LM4766 + NE5532 installed 2X40W amplifier, LM4766 Power Amplifier
Keywords: LM4766 + NE5532 installed 2x40W amplifier
LM4766 + NE5532 installed 2X40W amplifier
LM4766 is a two-channel high-fidelity utility in NS. There are two packages in which the LM4766T is not an insulated package. The average power output of 40W X 2 can be obtained under the rated voltage. The LM4766TF is an insulated package, which can be obtained under the rated voltage. The average power of 30WX2, its harmonic distortion is less than 0.06% under 8 Euro load, and each channel has independent smooth fade-in-calorizer to reduce the current impact when the switch is turned off, with a wide voltage range. 20V-78V (VEE + VCC), with 15-pin TO-22o package. Minimum peripheral components, and have a perfect protection (Spike Protection), which can be widely used in all kinds of high-fidelity audio devices.
The following is an appearance map of the LM4766 and a package size diagram.
Typical values for the electrical parameters of the circuit are as follows: Gain bandwidth product (GBWP): 8 MHz conversion rate (SLEW RATE): 9V / US Total harmonic distortion plus noise (THD + N): 0.06% Total quiescent current: 48mA common mode Suppression ratio (CMRR): 110dB open loop gain (AV): 115DB
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The following figure is a typical application circuit diagram of the integrated circuit.
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The following figure is a typical application circuit diagram of the integrated circuit (BTL mono)
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In the pre-magnification circuit, change the ratio of R3 / R2 to change the quadrature magnification, and netizens can reset the actual situation of the sound source. This site is set to 2 times to magnify, generally between 1-10 times, Change the size of R2 to achieve.
The post-level amplifier is also adopted by a comprehensive dynamic feedback circuit of a current voltage, and the advantages of combining two feedback. For details, please check the relevant web introduction of TDA7293 / LM3886
The power supply portion is powered by triplet. The front R18 / RE18 is a current limiting resistor, generally 10-30 Euro, (Note 100 Europe in the figure) C9 / CE9 is 6800 / 35V in the elements Tutang capacitance, power supply retirement small capacitance 0.1U is a fever CBB capacitor for WiMA
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The characteristics of the LM4766 are warm, similar to the inverse tone, and the LM1875 is similar, but in terms of power than the LM1875, individuals think it is an upgrade product of LM1875, which is also the current most popular integrated IC of many enthusiasts. I. Especially for friends who like LM1875, it is a nice choice. From the official online Datasheet of the US NS, the LM4766 and LM1876 peripheral circuits are the same, and the only different turnover mute control circuit is different. The same PCB board can also be created with the LM4766 and LM1876. The PCB board provided in this site is such a solution. There is only a few components in the PCB board, and there is a detailed description of the description in the above figure. Listening: The design of this board summarizes the previous works of the work of the play board design, strictly grounded on the wiring, the large current and small signals are kept away, and the ground isolation is used, and the large current line is widened, and the preserved pad processing is widened. When listening, the ear is not accessible in the background, and the sound noise is almost unable to smell the sound of thermal noise, indicating that the board has a good signal-to-noise ratio. The performance of playing music does not have to say, welcome netizens to make an evaluation, I think the board is a family audio, multimedia speaker upgrade and good choice, and a hot production of the audio DIYER in recent years. One of the integrated ICs, this The board of the station has joined the predecessor buffer large tone circuit in the forefront. It is more convenient to use, no need to add the front placed on the front, the requirements for the input signal line are reduced, as long as the power supply, signal input line, connect the speaker That is, a quite good HIFI level power amplified circuit
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