Metal Detector Circuit Diagram Using Transistor

As a result the batteries should last a long time.

Metal detector circuit diagram using transistor.

This is just a colpitts oscillator working in the medium band frequency with a radio to the same frequency. The unit is powered by two 9v batteries in series. 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. 1 x 2n2222a npn transistor.

The circuit can sense a soda can at a depth of six inches and metal pipes at an even greater distance. Four transistor metal detector schematic. Here is a simple metal detector circuit using a ca3140 ic. A simple metal detector circuit diagram and schematic using a single transistor and a radio.

Circuit diagram working explanation. The circuit is claimed to be tested but the difficult part in building this circuit is with winding the tapped coil. The above circuit diagram is of a low cost metal detector using a single bc548 transistor and an old radio. This metal detector sensor project is easy to make and is an application of colpitts oscillator.

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. The detector has a current draw of approximately 9 ma at 18 vdc.