Recent content by vugo

Got it. But what exactly happens when the base is floating? Does it float at about this voltage (so that the noise voltage generated by the body pushes the B-E diodes into conduction on positive excursions)?

waht: yup, that's the circuit, with resistor replaced by an LED, and base kept open. Bob S: Just tried what you suggested, and that worked! Now there is no glow when I touch the base of Tr1. Although- with the pulldown installed, shouldn't the current generated by the body antenna still...

I was trying a simple Darlington circuit with two Darlington-connected NPN transistors. There is an LED in the shorted collectors, connected to a 5V supply, and the base is open. The trivial objective was to see that when you touch two fingers to the base and the supply positive, the LED turns...