Electronic circuits that use the 555 Timer

555 Timer Circuits

555 Timers are fun and a great way to start learning electronics

Metal Detector Circuit

A circuit that detects metal and also magnets.

Overview

When a magnet is brought close to the 10mH choke, the output frequency changes.

Schematic

Metal Detector Circuit

Parts List

1x - NE555 Bipolar Timer
1x - 47K Resistor (1/4W)
2x - 2.2?F Electrolytic Capacitor (16V)
1x - 10?F Electrolytic Capacitor (16V)
1x - 10?F Electrolytic Capacitor (16V)
1x - 10mH Inductor
1x - 8 Ohm Speaker (1/4W)
1x - 9V Voltage Battery


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