Control circuits for piezo electric transducers

Details Control circuits for piezo electric transducers Control circuits for piezo electric transducers

1975-05-28

1976-11-02

Budd, Mark O.

Electrical generator or motor structure

Educational or construction units or kits

318116, H01L 4104

Patent

active

039899632

ABSTRACT:
A control circuit for cyclically operating one or more piezoelectric transducers to transmit and receive ultrasonic signals is disclosed. The circuit comprises a power transistor in series with an induction coil and controlled by a timing circuit to conduct for a short time during each cycle. As the power transistor cuts off a high voltage pulse is generated by the induction coil and this is fed via a zener diode as the transmission signal to the or each piezoelectric transducer across which is connected a switching circuit comprising a potential divider and a pair of opposite polarity diodes which automatically feed off the high voltage transmission signal to earth and pass low strength received signals to an amplifier.

REFERENCES:
patent: 3638087 (1972-01-01), Ratcliff
patent: 3701903 (1972-10-01), Merhar
patent: 3740582 (1973-06-01), McCusker et al.
patent: 3801893 (1974-04-01), Joyce
patent: 3911298 (1975-10-01), Borsdorf

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