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Piezoelectric Transducer Amplifier for TDK's PowerHap type 2.5G

Question asked by hjuksu on Jul 16, 2018
Latest reply on Jul 18, 2018 by Gauzz

I made a design for PowerHap 2.5G (capacitance 0.8uF) according the following guide: AN-106 APPLICATION NOTE (A Collection of Amp Applications) by Analog Devices. I utilized circuit shown in  Fig. 16 (attached). I had significant voltage drift in my output signal. Used OpAmp was TLC279. We want to use some modern OpAmp instead of OP-41. Can anyone help me by designing circuit for PowerHap piezo? Desired output bandwidth is about 0.1-10Hz and voltage leverl 0-3V.