a loud but plaintive "Help me! My batteries are dying! Plug me in, plug me in, find the nearest air gapped computer and plug me in!".
- spydum 11y ago
  This is both brilliant and sick. A psychological virus which guilts you into spreading itself. Bonus points if it can identify you already plugged it into the specific machine and keep yelling until it finds a new parasitic host!
Zuider 11y ago
Or perhaps a heating element that would unleash a sulfurous, unfragrant, rotting cabbage stench. The simplest thing that could possibly work.

jessaustin 11y ago

This would be great fun when crossing a border into a nation that allows its agents to do bad things. Or when one has access to the coat or laptop bag of someone about to cross such a border.

AUmrysh 11y ago

I've been looking for a project to learn PCB design with... you may have just given me the perfect starting project with that ( ͡° ͜ʖ ͡°)

Lawtonfogle 11y ago
For a more advanced one, have it yell curses instead. Or something really embarrassing/horrible.
- leohutson 11y ago
  Porn sounds would probably work best.
bsder 11y ago
Careful. This is a deeper rabbit hole than you think it is. Screamers are 100db+. To get that you have to drive a piezo at about 100V near it's maximum resonance point and engineer the case to create a resonant cavity. To generate that voltage, you're likely going to need an autotransformer. And nobody stocks these off the shelf--they're a custom order magnetics part. (If you find a better circuit topology or a place that stocks the appropriate autotransformer, do please let me know.) Of course, if you just want a wimpy beep, there's lots of options. :) But if you want something offensively loud, you're going to find that there is more engineering here than you think. It's a good project, but it isn't "easy". http://www.picbasic.co.uk/forum/showthread.php?t=16855 http://www.picbasic.co.uk/forum/showthread.php?t=16855 http://www.instructables.com/id/How-to-make-an-Arduino-driven-Piezo-LOUD/ http://www.instructables.com/id/How-to-make-an-Arduino-drive...
keithpeter 11y ago
Wouldn't have to be producing spl in the 100dB range (see comment below) just 80 to 86 would provide a salutary lesson. I'd take some.

nkurz 11y ago

I misread your design the first time I read it, but I think the misinterpretation might be an interesting alternative. Instead of screaming a few seconds after being plugged in, perhaps it should silently charge whenever plugged in, and then scream only when unplugged. The only way to silence it is to plug it in again, or smash it to little bits. If you are having fun with anthropomorphic social engineering, you might even have the scream be a loud but plaintive "Help me! My batteries are dying! Plug me in, plug me in, find the nearest air gapped computer and plug me in!".

spydum 11y ago
This is both brilliant and sick. A psychological virus which guilts you into spreading itself. Bonus points if it can identify you already plugged it into the specific machine and keep yelling until it finds a new parasitic host!

Zuider 11y ago

Or perhaps a heating element that would unleash a sulfurous, unfragrant, rotting cabbage stench. The simplest thing that could possibly work.