M-10-P Underwater Speaker

Lubell M-10-P Miniature U/W Transducer

GENERAL

The M-10-P transducer is designed for industrial applications including underwater communications operating in the speech frequency range. The transducer can be used as either an output transducer, converting an electrical input to vibratory force or sound pressure, or as an input transducer, converting sound pressure or vibratory force to electrical energy. When used as an output transducer, the device can function as an underwater speaker or bone vibrator. In the bone vibrator mode, the unit is placed against the users head (mastoid or cheek bone area), and audio information is transferred directly to the inner ear without the need for a conducting medium. Conversely as an input transducer, the unit functions as a hydrophone picking up air-borne or vibratory energy.

DESCRIPTION

The M-10-P is an electro magnetic device operating on the mass reaction principle. Very small air gaps provide high efficiency and are held accurately in position with a four-leg leaf spring. A highly permeable nickel alloy armature and an Alnico magnet are also a part of the rugged system. The M-10-P has a 10' shielded RG 174/U cable epoxy sealed into the case to prevent water entry. All case seams are epoxy sealed and the device and cable entry area are potted in vacuum degassed mil-spec hydrolytic stable urethane.

MECHANICAL

Weight: 20 grams - 0.64 oz (less cable)
Cable: 10' RG 174/U shielded (0.254 cm - 0.1" diameter)
Connector: Unterminated
Dims (LWH): 3.0cm x 1.88cm x 1.55cm - 1.18" x 0.74" x 0.61"

ELECTRICAL

Impedance: 10 ohms @ 1kHz
D.C. Resistance: 3 ohms

PERFORMANCE CURVE

Test conditions - Unit mounted on a Bruel & Kjaer 4930 artificial mastoid. The static load is 5.4 Newton. Unit driven from low impedance source with test level 0.1 Vrms (1.0mW). The input level remained constant as the frequency varied. An input level 20dB in excess of the test level (1.0 Vrms 100mW max) can be employed with no measurable effect on the device, however levels significantly higher may cause distortion and heating depending on the type of signal and its duration.

Price: $164

Lubell Labs Inc.
21 N. Stanwood Rd.
Columbus, Ohio 43209
(614) 235-6740 tel