Underwater Acoustic Transducer Driving — Matching Power and Output Impedance

Underwater acoustic transducers occupy the same functional role in sonar systems that antennas hold in radio equipment — they convert electrical signals into acoustic energy transmitted through water, or acoustic signals back into electrical form. Driving them efficiently requires both high voltage and substantial power, which is exactly what Aigtek's ATA-L series is built to deliver.

Why Underwater Acoustic Driving Is a Distinct Amplifier Category

Water is a far denser medium than air, and underwater transducers are correspondingly demanding loads — efficient acoustic coupling requires driving voltage and power well beyond what most general-purpose amplifiers provide. The ATA-L series addresses this directly, reaching up to 1200Vrms and 6500VA output power, with output impedance matched via multiple taps that can be adjusted to the specific transducer being driven.

The ATA-L Model Range

All nine models share the same voltage and impedance-matching philosophy; the choice between them comes down almost entirely to the total acoustic power your transducer array requires. Built-in output current and voltage monitoring (100mV/A and 10mV/V respectively) via BNC connectors lets the actual drive conditions be verified on an oscilloscope in real time, rather than inferred from the amplifier's front-panel settings alone.

Matching Output Impedance to the Transducer

Because underwater transducers vary significantly in impedance depending on design and operating depth, the ATA-L series' multiple-tap output impedance matching is not a convenience feature — it's necessary for efficient power transfer. Confirm your transducer's actual impedance at the operating frequency before final model selection, since a mismatch here wastes available power rather than delivering it acoustically.

Finch Electronic Solutions — Melbourne, Australia
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