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Speech preamplifier circuit used for teaching microphone

A preamplifier circuit, microphone technology, applied in transducer circuit, negative feedback circuit layout, electrical components and other directions, can solve the problems of unstable received signal, complex structure, inability to distinguish voice input signal, etc., to achieve stable received signal , the effect of simple structure

Inactive Publication Date: 2015-05-13
CHENGDU BOOSTOR TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional voice preamplifier circuits for microphones cannot distinguish voice input signals from noise input signals, and traditional voice preamplifier circuits still have problems of complex structure and unstable received signals

Method used

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  • Speech preamplifier circuit used for teaching microphone

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Embodiment Construction

[0009] The present invention will be further described below in conjunction with accompanying drawing:

[0010] Such as figure 1 As shown, the present invention is a voice preamplifier circuit for teaching microphones, including a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, Seventh resistor R7, eighth resistor R8, ninth resistor R9, first capacitor C1, second capacitor C2, third capacitor C3, fourth capacitor C4, fifth capacitor C5, sixth capacitor C6, integrated circuit IC, diode D, the signal input device Q of the microphone, the potentiometer RP and the switch tube W, the power supply voltage input terminal is respectively connected with the first terminal of the first resistor R1, the power supply terminal of the integrated circuit IC and the first terminal of the fifth resistor R5, the second The second end of a resistor R1 is respectively connected to the static capacitor end of the integr...

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Abstract

The invention discloses a speech preamplifier circuit used for a teaching microphone. The speech preamplifier circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, an integrated circuit, a diode, signal input equipment of the microphone, a potentiometer and a switch tube, wherein the supply voltage input end is connected to the first end of the first resistor, the power source end of the integrated circuit and the first end of the fifth resistor. According to the speech preamplifier circuit used for the teaching microphone, the speech preamplifier circuit is capable of distinguishing a speech input signal and a noise input signal through a level detector formed by the second capacitor and the third resistor. The speech preamplifier circuit has the advantages of simple structure and a stable receiving signal.

Description

technical field [0001] The invention relates to a preamplifier circuit, in particular to a voice preamplifier circuit for teaching microphones. Background technique [0002] Universities now use multimedia teaching, and the microphone is an indispensable part of multimedia teaching. The microphone contains a voice preamplifier circuit that filters noise and amplifies sound. The traditional voice preamplifier circuit used for microphones cannot distinguish the voice input signal from the noise input signal, and the traditional voice preamplifier circuit also has the problems of complex structure and unstable received signal. Contents of the invention [0003] The purpose of the present invention is to provide a voice preamplifier circuit for teaching microphones in order to solve the above problems. [0004] In order to achieve the above object, the present invention adopts the following technical solutions: [0005] A voice preamplifier circuit for a teaching microphone,...

Claims

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Application Information

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IPC IPC(8): H03F1/34H04R3/00
Inventor 朱珠张庆智
Owner CHENGDU BOOSTOR TECH
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