Taking the LwIP source code as the core, it explains the implementation of the TCP/IP protocol stack, explains common network protocols, and explains the data transfer between LwIP layers. Finally, supplemented by practical cases, it teaches you how to connect to major cloud platforms, supporting the Wildfire STM32 M4 /M7 series development boards provide complete source code and are highly operable.
The first line has MH603 printed on it, and the second line has 120906 printed on it. It is a chip that drives the speaker. Let's see if anyone has the data for this.
As shown in the figure, a single-chip microcomputer is used to control the reset of the peak holding circuit . But why is Q2 used? Can't the transistor Q1 be used directly to pull it down? And what is