the hydrophone is an underwater listening device, microphone, or electroacoustic receiving tranducer, designed specially for continued use in salt or fresh water. it operated on water in much the same manner that an ordinary microphone operates in air. it convert audio sound waves in water into analog electrical signals, which which are then amplified by your audio amplifier to level where you can hear them. you can use this devices to listen to amplified sound, or you can tape record underwater sound of all types.
HYDROPHONE LISTENER
The hydrophone listening system is composed of two parts, a hydrophone or microphone pre-amplifier assembly and an electronic amplifier assembly linked together by coaxial cable.
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