CN2323514Y

CN2323514Y - Small high-fidelity power amplifier

Info

Publication number: CN2323514Y
Application number: CN 98202059
Authority: CN
Inventors: 杨霖
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-03-10
Filing date: 1998-03-10
Publication date: 1999-06-09
Anticipated expiration: 2008-03-10

Abstract

The utility model relates to a small high-fidelity power amplifier, which belongs to sound equipment. The utility model is composed of a casing and an electronic line which comprises a power supply rectifier filter circuit and a power amplification circuit. A panel of the casing is equipped with a power switch (1), a volume control button (2) and an audio input jack (3). The utility model has the advantages of low cost, high sound quality, no distortion, no noise, high power, vigorous energy, small size and easy portability and placement, and is the ideal small high-fidelity power amplifier which is suitable for use in any households.

Description

Small-sized high-fidelity power amplifier

The utility model relates to a kind of small-sized high-fidelity power amplifier, relates to a kind of distortionless mini power amplifier of family expenses sound equipment tonequality that is used to keep specifically, belongs to sound appliances.

At present, the power amplifier that the family expenses sound equipment is used has two kinds basically, and is a kind of than relatively large, about more than 300 * 300 * 100 millimeters, outward appearance seems very style to size greatly, and function is many, power output is very big, yet, its heaviness, volume is big, not portable, cost an arm and a leg, the more important thing is that tonequality fails to reach high-fidelity, that is: can not reach and keep height pure tone matter undistorted; Another kind is a built-in power amplifier in the multimedia loudspeaker box that generally uses on the multimedia computer, and it is practical and convenient, and function is also a lot, but its tonequality can not be satisfactory.The common drawback of above-mentioned two kinds of power amplifiers is: their tonequality all can not reach high-fidelity.Main cause be because of its function many, caused their tonequality can not fidelity, especially built-in power amplifier is more outstanding in multimedia loudspeaker box, exist two big electric current lines of power line and audio amplifier holding wire and signal or audio frequency input to wait other various little electric current lines in the slight audio amplifier simultaneously, these power lines are each self-forming electromagnetic field in audio amplifier, certainly will interfere with each other, especially audio input end is because its impedance is big, disturbed is also serious, the tonequality of input all can not fidelity, let alone the tonequality after amplifying.This in addition built-in power amplifier has also caused the tonequality difference of two audio amplifiers owing to be installed in a certain case of a pair of audio amplifier, does not coordinate, and has caused the solid space location of sound inaccurate, i.e. infidelity.Moreover existing most of power amplifier all adopts a power supply to supply preposition amplification and the two-part method of main power amplification, and this method diminishes tonequality most, and especially under max volume, sound can produce serious distortion phenomenon.

The purpose of this utility model just is to design the distortionless power amplifier of a kind of small-sized kept height pure tone matter, can not realize the deficiency of high-fidelity to overcome existing power amplifier.

The purpose of this utility model is achieved in that it mainly is made up of shell and electronic circuit, described electronic circuit comprises power supply rectification filter circuit and power amplification circuit, it is characterized in that AC power imports the B1 rectifier bridge after transformer T1 transformation, the positive pole of B1 output and the positive pole of electric capacity E1, the end of C1 and the end of L1 are connected, the negative pole of E1 and the positive pole of E2, the other end of C1, the end of C2, the positive pole of E4, the negative pole of E3, the end of C8, the other end of C7, the mid point of T1, the end of R2 is connected with ground, the negative pole of B1 output and the negative pole of E2, the end of the C2 other end and L2 is connected, the other end of L1 and the positive pole of E3, the end of C7 and 7 legs of IC1 are connected, the other end of L2 and the negative pole of E4,5 legs of the other end of C8 and IC1 are connected, 1 leg of IC1 is connected with the other end of C3, the end of R1 and ground, R5, R6,2 legs of IC1,3 legs, 8 legs and loud speaker S1, the other end of S2 connects, the middle-end of R1 is connected with the end of C3,9 legs of IC1 are connected with the end of C4, the other end of C4 is connected with the R2 mid point, the other end of R5 is connected with the end of C5,4 legs of the other end of C5 and IC1, the end of S1 connects, the other end of R6 is connected with the end of C6,6 legs of the other end of C6 and IC1, the end of S2 connects, R1, the other end of R2 is connected with audio input jack (3).

