Device including battery-activated oscillator

Details Device including battery-activated oscillator Device including battery-activated oscillator

1987-03-20

1988-02-16

Tarcza, Thomas H.

Communications, electrical: acoustic wave systems and devices

Transmitter systems

Animal control

331111, 340384E, H04B 102, H03K 326

Patent

active

047259930

ABSTRACT:
A low duty cycle relaxation oscillator periodically gates an ultrasonic frequency relaxation oscillator into an on state. The ultrasonic frequency oscillations are supplied to an electric-compressional wave transducer by way of a push-pull driver. The duty cycle and repetition rate of the relaxation oscillator and the ultrasonic oscillation frequency are such that compressional waves derived by the transducer incident on fleas in the region where the transducer is located repels the fleas. All active elements in the oscillator and driver are CMOS devices which draw only leakage current while in quiescent bi-level states and through current from a battery during transitions between the bi-level states. The drain from the battery is reduced by connecting a high impedance between the battery and the CMOS devices during a relaxation oscillator transition.

REFERENCES:
patent: 4669424 (1987-06-01), Bianco et al.

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