Very low frequency signals will pass through still but are filtered some more with the 0.1uf ceramics then it will still sense ac mains at a lower response with the flux concentrator core removed than it would with the core left through the coil.
Now the vlf receiver section that will allow the signals from the sense head section to pass through. The crackles will indicate that and the ac environment well it would sense that but at a lower response to it unless you re insert the flux concentrator core then the hum from ac mains will be increased a lot. If you was to take it out the sensitivity and strength of signal would drop but then your in another mode as the circuit would still act as a lightening detector sensing lightening.
The coil with its inductive nature pending on the amount of winds of thin wire and also the flux concentrator, this concentrates the em flux when a signal is induced into the coil and it increases sensitivity more. The sensing signal booster on the far left hand side I bread boarded that to test it to see if I can get more signal boost with it, Not very good at the technical explanation well ill give it a go. I've even used a gravity wave detector circuit added to it and also other experimental circuits This is my modifications to the vlf receiver circuit to sense lightening and em pulses and signals Now this is what the circuit looks like without the upgrades and modifications. This is the vlf receiver circuit that I've upgraded and modified it senses ac fields lightening and even receives ship and aircraft radio too. VLF Receiver for Sensing Lightening and other Tiny LF signals
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