measurment

Hello, I am designing a low cost solution for measuring voltage on the mains 220V with a precision target of 0.1V. My requirements are 4kVrms galvanic isolation between mains and the low voltage circuitry. I am measuring the output signal using an esp32 The transformer should be small and...

Hi guys, decided to ask. maybe someone came across this, but I did not find how to identify a damaged element. In general, I need an element identification. since many manufacturers of SMD components it is very difficult to identify them without special expensive equipment. The circuit...