voltage sensing

Hello all, I have an inverter stage that I need to monitor its output voltage, a friend suggested the circuit below but I didn't understand how it works and why he chooses these values in particular. What circuit do the opamps form? What would the output look like? What is the purpose of the...

Hi. I was wondering if someone has ever constructed a Switch Mode Power Supply using isolated voltage and current sensors connected to a Microcontroller. If so: What device (Voltage/Current) have you used and using what protocol ( i2C / SPI etc ) ? What sampling rate could be achieved ( 200kHz+...

I need a circuit to flash an LED. The battery is 3.6v 1A, this powers a fairly dim 2.5v micro LED (probably a very low current), I don't think this alone could power a flashing LED circuit, so I want to piggyback off of this LED to trigger the circuit to flash a 3.6v LED. So I'll have a 3.6v...