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

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...

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