Metal Detector Circuit with 9 Volt battery
This circuit from 303 Circuit Elektor Electronics . The LC circuit frequency will change when the metal object altered the Inductance of inductor.
TUP, TUN, DUG, DUS
TUP is Transistor Universal PNP, TUN is Transistor Universal NPN, DUG is Diode Universal Germanium and DUS Diode Universal Silicon , are standard components that most retailers have in stock and have minimum specification that use as general purpose diode and low frequencies transistor with different type numbers and have similar specification.
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