1 IntroductionThe stethoscope is an essential diagnostic device for clinicians, usually used to diagnose cardiopulmonary diseases. However, in order to make a preliminary diagnosis of heart disease, a
NMOS+PMOS controls the battery voltage output1. When MCU_CTL is high, Q5 and Q1 are turned on, and BAT_OUT outputs the battery voltage of 3.7V. This is no problem2. When MCU_CTL is low, Q5 and Q1 are
Designing a wide input DC/DC converter for smart lock applications : https://training.eeworld.com.cn/course/5268This video discusses the unique challenges of powering a smart lock with a wireless inte
When the program executes to read_pcm();, the earphone has sound. Actually, read_pcm(); reads the value of vs1053 register. What's the problem? int main(void) { u16 i=0; delay_init(); //delay function