PIEZOELECTRIC TRANSDUCER DRIVER CIRCUIT WITH ADJUSTABLE OUTPUT LEVEL
Original Publication Date: 1992-Dec-01
Included in the Prior Art Database: 2002-Jan-25
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.