Contact type sound production function circuit

Abstract

This utility model discloses a contact-based sound-generating circuit, including a signal input tracking module and a signal filtering and power amplification module. The signal input tracking module includes an operational amplifier chip. The input terminal of the operational amplifier chip is connected to multiple independent input protection circuits. Each input protection circuit consists of a resistor and multiple diodes connected in series to form an independent branch, and each of these independent branches is connected to copper foil. The output terminal of the operational amplifier chip is connected to multiple amplification buffer circuits. This functional circuit utilizes the conductivity of the human body, combining the resistance and capacitance values ​​of the human body with the circuit. By having human organs such as fingers contact the copper foil of the circuit board, an oscillation circuit is formed. After being amplified by the operational amplifier chip, the signal is filtered by a filtering circuit, and finally, the power amplification chip drives a speaker to produce sound. This makes the human body part of the sound-producing instrument, enhancing the product's fun factor.

Description

Technical Field

[0001] This utility model relates to the field of electronic circuit technology, specifically to a contact-type sound-generating circuit. Background Technology

[0002] Toys are a popular product category, encompassing a vast array of varieties. Sound-producing toys, which integrate visual, auditory, and tactile elements, are particularly appealing to children due to their multi-sensory nature. However, existing sound-producing toys typically rely on physical buttons for their interactive sound-producing mechanism, which somewhat diminishes their fun factor and fails to capture children's attention. Utility Model Content

[0003] This invention utilizes the conductivity of the human body, which has the characteristics of resistance and capacitance, to design a contact-type sound-generating circuit with adjustable volume, tone, and vibration frequency.

[0004] The technical solution adopted by this utility model is as follows: a contact-type sound-generating circuit, including a signal input tracking module and a signal filtering and power amplification module; the signal input tracking module includes an operational amplifier chip, the input terminal of which is connected to multiple independent input protection circuits, each input protection circuit consisting of a resistor and multiple diodes connected in series to form an independent branch, and each of the multiple independent branches being connected to copper foil; the output terminal of the operational amplifier chip is connected to multiple amplification buffer circuits; the signal filtering and power amplification module includes a power amplifier chip, the input terminal of which is connected to a power supply module, a signal conditioning and logic control module, and the output terminal of which is connected to a speaker amplifier module.

[0005] As a further improvement of this utility model, the operational amplifier chip is an SN74LVC574APWR chip, and the power amplifier chip is an LM4890S chip.

[0006] As a further improvement of this utility model, the amplification buffer circuit includes several groups of parallel MOSFET arrays, and the MOSFET arrays output stable signals through a MOSDFET driver stage, an RF switch control module and an inverting amplifier.

[0007] As a further improvement of this utility model, the signal conditioning and logic control module includes multi-stage amplification and filtering circuits to filter the signal output from the amplification buffer circuit and control the switch through logic gate circuits. The RC oscillation circuit controls the frequency of the speaker input signal and outputs to the power amplifier chip connected to the speaker.

[0008] As a further improvement of this utility model, the output terminal of the power amplifier chip is also connected to a headphone jack module.

[0009] The beneficial effects of this invention are as follows: This functional circuit utilizes the conductivity of the human body, combining the resistance and capacitance values ​​of the human body with the circuit. Through contact between human organs such as fingers and the copper foil of the circuit board, an oscillation generation circuit is formed. After being amplified by an operational amplifier chip, the sound is filtered by a filter circuit, and finally driven by a power amplifier chip to produce sound. This makes the human body part of a sound-producing instrument, enhancing the product's appeal. Attached Figure Description

[0010] Figure 1 This is a circuit diagram of one embodiment of the present invention.

[0011] Figure 2 This is an input protection circuit diagram of one embodiment of the present invention.

[0012] Figure 3 This is a circuit diagram of an amplification buffer circuit according to an embodiment of the present invention.

[0013] Figure 4 This is a circuit diagram of a signal filtering and power amplification module according to an embodiment of the present invention.

[0014] Figure 5 This is a circuit diagram of an RC oscillator according to an embodiment of the present invention. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings.

