Thursday, May 6, 2010

Low Cost Metal Detector Circuit

Metal detectors are usually very complicated and it may be consist of very costly components and metal detector DIY circuits are rare. However this metal detector hobby circuit can be constructed by only a few components such as BC548 and an ordinary AM radio that we usually use.

Click on the image to enlarge

This metal detector schematic shown in the figure oscillates according to the frequency of any tuned AM radio. When the circuit powers up, the radio will not produce any sound because the radio oscillatory and the the metal detector oscillator will be in the same frequency and each will cancel itself.


We all need to adjust the frequency of electronics circuit of metal detector to the tuned radio frequency. Whenever a metal part come aside the circuit, the cancellation of two signals stops and the radio starts producing sound.

Important: Never assemble the circuit in a metal cabinet. Do the circuit on a common PCB and assemble in a plastic cabinet.

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Anonymous said...

a great simple metal detector circuit,but you dont give the read coil details,is it 200 turns on a plastic former of about 8 inches in diameter.? gary jenkins cambridge.

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