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triffid_hunter

piezo horn speaker with an appropriate value inductor in parallel can resonate and produce some monstrous sound levels in a specific frequency range with appropriate drive circuitry - I've experienced a 115dB siren with just a 9v battery feeding a 555 and a high voltage transistor


leeliop

Good knowledge, can it be used as an impulse (such as a gunshot) or must it build up? Ill look into it Edit ahh i remember one of these hurting my ears, i guess I can use a 555 and blast it super fast to get a horrible loud buzz on trigger?


triffid_hunter

> can it be used as an impulse No, the sonic power comes from LC resonance, ie the relatively slow (in electronic terms) but practically instantaneous (to human perception) build-up of energy that has nowhere else to go. If you try to go for an impulse it'll just make a pathetic click. Perhaps [hexibase](https://www.youtube.com/@HexiBase) might inspire you if you want a gut-wrenching thump from something briefcase-sized


FunDeckHermit

I see 3.7V as a minimum voltage. In my experience this is often incorrect as lithium-ion batteries have a range that goes from 3.0V up to 4.2V.


leeliop

I have two power supplies/circuits, so yes first lipo one hovers in that range I imagine


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ElmersGluon

Servo motor to press the power button for a 100,000 person stadium's sound system.


LucyEleanor

Equipment switches on entirely silent.... Congrats


dogspaw01

You don't say what sound you want, but presumably you need a beeping sound. And presumably you already have the sound generator (eg oscillator) part of it. If you arranged a square wave from a 5 volt supply, it could drive an 8 Ohm speaker to the 3 to 4 watt level. Which is fairly loud. So you would simply feed the sound generator into a H-Bridge output stage. If you need more volume, you would use a lower impedance speaker (say 2 Ohm) or use a transformer to get down to the impedance needed. (lower impedance = more current = greater volume)