[0016] Example 1: A contact-type sound-generating circuit includes a signal input tracking module and a signal filtering and power amplification module. The signal input tracking module includes an operational amplifier chip. The input terminal of the operational amplifier chip is connected to multiple independent input protection circuits. Each input protection circuit consists of a resistor and multiple diodes connected in series to form an independent branch. Each of the multiple independent branches is connected to copper foil. The output terminal of the operational amplifier chip is connected to multiple amplification buffer circuits. The signal filtering and power amplification module includes a power amplifier chip. The input terminal of the power amplifier chip is connected to a power supply module, a signal conditioning and logic control module, and the output terminal of the power amplifier chip is connected to a speaker amplifier module.

[0017] The operational amplifier chip used is the SN74LVC574APWR chip, and the power amplifier chip used is the LM4890S chip.

[0018] Example 2: To further achieve stable tracking and amplification of the input signal and ensure timely tracking of the input signal, the amplification buffer circuit includes several parallel MOSFET arrays. The MOSFET arrays output stable signals through a MOSDFET driver stage, an RF switch control module, and an inverting amplifier.

[0019] Example 3, to further enhance signal conditioning and logic control, includes a multi-stage amplification and filtering circuit to filter the signal output from the amplification buffer circuit and control the switch via logic gates. The signal is converted into a standard voltage signal through voltage division, filtering, and amplification (operational amplifier), and then controlled by logic gates to form a typical "weak current controlling strong current" architecture. Analog circuits (operational amplifiers, sensors) and digital logic (MC14069, MOSFET drivers) coexist, with interference isolated through grounding and decoupling designs. An N / P channel MOSFET combination is used to support bidirectional or unidirectional power output, adapting to different loads.

[0020] In Example 4, the output of the power amplifier chip is also connected to a headphone jack module to achieve diversified audio output.

[0021] The power supply and power modules of this circuit are traditionally powered by batteries and USB power, which will not be described in detail here.

[0022] Users provide contact capacitance to the circuit by touching the copper foil on the circuit board. The operational amplifier chip tracks and amplifies the input voltage signal. After the amplified signal is filtered by the filter circuit, the power amplifier chip drives the speaker to produce sound.

[0023] Those skilled in the art should know that the protection scheme of this utility model is not limited to the above embodiments, and various arrangements, combinations and transformations can be made on the basis of the above embodiments. Without violating the spirit of this utility model, all transformations made to this utility model fall within the protection scope of this utility model.

Claims

1. A contact-type sound-generating circuit, characterized in that: Includes a signal input tracking module and a signal filtering and power amplification module; The signal input tracking module includes an operational amplifier chip. The input terminal of the operational amplifier chip is connected to multiple independent input protection circuits. Each input protection circuit consists of a resistor and multiple diodes connected in series to form an independent branch. Each of the multiple independent branches is connected to a copper foil. The output terminal of the operational amplifier chip is connected to multiple amplification buffer circuits. The signal filtering and power amplification module includes a power amplification chip. The input terminal of the power amplification chip is connected to a power supply module and a signal conditioning and logic control module, and the output terminal of the power amplification chip is connected to a speaker amplifier module.

2. The contact-type sound-generating circuit according to claim 1, characterized in that: The operational amplifier chip is the SN74LVC574APWR chip, and the power amplifier chip is the LM4890S chip.

3. The contact-type sound-generating circuit according to claim 1, characterized in that: The amplification buffer circuit includes several parallel MOSFET arrays, which output stable signals through a MOSDFET driver stage, an RF switch control module, and an inverting amplifier.

4. The contact-type sound-generating circuit according to claim 1, characterized in that: The signal conditioning and logic control module includes multi-stage amplification and filtering circuits to filter the signal output from the amplification buffer circuit and control the switch through logic gate circuits; the filtering circuit is an RC oscillation circuit to control the oscillation frequency.

5. A contact-type sound-generating circuit according to claim 1, characterized in that: The output of the power amplifier chip is also connected to a headphone jack module.

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