Roff
Well-Known Member
I think he's asking if the loop will work without grounding the other end, and I think the answer is, not very well. He could tweak the series resistor (100 ohms) to adjust the sensitivity, once he starts to test it. If it works without the GND, so much the better. He did say he wants less than 10cm range.Nigel Goodwin said:bananasiong said:why must the output of the 555 timer (after the 100R) be connected to the GND (-ve terminal of the battery)? can i connect it to nothing? as an antenna..
It's not connected to ground, it's connected to an 'antenna', a loop of wire which surrounds your area as you required.