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Buzzer input

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Peabody:
Looking for buzzers, I found this:

" Murata Electronics North America PK series has DC, peak-peak Signal, and zero-peak Signal input types."

With respect to internally-driven indicator buzzers, could someone explain what those input types mean?

Thanks

KMoffett:
Did you read their data sheets? "DC" means the the buzzers have internal oscillator circuitry to drive the piezo elements. You just supply a constant DC voltage. "peak-peak Signal" means you must supply an AC voltage at the piezo's frequency.  "zero-peak Signal" means you must supply a pulsating DC voltage at the piezo's frequency.

Ken

Peabody:

--- Quote from: KMoffett on December 08, 2018, 01:35:10 pm ---Did you read their data sheets? "DC" means the the buzzers have internal oscillator circuitry to drive the piezo elements. You just supply a constant DC voltage. "peak-peak Signal" means you must supply an AC voltage at the piezo's frequency.  "zero-peak Signal" means you must supply a pulsating DC voltage at the piezo's frequency.

Ken

--- End quote ---

That's what I would have thought.  But on Digikey I see a number of buzzers which are both "internally driven" and "zero-peak signal".  This one, for example:

https://www.digikey.com/product-detail/en/soberton-inc/WST-1206BX/433-1081-ND/1632599

That seems to be conflicting, but there are a numler of buzzers like that.  Of course that's just what Digikey says.  The datasheet doesn't actually say anything about how it's driven.

So that's why I asked.

KMoffett:
The PK series you linked to are "piezo" element buzzers.  The WST series are "electromechanical".

Ken

Peabody:
I'm not sure what difference that makes, but I finally found that WST buzzer that I knew I had somewhere in the junque box, and on testing it, it behaves like DC drive.  I apply 3.3V power to it, and it buzzes.  No wave form needed.  So I'm still puzzled by Digikey's description of it as zero-peak when other internally driven buzzers that behave the same way say "DC".  But looking further, it's only the Soberton buzzers that are described this funny way.  For all other manufacturers, if it's internally driven, it's also DC.  So I think it's just an error.  Mouser and Arrow don't carry that brand, so I can't compare there.

But you agree?  If it's internally driven, it's DC drive?


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