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Loud speaker driver.

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priestnot

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Hello I have to drive a speaker / piezo to play a siren tone as laud as possible.
But I am running into some problems.

The first one is that I have a piezo and for it to be lowder I have to apply to it a square wave with at least 24Vpp.

The thing is I am making the square wave using a NE555 and I have a power source of 12Vdc.

Is there a cheap way to make the square wave to be generated with -12V to 12V or 0 to 24V?
 

i think making sq wave with NE555 is the cheapest and best solution
 

You can run your circuit from 24V and use a regulator for the 555. On the output, you can have a driver stage to give you output swing between 0-24V. The circuit below shows the general idea.
 

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  • 555_drv.gif
    555_drv.gif
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E-design said:
You can run your circuit from 24V and use a regulator for the 555. On the output, you can have a driver stage to give you output swing between 0-24V. The circuit below shows the general idea.
Click to expand...

The circuit must run with a 12V source. Its a requisite.
 

Ok, then you can do something like this below. You connect the transducer (between VF3/4) so that both ends can swing between 0 and 12V but 180° out of phase. Instead of keeping one end tied to 0V, both ends can swing, thus effectively giving a delta swing of ≈24V.
 

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  • 555_drv1.gif
    555_drv1.gif
    24.3 KB · Views: 53

E-design said:
Ok, then you can do something like this below. You connect the transducer (between VF3/4) so that both ends can swing between 0 and 12V but 180° out of phase. Instead of keeping one end tied to 0V, both ends can swing, thus effectively giving a delta swing of ≈24V.
Click to expand...

I cannot see any circuit...
 

It is there, so don't know why you can't view it.
 


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