The Simplest and Most Stable Metal Detector - Only 8 Electronic Components

The Simplest and Most Stable Metal Detector - Only 8 Electronic Components $2 for 1-4 layer PCB and PCBA from $0（Free Setup, Free Stencil ) : 👉Circuit diagram__________________: 👉 👉Gerber File__________________: 👉 A list of materials__________________: 2X BC547 - 1X Buzzer - 1X LED - 1x 220R - 1X 50K Trimpot - 1x 4.7 nF - 1x - 1X 22 pF - 1x 100 nF -