The range of this circuit is very small, serving only for applications that involve the location of objects, but nothing prevents the power stage of the circuit from being modified, always considering the legal restrictions that exist for the operation of this type of equipment. L1 and L2 have 3 and 4 turns of wire 28 or 26 in the form of a ferrite of 0.5 cm in diameter. The circuit is from 2008 documentation and the supply is made with 1.5 V.
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