Hello, i have this circuit from here that the transmitting side creates a high oscillating magnetic field the induces current into the receiving side and lights an LED. I want to learn exactly how this works and i will have a pic of the cicuit below.
According to the website "1.5v conventionally flow through the top coil on the transmitting side through R1 to the base of the NPN transistor, through the emitter to ground. Which turns on the transistor The transistor then discharges the inductor as the emitter is connected with the ground. That is what creates the oscillating field."
My question is when the circuit is first powered, the top 17-turn coil builds up a magnetic field and once current flows through it and goes through the resistor, transistor to ground. Is the magnetic field built up in the top coil what discharges through the bottom coil through the collector and emitter to the ground?
So first, the coil goes from the 1.5v in the upward direction and goes through the base, then downward from the magnetic field built in the top coil and it goes through the bottom coil, collector the emitter to the ground? Up and down.