Hello Everyone As the title asks is anyone using the dave Bodnar design for a CT current sensor? I have built one of his circuits and it works but the locos I have need the lights on for it to signal an occupancy. I have tried testing it by laying resistors across the rails all the way to 1M ohm and cannot get it to sense an occupancy. His website said that it sensed a 2k ohm resistor but mine is no were near that sensitive. I have the arduino using the digital input_pullup sketch just to test it. Is there some math or something that needs to be used to increase sensitivity?