I have a 24mm piezo transducer with the marking SSE2425TAL from overseas. There are no detailed specs nor graphs to get LS, CS, RS, and CO at various frequencies (but just 25 kHz is fine).

I'd like to model this passive piezo transducer "reasonably" in Multisim, which means not just modeling a capacitor or a generic crystal or a generic RC circuit. The 'why' revolves around resonance, voltage spikes, current draw, undampened oscillation, and the like. For example, the 100V+ peaks should not happen if I can model the piezo transducers properly (please ignore this throwaway schematic otherwise).

failed sim

With an LC meter, I can measure the piezo capacitance, say, 2500pF, but I'm not sure if that is accurate due to the R and and mechanical L of the piezo.

Then, with an oscilloscope, multimeter, an LC meter, and a handful of basic components, how to determine the LS, CS, RS, and CO for this piezo and various unlabeled piezo transducers I found?



REF: https://www.biosono.com/PrmtLgd/PrmtLgd.php?id=TrnsRlc

  • \$\begingroup\$ Where's the link to the piezo's data sheet? \$\endgroup\$
    – Andy aka
    Commented Mar 8, 2022 at 18:40
  • \$\begingroup\$ No data sheet, I'm afraid. Also, I'd like an answer to be helpful for multiple piezos with no markings. \$\endgroup\$
    – Drakes
    Commented Mar 8, 2022 at 18:41
  • \$\begingroup\$ What to do when there is no data sheet----->>> What to check for when buying an electronic component or module. This is why engineers don't buy components that have inadequate specifications. I suggest you build some test fixture where you can measure the values you require. \$\endgroup\$
    – Andy aka
    Commented Mar 8, 2022 at 18:43
  • 1
    \$\begingroup\$ @Drakes Used to be that we'd get parts from major manufacturers (BJTs come immediately to mind) and where we could not afford the costs to design circuits that would mitigate variations between parts we'd get (BJTs cost US$100 in today's dollars, for example, and there were no ICs.) In these cases, we'd pay for or design instrumentation needed to test for the parameters we cared about and design accordingly. Today isn't yesterday. If this is a hobby desire, though, then your interest is valid -- how to characterize a device. But it may take a chapter or two to give a good answer. \$\endgroup\$
    – jonk
    Commented Mar 8, 2022 at 18:49
  • 1
    \$\begingroup\$ @Drakes You may want to either find manufacturers who document their testing procedures and schematics used to create their datasheets on such devices and/or initiate a conversation with same. If you are polite and clear, you may get some favorable responses, putting you in contact with appropriate engineers who can help you understand what you need to do in order to get what you want from a device you are holding. Worth a shot, I'd say. Then come back here and write an answer and tell us what you learned! :) \$\endgroup\$
    – jonk
    Commented Mar 8, 2022 at 18:54


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