Piezoelectric Sounders FAQQDoes a Piezoelectric Sounder (Eternal Drive Type) have polarity?

Following products have specified polarity in order to prevent deterioration of the piezoelectric properties of the product.
  • PKMCS1818E20*
  • PKM17EPP-20*
Concerning the other sounders except for the above, provided that you use the product within the range of the maximum input voltage specified for each product, there is no need to take account of the electrical polarity.

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