activating an LED and a peizo buzzer when sense a magnetic field.

The heart of the circuit is a US1881 Hall effect sensor. A hall effect sensor is a magnetic field sensor that provides an output voltage when detects a magnetic field. Its output voltage is proportional to the detected magnetic field.

The circuit is simple to build and using only few components. The transistors are used to amplify the output signal of the US1881 hall sensor and drive the peizo buzzer and an LED. The circuit can be operated from 5V to 12V DC.
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The figure below shows a project of simple magnetic field detector or sensor circuit that can detect a magnetic field around. The circuit is very useful and can be used for variety of purposes like it can be used to detect the magnetize objects, hidden magnets etc. It will provide a visual and sound indication by
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Simple Magnetic Field Detector Circuit Diagram