I'm trying to find out the impedance of a piezo, it isn't logged in the datasheet and I'd like to know.
The circuit i'm using is an amp feeding a series resistor and inductor that go into the piezo, see pic.
From the amp I input a 12Vpp square wave, across the 1 ohm resistor is 4.5V, so it appears I'm inputting 12Vpp and 4.5A.
The inductor and piezo capacitance are matched to work at resonance, it is a dynamic piezo and rings like it should.
Across the piezo I have a 40Vpp sine wave.
My questions...I think there is enough info here to calculate a) the current draw of the piezo and b) the impedance of the piezo.
I will do any other tests if more information is needed.
Cheers.
The circuit i'm using is an amp feeding a series resistor and inductor that go into the piezo, see pic.
From the amp I input a 12Vpp square wave, across the 1 ohm resistor is 4.5V, so it appears I'm inputting 12Vpp and 4.5A.
The inductor and piezo capacitance are matched to work at resonance, it is a dynamic piezo and rings like it should.
Across the piezo I have a 40Vpp sine wave.
My questions...I think there is enough info here to calculate a) the current draw of the piezo and b) the impedance of the piezo.
I will do any other tests if more information is needed.
Cheers.