Can anyone tell me what this disc is. I need one.



Moderators note : cropped image

 

Piezo Buzzer?

 

Disc is a piezoelectric transducer.
If it has an active circuit driving it to oscillate then we call it a buzzer.

 

Disc is a piezoelectric transducer.
If it has an active circuit driving it to oscillate then we call it a buzzer.

It used for a sound activated device I’m trying to repair.

 

It used for a sound activated device I’m trying to repair.

If the device doesn't make sounds, then it could be using the component as a microphone which is just the reverse of using it to make sounds.

Why do you think it is defective? How have you tested it?

 

If it is a piezoelectric transducer as mrchips indicated (and I share his opinion) your application might not work well or at all unless you replace the transducer with one that resonates at the same frequency. It depends on the application and the way the transducer is driven. To summarize, success is most likely to be achieved if you can find an identical replacement part.

 

If it is a piezoelectric transducer as mrchips indicated (and I share his opinion) your application might not work well or at all unless you replace the transducer with one that resonates at the same frequency. It depends on the application and the way the transducer is driven. To summarize, success is most likely to be achieved if you can find an identical replacement part.

That’s my problem, finding an identical part. There is no markings on it and it no longer functions. The picture was for id only. I’m trying to repair a sound activated decoration of my wife’s. Thanks for your response.

 

Then it looks like the only thing you can do is get some and try them. Have you ever seen it used -if so, could you hear any sounds being emitted by it when activated?

 

Then it looks like the only thing you can do is get some and try them. Have you ever seen it used -if so, could you hear any sounds being emitted by it when activated?

It receives sound to activate motion, ie a clap or loud sound.

 

Tell us more clearly what the device does.
When the device detects sound, what is supposed to happen after that? Is there any sound output?

It seems unusual for such a device to use a piezoelectric transducer as a sound detector.
Is there a microphone anywhere on the device?

 

Tell us more clearly what the device does.
When the device detects sound, what is supposed to happen after that? Is there any sound output?

It seems unusual for such a device to use a piezoelectric transducer as a sound detector.
Is there a microphone anywhere on the device?

No microphone other than this disc. When it detects sound it starts moving.

 

No microphone other than this disc. When it detects sound it starts moving.
[/It receives sound to activate motion, ie a clap or loud sound

 

Impulse noise would be a use case for a piezo microphone. You might find that any raw piezo works, but many piezo buzzer contain active electronics which would not.

How do you know the fault is in the transducer?

 

Here is a probable replacement.

https://www.ebay.com/itm/20mm-Trans...Copper-Aluminum-Buzzer-With-line/223515500413

 

Impulse noise would be a use case for a piezo microphone. You might find that any raw piezo works, but many piezo buzzer contain active electronics which would not.

How do you know the fault is in the transducer?

It functions properly except sound will not activate it

 

It functions properly except sound will not activate it

Well, it might not be because the transducer is bad. You might want to find a way to test that.

 

Here is a probable replacement.

https://www.ebay.com/itm/20mm-Trans...Copper-Aluminum-Buzzer-With-line/223515500413

Thank you! Part ordered and I’ll give it a try when it comes in