Metal Detector Circuit Diagram Using Transistor

Four transistor metal detector schematic.

Metal detector circuit diagram using transistor.

The circuit can sense a soda can at a depth of six inches and metal pipes at an even greater distance. 1 x tda0161 proximity detector ic. This metal detector sensor project is easy to make and is an application of colpitts oscillator. The unit is powered by two 9v batteries in series.

The circuit is claimed to be tested but the difficult part in building this circuit is with winding the tapped coil. 2 x 47nf capacitors ceramic capacitor code 473 1 x 1 kω resistor 1 4 watt 1 x 330 ω resistor 1 4 watt 1 x 100 ω resistor 1 4 watt 1 x 5 kω potentiometer. As a result the batteries should last a long time. Circuit diagram working explanation.

1 x 2n2222a npn transistor. A simple metal detector circuit diagram and schematic using a single transistor and a radio. There are many metal detector circuits or kits are available to built but mostly are very complicated but the circuit shown here can be built easily and can detect a metal object from 2 to 3 inches away. The detector has a current draw of approximately 9 ma at 18 vdc.

This is just a colpitts oscillator working in the medium band frequency with a radio to the same frequency. Surprising enough i found many metal detector circuits that work only with a help of a single transistor like the once shown below this circuit uses a single bc547 npn transistor.