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Frequency filter. It will help reduce radio interference from running generators. Also, its function includes smoothing of external interference.
Electronic amplifier. It is necessary to receive the final signal using an external speaker or headphones. Instead of headphones or a speaker, you can use indicator lights assembled on the basis of LEDs. Alternatively, supplement the existing scheme with these elements. This will allow you to determine the find when working in particularly noisy areas due to an additional option - a light indication.
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It is very important to create this element on a plate made of PCB. This will help to rigidly fix the radio parts and avoid burning out the base during soldering. The schematic diagram below must be printed on a printer. Next, you need to transfer the drawing to copper foil and carefully cut. The resulting scheme is superimposed on the textolite base. At the final stage, the workpiece is processed with a hot iron. Thus, the copper part is fused into the surface of the PCB. In the places of connection of radio parts, it is necessary to make holes with a thin drill or awl.
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