[Verified] PCM2900C usb recording sound card

# 1. Description


### This mini module is designed to solve the problem of internal recording of guitar sounds. The BOM cost is expected to be less than 20. The schematic diagram copies the reference design of PCM2900C, simplifying the audio output function and retaining only the recording function. Thanks to the group owner for providing the schematic diagram. For learning only, no commercial use.
### After the patch is completed, connect it to the computer. If you see the (USB AUDIO CODEC) device appearing in Settings-Sound, it means it is normal.
### Listening experience: clear, bright, warm and atmospheric, this is real music (
![Patch completed] ![QQ picture 20230205013056.png] ![Settings-Sound] ![QQ picture 20230205010807.jpg]


# 2. Known problem


### The guitar audio cable is a mono output, so when using headphones to monitor, you can only hear the sound in the left ear. Maybe it can be solved through software effects

# 3.Update
# . ## For electric guitar, you can use the bias fx2 software effector to convert mono to stereo. It sounds pretty good, hehe.
### If you record and monitor at the same time, you can feel the obvious delay. Maybe hid is not fast enough?