Is it possible to design a small / compact, hand-held siren (i.e. with a loud hooter), that is battery powered and fits into something like a 3"x3"x2" box ?
The requirements in more detail:
Hooter that is small, yet loud enough (not sure in decibel level terms, but something similar to what one finds in Residential Intruder Alarm systems).
Can operate off battery power (e.g. 2-3x 1.5VDC AAA cells) s.t. a. Hooter can sound a pattern for about 10minutes b. While circuit, which includes a NO/NC latching push-button switch, requiring "push" detection, can operate for few weeks (if not months).
The conflicting design constraints in my mind are:
- Small / cramped space that this whole thing needs to fit into
- Hooter loudness and duration required (knowing that these things draw a lot of current, and typically operate on 12VDC)
- Everything running off small (size and number of) battery pack.
The requirement of few AAA's instead of say LiPO is to keep the cost as low as possible, and keep things simple (i.e. to the extent I can deal with electronics).
Happy to elaborate and clarify, and very happy to have alternative suggestions. Note that the use case is, someone presses a big-round button (not sure what it is called, but the type you find in lifts, and in industrial controls that start/stop conveyor belts etc.), on a small hand-held box (no wires, self-powered), when they are in distress, and it makes a hell-raising racket to draw attention.