Can't hear my piezospeaker!

jaybee11

I can't hear the output of my piezospeaker although everyone else in the room can. Is there another type of easily obtainable speaker that can be used? If yes, does it connect the same way as the piezo? Does it respond to the FREQOUT command? Thanks.

Moskog

Look· at page·200 in the BASIC Stamp Syntax and Reference Manual (or around·204 in the pdf-file you can·get from Parallax·downloads). On that page you will learn how to hook up an·amplifier or a speaker to your BS2 and then use it with FREQOUT.



Hope that helps!

Post Edited (Moskog) : 9/17/2009 3:29:04 PM GMT

RoboticsProfessor

Sounds like a hearing exam with an audio expert might be next if everybody else hears it.

Also, try differenty frequencies. If you have a partial hearing loss, usually you lose the upper freqs first.
Try a sequence like:
400
800
1200
1600
...etc. up to about
3600

to see which you can hear best.

Also, somewhere on this site is an audio amplifier chip hooked up to a small speaker. My students are making that now and it should be much louder.

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Richard Vannoy

Programming and Electronics Instructor
www.RichardVannoy.info
·

erco

Which Stamp are you using? If you are using a Project or Homework board, they have built-in resistors that limit current output and speaker volume.

Piezos are loudest at their own resonant frequency, usually in the higher frequencies . As Richard suggested above, I would suggest looping incrementally through a frequency sweep, but at a finer increment, like 100 hz at a time. You will probably find a small frequency range that sounds loudest to you.

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
·"If you build it, they will come."