# Sixth Lichuang Electric Competition #PAM8407DR two-channel audio amplifier

Note: * is required

Please fill it out during the registration stage↓

* 1. Introduction to project functions

DIY project, Class D amplifier can drive two-channel 3w speakers. Excellent sound effect, low distortion, small size and easy to carry

USB can be used as a power source and can be used as a mobile phone or computer speaker.

*2. Project attributes

The original project is made public for the first time, and the actual object will be defended at the school.

* 3. Open source agreement

GPL3.0 open source agreement

Please fill in during the competition stage↓

*4. Hardware part

Lichuang EDA,

Power supply part: The power supply interface uses a USB interface, 5V power supply, and the switch uses a patch DIP switch. First filter through the filter capacitor.

Audio access: I chose a 3.5mm plug-in headphone holder, with pin 1 connected to ground, pin 23 connected to the left channel, and pin 34 connected to the right channel.

Audio amplification circuit: PAM8407DR is used as the power amplifier IC. This chip has a pin for adjusting the volume. A touch switch is used as a button for adjusting the volume. A passive filter is connected behind it to improve the sound effect and reduce distortion.

*5. Software part

none

*6. BOM list

Note: BOM list involved in the project. Please upload a screenshot of the BOM at this location. Please upload the list details in PDF format to the attachment. Suggestions include model, brand, name, packaging, procurement channels, usage, etc. The specific content and form should be based on clearly expressing the project composition.

*7. Contest LOGO verification

* 8. Demonstrate your project and record it as a video for uploading

Video has been uploaded

More details: https://diy.szlcsc.com/posts/06c94d90c2c447dfbd9ed7339ff4a5b1