Parts:
R1,R2_____1M 1/4W Resistors R3,R4____47K 1/4W Resistors C1_______10µF 25V Electrolytic Capacitor C2______470pF 630V Ceramic or Polyester Capacitor D1-D3____1N4002 100V 1A Diodes Q1-Q3_____BC337 45V 800mA NPN Transistors RL1_______Relay with SPDT 2A @ 220V switch Coil Voltage 12V. Coil resistance 200-300 Ohm J1________Two ways output socket Sensor____Aluminium or copper thin sheet with the dimensions of a post-card, glued at the rear of the same (approx. 15x10.5 cm.) Thin screened cable
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