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I tried to separate analog part from digital and right place ground wires to eliminate interferences. First I drill holes for crystal, wires, connectors and buttons. Next I solder SMD connector, wire junctions and finally all components from a top side.

For transferring of digital audio within equipment is much better I2S bus. Schematics diagram schematics version 1. Low and middle frequencies are perfect, but highes frequencies are a little blurred.

Advantage of interface is that only one wire is needed for transferring of complete audio signal. Transfer speed is taken from sample frequency, number of bits and number of channels. I built circuit in two copies and both works on first connection.

Just it isn’t HiFi, but for most people will be quality of sound output sufficient.


B 데이터시트(PDF) – TI store

Shield wire we connect with SMD jumper to the ground. Schematics is almost identical to PCM datasheet. These components I solder that after right position I hold them with nail, small screwdriver or tweezer. Almost all components and USB connector are placed from bottom side.

This I must more inspect. This makes symmetrical output with impedance about R.

75176b datasheet ePub download

It is simultaneously disadvatage, because receiver must reconstruct clock signal from data with PLL and there can rise jitterwhich is heared like a small distortion on the output of DAC.

Next I solder first side. PCB is designed for easy creating in amateur conditions.

Effect is, that almost all pins are shorted. PCB is designed for using only one side with two wire junctions in Eagle 5 application.

Connector is usually XLR with three pins with central third pin connected to the ground.

For usual operating systems like Linux or Windows XP are not needed any drivers. Circuit description Schematics is almost identical to PCM datasheet. There exists too professional variant AES3.

75176B PDF Datasheet浏览和下载

Output impedance will be about 72R. If there are anough colophony that pins automatically unjoin thanks to surface tension. We can use too 3 HID buttons for setting volume and mute.


Next I must use copper solder wick for draining of tin out. Analog output has a good sound without interferences and he is better than usual internal soundcards on PC motherboards.

Component view Printed circuit board PCB is designed for using only one side with two wire junctions in Eagle 5 application. If the component is on the right place, I solder them on the opposite side and finally on the first side.

Headphone output uses standard 3.

USB audio DAC with PCM

It is seen as standard USB soundcard. B output from B we leave unconnected. I put circuit on right place, solder one pin in the corner and next solder all pins on second side with thin tin. It should work too volume settings using buttons. Circuit includes these components: