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Volume control circuit of piezoelectric buzzer

A piezoelectric buzzer and volume control technology, which is applied to transducer circuits, sensors, electrical components, etc., can solve the problems of using many components and complex circuit structures, and achieve less components, easy control, and low power consumption. low effect

Active Publication Date: 2014-01-08
FUJI XEROX SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The circuit structure is complex and many components are used

Method used

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  • Volume control circuit of piezoelectric buzzer
  • Volume control circuit of piezoelectric buzzer
  • Volume control circuit of piezoelectric buzzer

Examples

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Embodiment Construction

[0046] Below in conjunction with accompanying drawing and embodiment the present invention will be further described

[0047] An embodiment of the present invention (as attached figure 2 Shown) is a piezoelectric buzzer volume control circuit with two input ports. It consists of an input variable gain DC voltage control circuit, an input audio signal fixed gain amplifier circuit, and a piezoelectric buzzer resonance damping circuit connected by electrical signals.

[0048] The input variable gain DC voltage control circuit is composed of a first voltage divider and an operational amplifier U connected with electrical signals;

[0049] The input audio signal fixed-gain amplifying circuit is composed of a second voltage divider and an operational amplifier U connected by electrical signals.

[0050] in:

[0051] Op Amp Supply Voltage V CC = 5V;

[0052] Port B, D input signal maximum voltage amplitude V DD = 3.3V;

[0053] Port D can directly input a pulse width modulati...

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PUM

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Abstract

The invention provides a volume control circuit of a piezoelectric buzzer, in particular a volume control circuit which takes a rectangular wave as a working frequency waveform and controls the piezoelectric buzzer by direct-current voltage, and relates to the technical field of electronic circuits. The volume control circuit of the piezoelectric buzzer is provided with two input ports, wherein one of the input ports is used for inputting a rectangular wave frequency signal of which the frequency and the duty ratio can be changed according to requirements, and the other input port is used for inputting a direct-current voltage signal which is used for controlling an amplitude value of output voltage so as to achieve an effect of controlling the volume of the piezoelectric buzzer. The circuit consists of a direct-current voltage control circuit for inputting changeable gain, a fixed gain amplification circuit for inputting an audio signal, and a resonant damping circuit of the piezoelectric buzzer, which are connected through an electric signal, and comprises five resistors and an operation amplifier. The invention provides a volume control technical scheme of the piezoelectric buzzer, which is simple, low in cost, easily controlled by a micro processing chip directly.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, and specifically refers to a volume control circuit suitable for controlling a piezoelectric buzzer with a DC voltage and whose working frequency waveform is a rectangular wave. Background technique [0002] As far as the current technical means are concerned, the volume of the piezoelectric buzzer is usually controlled by the digital / analog (D / A) conversion channel of the microprocessor, or by a resistance attenuation network controlled by several registers. The register width The selection depends on the accuracy of the volume control of the piezoelectric buzzer. For example, a 4-bit register-resistor network can generate 16 output levels. The circuit structure is complex and many components are used. Contents of the invention [0003] The purpose of the present invention is to overcome certain deficiency or deficiency that the above-mentioned prior art exists, specifically refe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R3/00
Inventor 陈耀华
Owner FUJI XEROX SHANGHAI