Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1997-08-01
1999-05-18
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
3403846, 310316, H01L41/08
Patent
active
059053267
ABSTRACT:
A control circuit for a piezoelectric buzzer, notably for automobiles, comprises a circuit for generating alternately two different frequencies and features two input supply terminals (1, 2) and two output terminals (4, 5) for buzzer activation. The control circuit includes a first flip-flop with a first and a second output, of which one carries positive and the other negative voltage. Also provided is a second flip-flop with a first input and an output, the first input connecting to the first and second outputs of the first flip-flop, each via a resistor (R4, R3). The second flip-flop consists of a parallel wiring of a first series connection of a capacitor (C2) and an inverter with Schmitt trigger input (IC1C), and a second series connection of a resistor (R5) and an inverter with Schmitt trigger input (IC1D), while a resistor is wired in parallel with the second series connection. Once a positive supply voltage is applied and grounding established, the buzzer sounds, generating alternately different frequencies f1 and f2.
REFERENCES:
patent: 4303908 (1981-12-01), Enemark et al.
patent: 4393373 (1983-07-01), Torii et al.
patent: 4653101 (1987-03-01), Myers
patent: 5181019 (1993-01-01), Gottlieb et al.
Budd Mark O.
Eaton Corporation
Johnston Roger A.
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