here's the video

<snip>

 

NONE of the extremely cheap piezo tweeter links you posted has detailed spec's.
One speaker goes as high as only 4kHz on one paragraph but goes to 40kHz on another paragraph.
The last one might work if you tune the frequency to one of its peak frequencies but it will not be loud.

 

Is there another option you could link me to that will work and be affordable?
Thanks

 

I don't think anybody buys cheap low power tweeters. Therefore nobody makes them.
I worked with very high quality expensive sound systems.

I saw a 3-way speaker for cars. Its tweeter was just the photo of a piezo tweeter.

 

So what do you suggest I do? Or did you watch the video a conclude that it's not the speaker?
I'd like to try and order something to night so i can get it working properly
thanks

 

So what do you suggest I do? Or did you watch the video a conclude that it's not the speaker?
I'd like to try and order something to night so i can get it working properly
thanks

Your video does not work.

 

http://www.youtube.com/watch?v=Di0GZHW1qIo

alright, now try. Sorry for that inconvenience.

if that doesn't work, try this

http://www.youtube.com/watch?v=Di0GZHW1qIo

 

would something like this work?
http://www.eio.com/p-17417-velleman-ma40a5s-ultrasonic-transducer-transmittersender.aspx

 

Truth, I don't know. When I'm working with bonders, which use much higher freq U/S, I can tell if they are there by gently rubbing my finger nail on metal. When U/S are present it is as if there is a lubricant, the friction just goes away.

I have heard that hiss when using a U/S cleaner. Still don't know what causes it though.

No dog or cat handy?

 

I have a dog... but I can hear the sound no matter how i adjust it, so...
Do you think it's even the speaker? Or should I try making it a higher frequency and using that ultra sonic transducer?

 

Looking at the transducer it lists 40Khz as the nominal frequency.

Looking at AG's freq graph is only how loud the sound it, the lowest dip is 70db, the highest 120db. A wide range, but even the lowest level is still very loud.

How warm is the 555 getting? (touch it with your fingertip)

 

A thought just occured. If you have a half decent stereo you could try that, it is what we did when I was a kid. It worked.

 

the 555 isn't warm at all...
You mean like the speaker from a stereo? Would computer speakers work? I have several of those.
What do you suggest I do?

 

Connect it to the input of the stereo, let the stereo process it. It will be on the roll off, but it will likely process the sound on through. It was something I did when I was a teen.

 

I'm not sure how to do that, or if I even have a stereo around here...

So should I shy away from buying a different speaker? Or should I go ahead and purchase one of the 75watt tweeters and see how it works?

 

Part of why we are asking for piezo speakers is they have a high impedance. If you get other (say 4Ω) I can show you how to make a quick and dirty amplifier as part of the circuit do drive these speakers. They will be much louder though, but a puny 9V battery might be overwhelmed.

I really expect the stereo to work for testing purposes. It will work extremely well, do you have a stereo for entertainment?

I would not spend any high dollars.

 

Another thing, as a rough and ready test, put a second 33KΩ resistor in parallel with the 1st. This is only temporary, but it will drop the tone down about half, and you will be able to hear it loud and clear. When you remove the second resistor the tone will still be there, just as U/S.

 

Don't feed high frequencies to a stereo. The tweeters are very fragile and will blow up with a continuous high frequency tone.

The video sounds like something is very intermittent like loose contacts on a breadboard or a dying battery dropping its voltage when it tries to power the 555.

 

It may be the stereos now are different than the ones in 1978, but I knew of more than one person that ran them in excess of 12 hours. The techie nerds were mean in my part of the country.

 

It's not that I just cant hear the frequency, because I can hear it no matter how I adjust the dial...

How would I be able to tell if there's a loos contact?