Small Metal detector schematic circuit

This metal detector circuit needs to be powered using a 9 volts power supply ( DC) or a 9 volts battery. The C1 capacitor is a variable capacitor with a value of 365 pF, C2 is a 100pF silver mica capacitor, C3 is a 0.05 uF disc capacitor and the C4 is a 4.7 uF capacitor. The Q1 transistor can be RCA SK3011 npn transistor or equivalent type and all resist..

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