Portable Wireless Headphone Amplifier & DAC
我的设计，采用2.4GHz数字音频无线模块，工作在328英尺的距离，3个锂离子电池。并转换为负12V的。结型场效应管+ MOSFET的放大器。 DAC，具有WM8740。测试结果：
5 V峰值：0.003％1.THD（新的测试300ohm负荷1kHz时）
2.S /信噪比：“86dB的
The transmitter, the receives digitized (USB and S/PDIF)stereo audio and analog stereo audio as input, Support uncompressed (16bit,48KHz)digital wireless transmission, DSSS digital modulation and demodulation, 2.4GHz ISM Band (Default frequency: 2412MHz, 2437 MHz, 2462MHz). The main IC includes:96-kHz, 24-Bit Digital Audio Interface Receiver(TI DIR9001PW);Asynchronous Sample Rate Converter (CIRRUS LOGIC CS8421-CZZ);Stereo A/D Converter (AKM AK5381).
The Receiver (headphone Amp),Output stereo audio, The built-in lithium-ion battery is rechargeable(12V,2400mAh),All field-effect transistor (JFET+MOSFET) Class A amplifier,Operating distance is more than 100meter(328feet),The main IC includes:24bit Hogh performance 192kHz Stereo DAC (Wolfson WM8740);Low-Noise Dual. Operational Amplifier(JRC njm2114m).
THD at 5 V peak: 0.003%(300ohm load 1kHz)
S/N : >90dB
