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Cardiac sound amplifying circuit based on MAX 4465 amplifier chip and LM 386 amplifier chip

A technology of amplifying circuit and pre-amplifying circuit, applied in power amplifier, stethoscope and other directions, can solve the problem of rarely monitoring heart sounds and so on

Active Publication Date: 2012-09-26
HENAN HUANAN MEDICAL SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main monitoring parameters of portable multi-parameter monitors on the market are ECG, blood pressure, blood oxygen, respiration, body temperature, pulse rate and other parameters. There are few multi-parameter monitors that monitor heart sounds.

Method used

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  • Cardiac sound amplifying circuit based on MAX 4465 amplifier chip and LM 386 amplifier chip
  • Cardiac sound amplifying circuit based on MAX 4465 amplifier chip and LM 386 amplifier chip
  • Cardiac sound amplifying circuit based on MAX 4465 amplifier chip and LM 386 amplifier chip

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Embodiment Construction

[0016] The present invention will be further described below in conjunction with accompanying drawing and embodiment:

[0017] Such as figure 1 As shown, the present invention is mainly composed of a preamplifier filter circuit 1 and a postamplifier filter circuit 2. "IN" in the figure is the input of the heart sound signal source, and "OUT" is the final output signal.

[0018] The pre-amplifier circuit 1 includes resistors R1, R2, R3, R4, R8, R9, non-polar capacitors C1, C3, C7, C10, C11, and an amplifier chip MAX4465. One pin of the chip MAX4465 is connected to resistors R3, R4 and One end of capacitors C3 and C7, pin 2 is grounded, pin 3 is connected to one end of resistors R8, R9 and C10, pin 4 is connected to the other end of resistor R8, C10 and post-stage amplifier filter circuit 2, pin 5 is connected to 5V power supply . The other end of the resistor R9 is connected to the capacitor C11, and the other end of the C11 is grounded. The other end of resistor R3 is conn...

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Abstract

The invention discloses a cardiac sound amplifying circuit based on an MAX 4465 amplifier chip and an LM 386 amplifier chip, comprising a prime amplifying circuit and a post amplifying and filtering circuit. An acquiring and amplifying circuit consists of the MAX 4465 amplifier chip and the LM 386 amplifier chip, with a direct-current power supply of 5V for providing voltage to the whole circuit.The cardiac sound amplifying circuit completes acquisition and amplification of a cardiac sound signal by necessary filtering, can be flexibly transplanted to various application circuits with a highdegree of modularization, realizes a monitoring function to the cardiac sound and can meet the design requirements on the traditional portable medical products.

Description

technical field [0001] The invention relates to an amplifying circuit, which is mainly used in the field of medical equipment, and is used in a monitoring and diagnosing system of various physiological sign parameters of a human body, in particular to a heart sound amplifying circuit based on MAX4465 and LM386. Background technique [0002] With the rapid development of the medical electronics industry, portable medical devices are getting more and more attention and favor from people in the industry. The so-called portable equipment refers to electronic equipment products for treatment or testing that are small in size, light in weight, low in power consumption, and moderate in price. Portable medical electronic equipment is mainly divided into household portable medical electronic equipment and medical portable medical electronic equipment. The former includes electronic blood pressure monitors, electronic blood glucose meters, electronic hearing aids, etc.; the latter inc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F3/20A61B7/04
Inventor 夏振宏袁赞曾艳芳
Owner HENAN HUANAN MEDICAL SCI & TECH
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