Based on the 50W x 2 @ 4Ω power amplifier of TPA3116, the circuit design refers to the practices of Hack Lab, which perfectly eliminates the POP sound when turning on and off!
At the moment of power-on, the MUTE pin is pulled high to enter the silent mode. After 2 to 3 seconds, the C29 is fully charged and the MUTE pin is pulled low. The power amplifier works normally, and the POP sound at startup is eliminated.
When the toggle switch is turned off, it is connected to the TPA3116 MUTE pin, and the system residual power pulls the MUTE pin high, thus eliminating the shutdown POP sound!
The preamp part uses two NE5532P, which are used to amplify the left and right channels respectively. The front and rear voltage followers are used. For the specific principles, you can check the official manual and the explanation from the hacker!
The HM-M18 Bluetooth module has been added. Due to damage to the module, the Bluetooth part has not been verified yet.
(After the welding was completed, the Bluetooth did not work and the 7805 was very hot. After removing the Bluetooth, it returned to normal. There was no sound at first and I couldn't find the problem. Since I bought a set of materials, I moved the board and welded another PCB board, and finally it was ready. sound)
When making an amplifier for the first time, I made reference to the open source files of Hack Lab, official manuals and many projects on the open source platform. Thank you very much. All the materials for this project are open source. Welcome to discuss and learn from each other!
The V2 version has an onboard CI-C22GS02S offline voice module interface. The control part adopts an extended version and integrates infrared transceiver, but it is not organically integrated with the power amplifier. The reason is that the offline module comes with its own power amplifier and I don’t know how to connect it to the power amplifier board!
After I finished drawing the V2 version, I purchased the components before sampling, and when I got them I found that the 7805 package was wrong. When the order was out of stock, I didn't notice that the original package TO-252-2 (DPAK) was changed to TO-263-2. In addition, the CI-C22GS02S offline voice module was always out of stock, so I redesigned the V3 version and removed it. Offline voice module and Bluetooth module added!
See the project for details!
https://www.bilibili.com/video/BV1h64y1i73P?share_source=copy_web
More details: https://diy.szlcsc.com/posts/06c94d90c2c447dfbd9ed7339ff4a5b1
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