| 摘要 |
Electronic circuit intended for the detection of magnetic fields of any origin which functions when, the general switch being connected, it approaches a magnetic field of a cell (reed switch) which in turn allows the passage of an electric current originating from a continuous-current (direct-current) source, via an LED/resistance element which is in parallel with a buzzer, giving rise to the switching on of the LED and the emission of a sound signal by the buzzer.
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