Its feature is that also housing face-plate is provided with mains switch (1), volume control knob (2) and audio input jack (3).

The utility model is compared with prior art: its cost is low, and tonequality is good, and is undistorted, noiselessness, and the power height, energy is abundant, and volume is little, and be easy to carry about with one and place, be a kind of desirable small-sized high-fidelity power amplifier applicable to any family expenses sound equipment.

Below in conjunction with drawings and Examples the utility model is further specified:

Accompanying drawing 1 is the utility model schematic appearance.

Accompanying drawing 2 is an electronic-circuit diagram of the present utility model.

Among the figure: 1, mains switch, 2, volume control knob, 3, audio input jack.

As we know from the figure, it mainly is made up of the utility model shell and electronic circuit, described electronic circuit comprises power supply rectification filter circuit and power amplification circuit, power supply rectification filter circuit comprises transformer T1, T1 is input as and exchanges 220 volts, T1 is output as and exchanges two 12-15 volts, filter capacitor E1, E2, E3 and E4 select for use 2200～22000 microfarads all can, C1, C2, C3, C4, C7 and C8 select the noninductive electric capacity of 0.1-0.33 microfarad for use, R1 and R2 select the duplex potentiometer of 100 kilo-ohms～1 megaohm for use, C5 and C6 select the noninductive electric capacity of 0.02 microfarad for use, R5 and R6 select the resistance in 4-8 Europe for use, IC1 selects the TDA1521 circuit for use, B1 selects the BRIDGE2 rectifier bridge for use, L1 and L2 are wire-wound filtering magnet ring, its perfectly straight stream, resistance exchanges, it why selects magnet ring to be because its magnetic circuit closure, noiseless to external world, and the inductance value increase is very big, leaches fairly obvious to the alternating component in the power supply, on the other hand, L1 and L2 wire-wound filtering magnet ring still are the element of energy reserve, and it has constituted the abundant power supply of energy together with big electrochemical capacitor, so this power amplifier can drive big audio amplifier.Its operation principle is: the input signal that comes from audio input jack (3) through the amplification of power amplifier integrate circuit TDA1521, outputs to loud speaker S1 and S2 by coupling capacitance C3 and C4 at last after volume control knob (2) is selected.

Claims

1, a kind of small-sized high-fidelity power amplifier, it mainly is made up of shell and electronic circuit, described electronic circuit comprises power supply rectification filter circuit and power amplification circuit, it is characterized in that AC power imports the B1 rectifier bridge after transformer T1 transformation, the positive pole of B1 output and the positive pole of electric capacity E1, the end of C1 and the end of L1 are connected, the negative pole of E1 and the positive pole of E2, the other end of C1, the end of C2, the positive pole of E4, the negative pole of E3, the end of C8, the other end of C7, the mid point of T1, the end of R2 is connected with ground, the negative pole of B1 output and the negative pole of E2, the end of the C2 other end and L2 is connected, the other end of L1 and the positive pole of E3, the end of C7 and 7 legs of IC1 are connected, the other end of L2 and the negative pole of E4,5 legs of the other end of C8 and IC1 are connected, 1 leg of IC1 is connected with the other end of C3, the end of R1 and ground, R5, R6,2 legs of IC1,3 legs, 8 legs and loud speaker S1, the other end of S2 connects, the middle-end of R1 is connected with the end of C3,9 legs of IC1 are connected with the end of C4, the other end of C4 is connected with the R2 mid point, the other end of R5 is connected with the end of C5,4 legs of the other end of C5 and IC1, the end of S1 connects, the other end of R6 is connected with the end of C6,6 legs of the other end of C6 and IC1, the end of S2 connects, R1, the other end of R2 is connected with audio input jack (3).

2, small-sized high-fidelity power amplifier according to claim 1, its feature are that also housing face-plate is provided with mains switch (1), volume control knob (2) and audio input jack (3).