Group items tagged 
I. Types of microphones: Microphones are generally divided into dynamic coil type, crystal type, carbon particle type, aluminum ribbon type, and condenser type according to their structure. The mos...
In my years of working with hardware entrepreneurs I've seen too many cases of poorly designed Printed Circuit Boards (PCB) that would never be of sufficient quality for commercial production.In so...
Medical stethoscopes are "standard" for doctors, either tucked into white workwear pockets or hung around the neck. But you may not know that what looks like a small stethoscope is a lot to carry.E...
Do fabric face masks actually work?Yes and no. They're not as effective as N-95 masks for people treating COVID-19 patients in hospitals. That being said, they're still useful because hos...
LED light bar is by an LED light source, the control unit (power supply), the light distribution of components and the shell lighting lamps and lanterns, the LED light source consists of a single c...
