alastair-2010
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Hi,
I want to connect a piezoelectric ultrasonic transducer to the differential inputs of an instrumentation amplifier. I think its easy enough but i'm getting confused when I think about it.
I think of the piezoelectric transducer as an independent voltage source, when it experiences a change in mechanical stress it produces a proportional voltage with respect to the other plate.
If the amplifier is powered from a power source with no reference to the transducer then how can it "see" the signal? I know it will amplify the voltage difference at the inputs but doesn't that have to be relative to the amplifiers power supply?
Will any of the differential circuits work? I think they all will but don't see how!
Alastair
I want to connect a piezoelectric ultrasonic transducer to the differential inputs of an instrumentation amplifier. I think its easy enough but i'm getting confused when I think about it.
I think of the piezoelectric transducer as an independent voltage source, when it experiences a change in mechanical stress it produces a proportional voltage with respect to the other plate.
If the amplifier is powered from a power source with no reference to the transducer then how can it "see" the signal? I know it will amplify the voltage difference at the inputs but doesn't that have to be relative to the amplifiers power supply?
Will any of the differential circuits work? I think they all will but don't see how!
Alastair