Excuse me, 1. The picture on the left side of the orange area is filter/release of square wave is part can signal, what is this circuit, should how specific values? 2. The L2 and L6 the two inductance how to select value? 3. The area is on the right side of the orange + 12 v power supply parts, is this part of the PI type LC filter, why a diode? C19 and RX2 is redundant? Thank you bosses!!!!!!