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    Fig. 1: Heathkit GR-1290 VLF metal detector schematic diagram . Parts list ICs: U1: CA3130S (BiMOS Operational Amplifier) U2, U3: LM308 (Precision operational amplifiers) U4: LM2901 (Quad Single Supply Comparator IC) Transistors: Q1, Q4, Q9, Q10, Q11, Q12: MPSA20 (NPN 40V 100mA) Q2, Q7, Q8, Q13: MPSA55 (PNP 60V 500mA) Q3, Q5: 2N4117 (N-channel JFET transistors) Q6: MPSA13 (NPN

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    Example VLF design: Heathkit Groundtrack GR-1290 VLF metal detector Pulse Induction (PI) metal detectors are sending repeated pulses of electrical current to the search coil, producing a magnetic field. The coil transmits a pulse toward the ground, generating an answering pulse from the target object.

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