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Re: Piezoelectric sensor preamplifier

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You need a "charge" amplifier.

This is nothing more but a VERY low input current opamp and instead of a feedback resistor you have a feedback capacitor in parallel with a 10M or higher resistor (or the thing will not be stable) to the inverted input. The capacitance should be the same as the piezo sensor.

Absolutely not OP07, the input current is far too high. You are interested in low current noise, not low voltage noise opamps.

Even so, I do not know what type of sensor you are using but it might be a hydrophone or an accelerometer. Some of these devices have a very low capacitance. If you connect this to a common voltage amplifier which has a significant input current you will severely limit your low frequency response.


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