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购买连接:http://item.taobao.com/auction/i ... m_num_id=8489097977
部分调校开发过程:http://erji.net/read.php?tid=886171
U100 是一部高性能小体积USB音频解码器+耳机放大器，同时具有RCA线路输出和3.5mm线路输入，可以作为USB解码供其它功率放大器或音箱使用，可通过3.5mm线路输入当作纯耳放使用。U100专为使用电脑USB端口来听音乐的用户设计，拚弃光纤和同轴输入功能，更专注的做好USB接口解码的素质。单纯的USB高性能解码，能工作在更好的状态下。
U100体积小巧，（160*110*30mm）采用铝合金精工制造，造型精致，重量较轻，仅重0.4kg，机身圆弧设计，可方便的放入笔记本电脑包，随笔记本电脑一起携带。使用它联接电脑驱动耳机或音箱，就可以组成一套高素质的桌面PC HIFI系统。
U100使用了钰龙韵电子自主开发的高性能超低纹波音频专用开关电源供电，这使U100可以在较小的体积上做到有足够的驱动能力和优良性能，U100使用高性能的TE7220L(USB2.0/24Bit/96KHz)进行USB数椐接收，生成的I2S信号直接送到Cirrus logic的CS4398(动态达到120dB，失真加噪声低至-107dB )来完成DA转换，模拟电路部分使用ADI最新技术运放ADA4075-2以及松下高精度贴片CBB电容等组成的LPF电路。功率放大使用ADA4075-2+“钻石”晶体管缓冲电路进行放大输出。电路部分简洁高效，信号全部直通的模式，可以让信号通道做到非常短，避免了信号传输过程中的干扰和损失。
本机经过较长时间的调校，声音风格表现为：清澈透明，细腻柔和，全频均衡自然耐听，使用高频率电源供电更能保证耳机输出部分功率充足，噪声小，瞬态响应良好。
本机功能及操作：
接好电外置电源，开启本机面板电源开关，面板POWER灯亮起，用USB线连接电脑与U100，电脑能自动识别属性为yulongaudio的音频设备，并自动安装驱动软件。安装成功后，在电脑上播放音乐，接上耳机或音箱，即可在电脑上播放并且欣赏音乐。
注意1：U100接上电脑，默认为固定至最大音量，不可以在电脑上对音量进行调整，如果需要使用电脑调整音量，请下载可调音量固件更新U100(可调音量版本音量默认为中间值，此音量值U100不是最佳性能)。
(固件调整)：下载U100 VOL固件和U100 Brush firmware软件，使用U100 Brush firmware软件读取U100VOL固件然后发送至U100更新即可。(详见使用说明书
注意2：3.5mm线路输入在插头插入后自动断开USBDAC，转换成为线路输入耳机放大模式，如需使用USB DAC+耳机放大，请注意3.5mm 线路输入在空置状态。
本机特点:
● USB输入：USB2.0/24Bit/96KHz
● 线路输入(3.5mm)
● 线路输出(RCA)
● 耳机放大器输出(6.35)
● 电源输入：6-20VDC
● 内部高品质开关电源供电.
● Cirrus logic CS4398 -107dB THD+N
● 铝合金体积小巧外壳（160*110*30mm）
● 可通过USB更新固件
● 全球通用交流电源(90-250V无需转换)
本机技术指标：
● 输入频率：32-96KHz/16/24Bit自动识别
● 信噪比：>120dB
● 动态范围：110dB
● 失真度加噪声： <0.0009% @ 1KHz
● 额定输出：2V RMS
● 频率响应：20-20KHz-0.2dB
● 整机功率：<10W
● 耳机输出功率：100mw/300R
● 机器体积：160*110*30mm
● 净重：0.45Kg(实际运输重量以外包装结构为准)
标配：进口高品质镀金6.35转3.5转接头,3.5-RCA转接头,惠普USB线.定制高品质电源。
（实测图表请见最后页）
U100 is a high performance, compact size USB decoder and headphone amplifier. It features RCA line out as well as 3.5mm line in, so it can be used as USB decoder to connect other amplifier or speaker box, or to be used as a stand alone headphone amplifier by the 3.5mm line input. U100 is intended in only USB input and optimized it for ultimate performance, so there is no other digital input available.
The U100 has an elegant, compact housing (160*110*30mm) which is carefully made in aluminum alloy, and it weighs only 0.48kg. By simply connect it to a PC via USB, then to drive the headphones or speakers; it is so convenient to build a high-quality PC Hi-Fi system.
The power supply of the U100, developed by ShenZhen YuLong Electronics Co.,Ltd, utilized an audio grade, special designed switching power supply with high-performance and very low ripple, which assures the U100 having sufficient driving ability and excellent performance in a small size.
The USB data is received and processed with the high-performance TE7220L (USB2.0/24Bit/96KHz), and the decoded I2S signal sends directly to a Cirrus logic CS4398 (120dB dynamic range, ultra low THD+N at -107dB) for DA conversion. The selected components in analog circuit include: ADA4075-2, which is the latest technology by ADI; High-precision SMD CBB capacitors from Panasonic and 0.5% SMD resistors. The power amplifying is done by ADA4075-2 plus a "Diamond" transistor buffer circuit. This simple, efficient and direct coupling mode of the circuit assures that the minimum signal path length, avoiding signal interference and loss during the transmission.
With extensive listening tuning and measurement, the sound from U100 is clear, transparent, delicate and soft, natural. High frequency switching mode power supply used is a key factor for sufficient power, low noise and good transient response.
Functions and Operations:
Connect the external power supply, turn on the power switch on the panel, and the POWER light is on. Connect U100 to PC with the included USB cable, and the PC should automatically recognize and install driver for a new USB Audio Device as “yulongaudio”. Then you can start play music on your PC using this audio device.
Note: When the U100 is connected to the computer, the default volume is fixed to the maximum, and you cannot adjust the volume on the computer. If you want to use the computer to adjust the volume, you can download the adjustable Firmware to update the U100 (Note: The default volume of the adjustable volume is 50%, in this case the U100 performance is not optimized).
Firmware update: Please download the U100VOL firmware and the software of the U100 Brush firmware, use the software of the U100Brush firmware to read the U100VOL firmware and send to the U100.
Warning: When a 3.5mm line in plug is inserted, the USBDAC is disconnected, so U100 is working as a stand alone headphone amplifier. If you want to use USB + headphone amplifier of U100, please make sure that the 3.5mm socket is idle.
Features:
● USB input: USB2.0/24Bit/96KHz.
● Line input (3.5mm).
● Line output (RCA).
● Headphone amplifier output (6.35mm).
● Power Supply: 6-20V DC.
● Internal high-quality switching power supply.
● Cirrus logic CS4398: -107dB THD+N.
● Compact size aluminum alloy housing (160*110*30mm).
● Upgradable firmware for USB.
● Global AC Power Supply (90-250V).
Technical Specification:
● SNR: >120dB
● Dynamic Range: 110dB
● THD+N: 0.0009% @ 1KHz
● Frequency response: 20-20KHz -0.2dB
● Power consumtion: <10W
● Headphone's out power: 100mW/300R
● Net weight: 0.45Kg
● Packing Size: 250*200 *70mm
实测技术指标:
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发表于 2010-11-23 09:10
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