วงจรตั้งเวลา(1-20ชม.)
R1 = 2K2 IC1 = 555, timer
R2 = 39K IC2 = 14017, decade counter
R3 = 470K (pot) IC3 = 14020, divider
R4 = 1M Q1 = 2N3906
R5 = 27K D1 = 1N4001
R6 = 6K8 D2 = 1N4001
C1 = 0.12µF, ceramic S1 = Push switch, momemtary on
C2 = 1.2µF, polyester S2 = 3-step/2-deck rotary switch
C3 = 0.1µF, ceramic Ry1 = 12V
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