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HOW TO DRIVE A PIEZODEVICE

Former Member

I used to be knowledgable in these things but I have had some health problems (stroke and heart attack)  which have left me with some  blank spots in my memory.

 

So I would appreciate some help on some things.

 

I want to drive a piezo device at about 50 or 60 Hz.  This will create a ping or beep.

I want it to pulse for a predetermined time each time I press a button.

Do I need current limiting resistors or driver transistor?

 

Is there any one who can help me with this?

 

bob

Parents
  • 0

    Ok let me try to straighten some things out here.

    First it should be vegetable oil and not mineral oil.

    by putting the piezo device in the oil and in a plastic bottle it is  water proofed.  When you put a say 60 Hz tone on the piezo the sound waves travel through the oil into the water and you have low cost trans ducer to send out a signal for your home made low cost SONAR unit.

     

    That is the thoughts anyway. now to test the thoughts out.

Reply
  • 0

    Ok let me try to straighten some things out here.

    First it should be vegetable oil and not mineral oil.

    by putting the piezo device in the oil and in a plastic bottle it is  water proofed.  When you put a say 60 Hz tone on the piezo the sound waves travel through the oil into the water and you have low cost trans ducer to send out a signal for your home made low cost SONAR unit.

     

    That is the thoughts anyway. now to test the thoughts out.

Children
  • 0 in reply to Former Member

    The pattern of the sonar “wave” won’t necessarily be so different in water from that in air per sé, but the speed of the wavefront will be much faster in the much denser water. The main problem I imagine you would have using a transducer underwater that was designed for service in air, and vice-versa, is the frequency of operation. Most “sonar” transducers designed for use in air are ultrasonic, and the signal they produce will lose most of its useful energy within a very short distance underwater. Underwater sonar operates at a much lower frequency, and will not be effective at distance in an air medium.

    http://societyofrobots.com/robotforum/index.php?topic=158.0