Relay Otomatis

Parts List:
R1,R3 = 10K                     Q1 = 2N3904, or equivalent
R2 = 680K (see text)        IC1 = 4001, or equivalent
R4,R5 = 6K8               D1,D2,D3 = 1N4001, or equivalent
C1 = Try Ur Self               Ry = Relay, 12V
C2 = 0.1uF, ceramic