Tibbetts Industries, Inc.

James S Collins

Peter L Madaffari

A preamplifier for use with high impedance audio frequency transducers, having two capacitance coupled stages each including a field effect transistor connected in follower mode. The two stages provide an impedance converter. The first field effect transistor is of substantially smaller geometry than the second, providing a low noise, low input capacitance. The second stage further reduces output impedance while maintaining low power supply feedthrough. A capacitor connected in shunt between the stages is employed for frequency shaping.

Low noise amplifier for microphone

A housing and diaphragm assembly for use in an acoustic transducer comprises a performed face plate having a ring shaped ridge for mounting the diaphragm. The housing includes a tubular sleeve having one end received over the ridge and secured to the face plate. Additional elements comprising an electret transducer are mounted with the diaphragm on the ridge internally of the housing.

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Lincolnville, ME, United States of America

James S Collins