Hi mustefa ubram
The signal coming from the VCO of IC1 goes to the TR2 base and then it's amplified by TR3 and TR4, the TR4 collector goes to phase comparator of IC1 with the out of VCO. At pin 2 of IC1 there is a signal corresponding to phase difference, this signal is inverted and amplified by Ic2. Part of signal of VCO goes to ground by C10 - C11 and L1. The "phenomenon" changes the phase and the amplitude of the signal. This Lrl detects the phase change while my previous Lrls detect amplitude change. In my test field I have a strong signal at about 3 m from my buried silver coin and also near the target if I take the antenna perpendicular to the ground. Obviously the Lrl detects also other signals, near radio transmitter and at home, but in open field there are very few "strange" signals.
Best Regards
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