Heathkit Groundtrack GR-1290 VLF metal detector. 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:
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اقرأ أكثرExample 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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