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PIEZOELECTRIC TRANSDUCER DRIVER CIRCUIT WITH ADJUSTABLE OUTPUT LEVEL

IP.com Disclosure Number: IPCOM000006724D
Original Publication Date: 1992-Dec-01
Included in the Prior Art Database: 2002-Jan-25

Publishing Venue

Motorola

Related People

Authors:
Gary Pace

Abstract

In some battery powered products using a piezo- electric transducer as an alerting device, it is desirable to be able to control the alert tone loudness. In addition, it is sometimes desirable to reduce the current drain drawn from the battery by the piezoelectric transducer driver circuit, particularly when the battery approaches an end- of-life condition and battery life must be prolonged. The piezoelectric transducer driver circuit shown in Figure 1 provides the capability to adjust the transducer sound pressure level (SPL) as well as control the current drawn from the battery.