Hi guys and gals, Here's a simple circuit mostly just an LED circuit with a Darlington pair. My question relates to the base current to the probe. If the probe is connected to an unearthed metal toaster (not plugged in), the LED glows briefly then goes out. If the probe is connected to the toaster (plugged in) the LED glows and stays lit. I have my ideas as to what's happening, but I'd really like to hear your explanations. Is this base current Displacement current? Where is the base current loop? https://www.dropbox.com/s/vis4xeuss8u4sw7/Ground%20circuit2.png?dl=0 Sorry, I can't seem to post images. Can someone advise please?