ultra sonic transducers

[pete g]

if i was going to hook up one transducer would there be any polarity concerns?

[Zero999]

It depends, but my crystal ball has gone a little cloudy.

[woofy]

Plastic transducer, no problem.
Metal transducer, depends:
Check the case to the pins with a multimeter. If none are connected,  no problem.
If one pin is connected, make sure it is grounded if the circuit allows or at least isolated.

[pete g]

hi, thanks for responses. how would you hook up two or more in parallel?

[Zero999]

hi, thanks for responses. how would you hook up two or more in parallel?

You don't.

[Gyro]

As soon as you start putting transducers side by side, you start introducing interference patterns - peaks and nulls. That is almost certainly what you don't want.

[pete g]

hi, thanks for your responses. i have a problem. nearby dog barking. i'am looking for you ee's out there for a dog bark repeller. it needs to transmit an ultra sonic signal 75 to 100 feet. dog bark repellers are legal in my state so there is no liability issues. if someone will design the circuit i can build it. please help.

[CatalinaWOW]

Before you put any effort into building this thing, do you have any evidence that ultra sonic sounds suppress dog barking?  I know that dogs bark in response to hearing other dogs bark, and to unusual noises.  My knee jerk opinion would be that an ultrasonic noise would start dogs bothering rather than stop them.

[Zero999]

hi, thanks for your responses. i have a problem. nearby dog barking. i'am looking for you ee's out there for a dog bark repeller. it needs to transmit an ultra sonic signal 75 to 100 feet. dog bark repellers are legal in my state so there is no liability issues. if someone will design the circuit i can build it. please help.

You didn't say you wanted an ultrasound generator. Most people thought you wanted an ultrasonic microphone.

Please provide more information.

This is your last chance. More vague nonsense and you go on my ignore list.

[pete g]

sorry for my ineptitude. i need a ultrsonic transmitter (25khz) to project into my neighbors yard. approx. 75 to 100ft at a level the dogs can hear. ultra sonic conditioning of dog barking works. i suppose you would need an oscillator feeding into a high power ultra sonic amplifier and then a means of transmitting same. if i can provide more detail plz let me know.