How can I decrease the voltage drift coming from an array of 2 x High Tech HTI-90-U hydrophones (-154.5 dB re 1V/uPa), both powered by 9V batteries?

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Krzysztof Herman

Dear Lucille,

if You use digital signal acquisition You can consider some DSP methods (avraging, DC component removing, filtering, denoising etc. ). You can also other preamplifier with high input impedance and low drift.

Regards

Chris

Haru Matsumoto

I would recommend to use an LDO regulator to supply a constant voltage to get rid of both voltage drop and noise.