Chip: PCM2912
To better understand PCM2912, you can download the relevant information by clicking on the link below:
PCM2912 chip introduction
PCB: double panel
Dimensions: want to be installed in the U disk shell, exquisite and beautiful
The following is a physical map of the board:
Let me give you a look at the schematic:
Next is the PCB design:
3D drawing of PCB design:
Component list:
Outer U disk shell:
The sound card starts working:
Debugging experience:
1. Since the size of the earphone is not correct, the circuit board earphone holder is a little small, and it is necessary to use a frustrating knife to defeat the circuit board earphone holder 0.3MM.
2. Do not use the two positioning posts of the earphone and remove them with a blade.
3, PCB width is a bit wide, if you want to install the shell, you also need to use the rake to modify the width of the PCB, you also need to repair with a knife
Under the outer casing, the inner diameter of the outer casing is increased. When I do the PCB, there is no outer casing, according to the size given by the merchant.
The result, the merchant gave me the outer diameter, sloppy once! ! !
4, where U1, Q2, R19, R20, R7, R9 do not need to be welded, it is my function to debug its function, if you only want to work
Can not pick up. Q2 It seems that I also forgot, sorry, use the 8050 triode.
5, I did not know the audio interface at the time, check the map online, see this information, the drawing:
I used this as a headphone holder, and the result is a headphone plug, the real picture:
When I draw the circuit, the earphones are all buttocks. This is a mistake. But no need to change, there will be sound, but left and right
There is a difference between the roads, and everyone will carefully distinguish them.
6, the crystal is originally a patch, but when I bought the store only plug-ins, there is no way, I have turned around in the electronic city.
7, as a slight change above, insert will find new hardware.
I used this as a headphone holder, and the result is a headphone plug, the real picture:
When I draw the circuit, the earphones are all buttocks. This is a mistake. But no need to change, there will be sound, but left and right
There is a difference between the roads, and everyone will carefully distinguish them.
6, the crystal is originally a patch, but when I bought the store only plug-ins, there is no way, I have turned around in the electronic city.
7, as a slight change above, insert will find new hardware.
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