Alarm without circuit? Possible?

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ClouDxv1

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Hi, i need some help asap.
I wanna know izzit possible for me to do an alarm without designing a circuit to it?
I mean if i just provide power to the speaker it will sound.
A friend of mine suggest i use 1 thing called 'buffer' but i cant seem to find it in the net.
 

A speaker will only make noise with low voltage AC. If you want to use DC, e.g batteries, you need a piezo buzzer, they usually work on 3-12v and are very commonly available.
 

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    ClouDxv1

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the simplest circuit that came to my mind is a piezo buzzer, resitor, batery and a switch. If you what to do something like an alarm to detect when a door is opened or closed that is the easiest way.

https://www.futurlec.com/Buzzers.shtml
Some buzzer shown in the futurlec's catalog work within 3 to 28 volts.
 

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