Artifact to visit HiVi hivi T200C circuit detailed

HiVi Hivi's new music appreciation artifact-class speaker T200C is about to be launched. As a comprehensive recast of the classic T200B, what is the difference between the T200C and the power amplifier circuit design? The following will bring you the comprehensive circuit analysis of the Swans T200C.

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Unlike the T200B, the new T200C uses professional active electronic filtering technology to make the power more abundant, and the power amplifier has improved the control of the speaker. In addition, the T200C uses a dual-amplifier preamplifier and a single-amplifier post-stage design, in the main box of the T200C. The XLR fully balanced stereo linear input interface is loaded, the signal processing pre-stage circuit, the wireless Bluetooth adapter chip and the rear-stage power amplifying circuit part of the main box itself. The sub-channel rear-stage amplifying part is installed in the sub-box, the main sub-speaker It is connected by a 5-core multi-function cable to transmit audio signals and control signals. The main and sub-boxes are different in function, but the cabinet structure is exactly the same, with the same volume and strength to ensure the high consistency of sound quality.

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The following picture shows the T200C dual-channel pre-processing circuit. A total of 14 TL082 dual-channel op amps are used to form a 28-channel operational array responsible for the pre-level audio processing of the T200C, including electronic filtering, frequency fine-tuning and electroacoustic optimization. The T200C remains Using Crystal's CS3310 digital volume preamp, its dynamic range is 116dB, THD+N<0.001%, gain control range is -95.5dB to +31.5dB, and the step size is 0.5dB. The chip is known by many worlds Hi-End. The manufacturer sells tens of thousands of pieces of the best power amplifier for volume control. The T200C is also equipped with the LM13700 transconductance op amp, which is used in the overload protection circuit to ensure that the T200C does not work under extreme dynamics and effectively protects the power amplifier circuit and speaker.

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The rear-end circuit of the T200C main box is slightly different from the sub-box. It is equipped with a Bluetooth adapter chip, which allows users to more easily match various portable devices. The additional five TL082 op amps are used to input the pre-input signals of the T200C. Matching optimization, the post-stage power supply filter consists of four capacitors with a withstand voltage of 50V and 1000uF to form a total filter capacity of 4000uF. The advantage of using a parallel filter capacitor array instead of a large-capacity filter capacitor is to speed up the charge and discharge speed of the power supply part and improve the low-frequency control of the system. Force and level. The output power of each channel of the T200C is 70W RMS. The final amplification of the audio signal is carried out by two LM3886 chips produced by National Semiconductor Corporation, which are used to drive the tweeter and woofer respectively, and drive simultaneously with the same power amplifier chip. The high/woofer unit ensures the consistency of the amplifier's sound. The LM3886 amplifying IC achieves an average of 68W of continuous undistorted power output at rated operating voltage, and has excellent overvoltage, overcurrent and overheat protection functions, and has excellent driving force. And excellent tone expression.

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On the back of the T200C main box rear stage circuit, there is an XLR fully balanced stereo linear input interface and a 5-core sub-box connection.

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Relative to the main box, the rear stage of the sub-box is relatively simple. This is a set of pure post-stage power amplifier circuits, the same power reserve, the same power supply filter design and dual LM3886 rear-stage drive, and the main box rear stage is completely consistent, guaranteeing The consistency of the final tone.

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Huiwei's new T200C is a music appreciation speaker specially designed for young music enthusiasts. Its tone tends to be more neutral and feminine. It balances the resolution and smoothness of music. It can be used as a high-quality PC music player and Bluetooth. Become a convenient internet/smartphone music/entertainment system.