A piezoelectric ceramic discriminating circuit

Abstract

The invention discloses a piezoelectric ceramic discriminating circuit, including crystal triodes VT1, VT2, resistors R1, R2, ceramic capacitor C and reset switch SB, wherein the collector of the triode VT1 is connected to one end of the ceramic capacitor in one way, and is connected to the base of the triode VT2 in another way, the emitter of VT1 is connected to the negative electrode of the power supply in one way, and is connected to the collector of the triode VT2 in another way via R2, the base of VT1 is connected to the positive electrode of the power supply in one way via the resistor R1 and the reset switch SB, and is connected to one end of the ceramic capacitor C in another way, the base of the triode VT2 is connected to the collector of VT1 and the other end of the ceramic capacitor C respectively, and the emitter of VT2 is connected to the resistor R1 and the reset switch SB respectively. The invention can accurately judge the quality of the piezoelectric ceramic and the level of the electroacoustic conversion efficiency, so that the maintenance personnel can reduce the time of judging the fault.

Description

Technical Field

[0001] The invention relates to a discrimination circuit, in particular to a circuit for discriminating whether a piezoelectric ceramic sheet has a fault and judging the level of electroacoustic conversion efficiency. Background Art

[0002] Piezoelectric ceramics are the most commonly used electroacoustic components capable of reverse transduction by electronics enthusiasts. They can be used as generators, sound pickups, force sensors, etc. However, when testing such devices in batches, it is sometimes cumbersome to use conventional multimeter testing methods. By identifying the piezoelectric ceramic circuit, it is possible to quickly determine whether the piezoelectric ceramic is faulty and determine the electroacoustic conversion efficiency. Summary of the invention

[0003] The object of the present invention is to provide a piezoelectric ceramic discriminating circuit to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A piezoelectric ceramic discriminating circuit comprises a crystal triode VT1, VT2, resistors R1, R2, a ceramic capacitor C and a reset switch SB, wherein the collector of the triode VT1 is connected to one end of the ceramic capacitor in one way and to the base of the triode VT2 in another way, the emitter of VT1 is connected to the negative electrode of a power supply in one way and to the collector of the triode VT2 via R2 in another way, the base of VT1 is connected to the positive electrode of the power supply in one way via the resistor R1 and the reset switch SB and to one end of the ceramic capacitor C in another way, the base of the triode VT2 is respectively connected to the collector of VT1 and the other end of the ceramic capacitor C, and the emitter of VT2 is respectively connected to the resistor R1 and the reset switch SB.

[0006] Compared with the prior art, the beneficial effects of the present invention are: the present invention can accurately and quickly determine whether the piezoelectric ceramic piece is faulty and determine the level of electroacoustic conversion efficiency, so that maintenance personnel can reduce the determination time. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 This is a circuit diagram for determining the circuit of a piezoelectric ceramic sheet. DETAILED DESCRIPTION

[0008] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0009] See also Figure 1In the embodiment of the present invention, the transistors VT1, VT2, resistors R1, R2, and a ceramic dielectric

[0010] Capacitor C and reset switch SB, the collector of the transistor VT1 is connected to one end of the ceramic capacitor in one way, and is connected to the base of the transistor VT2 in the other way, the emitter of VT1 is connected to the negative electrode of the power supply in one way, and is connected to the collector of the transistor VT2 via R2 in the other way, the base of VT1 is connected to the positive electrode of the power supply through resistor R1 and reset switch SB in one way, and is connected to one end of the ceramic capacitor C in the other way, the base of the transistor VT2 is respectively connected to the collector of VT1 and the other end of the ceramic capacitor C, and the emitter of VT2 is respectively connected to resistor R1 and reset switch SB.

[0011] The circuit embodiment of the present invention is used for the detection of piezoelectric ceramics. Transistors VT1 and VT2 form a two-stage direct-coupled low-frequency amplifier circuit, and the piezoelectric ceramic to be tested is connected between its input end (VT1 base) and output end (VT2 collector), so that the circuit forms a self-excited multivibrator. The piezoelectric ceramic to be tested is both a positive feedback capacitor element and a sound-generating device. When the reset switch SB is pressed, if a continuous sound is emitted and the sound is loud, it means that the electroacoustic conversion efficiency is high, otherwise, the efficiency is low and the performance is poor; if no sound is emitted, it means that it is damaged.

[0012] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0013] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A piezoelectric ceramic discriminating circuit, comprising transistors VT1, VT2, resistors R1, R2, a ceramic capacitor C and a reset switch SB, characterized in that: The collector of the transistor VT1 is connected to one end of the ceramic capacitor in one way and to the base of the transistor VT2 in another way. The emitter of VT1 is connected to the negative electrode of the power supply in one way and to the collector of the transistor VT2 via R2 in another way. The base of VT1 is connected to the positive electrode of the power supply via the resistor R1 and the reset switch SB in one way and to one end of the ceramic capacitor C in another way. The base of the transistor VT2 is respectively connected to the collector of VT1 and the other end of the ceramic capacitor C, and the emitter of VT2 is respectively connected to the resistor R1 and the reset switch SB. The piezoelectric ceramic piece to be tested is connected between the base of the transistor VT1 and the collector of the transistor VT2.

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