Kit Detector de Metales DC 3V-5V 60mm Kit Electrónico Sensor Sin Contacto Kit Hágalo Usted Mismo

Alarm mode. Traffic Statistics. Electronic Product Design. hope you could understand. Finished picture Step 5:Install Buzzer and Power socket. Step 2: Install Capacitor:C1,C4=104pF;C2,C3=222pF;C5=100uF.

eBay