Simple Single Chip Metal Detector Circuit based on IC CS209A

Simple Single Chip Metal Detector Circuit

This is a simple single chip metal detector circuit based on IC CS209A  which is from the Cherry Semiconductors. A 100uH inductor coil is used to sense the presence of metal. The IC CS209A has a built-in oscillator circuit and the coil L1 forms a part of its external LC circuit which determines the frequency of oscillation.

 

simple single chip metal detector circuit

simple single chip metal detector circuit

The 100uH inductance of the coil change in the presence of metals and the resultant change in oscillation is demodulated to create an alarm. The LED gives a visual indication too. This Simple Single Chip Metal Detector Circuit can sense metals up to a distance of few inches.

Simple Single Chip Metal Detector Circuit notes

Assemble the circuit on a general-purpose PCB.
The switch S1 can be a slide type ON/OFF switch.
The IC must be mounted on a holder.
The POT R1 can be used to adjust the sensitivity of the circuit.

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