A simple metal detector is a search-coil oscillator that changes frequency when metal approaches, followed by a detector that drives a buzzer or LED.

No schematic or PCB changes were made; the project remains empty. A practical beginner version would use a 555 timer, hand-wound coil, frequency/comparator stage, sensitivity adjustment, LED, and buzzer. Building it requires choosing the target range and power source, then capturing and verifying the circuit.

Execution stopped because your ACUs ran out.