Simplest and cheapest possible noise generator circuit

Hi all. I'm pretty novice with circuit design, but starting to learn. (and brushing up on everything I've forgotten!)

I'm working on an art project where I need to build up about 30 circuits that will, when connected, just make a noise. any old noise. in fact, the messier the better. It really doesn't matter at all what it sounds like, just needs to make a sound.

Can you folks help me come up with ideas for the simplest (and cheapest) possible circuit to do this? Is there a way that I can just introduce a single component with a battery and speaker that will fluctuate the current enough to buzz the speaker?

Thanks!

 

of course, now that i'm thinking about it, I may as well just have one speaker and then each of the circuits that are being connected running in parallel.

that would work, right?

another aspect of this is that the connection will be happening with the current running through a person - with a performer touching two different items to complete each circuit. so i suppose that will provide something of a variable resistance element? i'm hoping that that will vary the tones coming from the speaker.

all ideas/thoughts are most appreciated! thanks!

 

Hey, thanks! So - you think I actually need to buy buzzers for this to work? Or, perhaps one buzzer with one speaker and then, as I just posted, have the additional circuits running in parallel to that?

Thanks lots for the advice.

 

Yes. You're right. I just mean sound. ANY sound.

 

Great, thanks!

So - what if I follow this, but instead of the 56K resistor I use the parallel circuits that will go to the body?

 

Awesome. Any way you can see that I could simplify this?

 

Oh! Sorry - I should have gone back to this earlier. This oscillator circuit actually does look even simpler and I could try just replacing the resistor with the parallel connections similarly.

OR - I was also wondering about just using a buzzer, hopefully finding one that the tone will vary depending on the resistance.

I'll play with all this stuff and let you all know how it pans out if people are interested.

I'm also concerned that I know that bodies have high resistance, though I'm willing to cheat it by running a wire right next to the contact point if necessary.

Thanks again.

 

Yep - you're right. I'll just try a 555. Also maybe play around with buzzers to see what might be good in this piece.

Thanks again.