Parts List:R1,R3 = 220 IC1 = 555, timer/oscillatorR2 = 470 D1 = 1N4001, general purpose diodeR4 = 27K Led = Red, high brightnessP1 = 7.5M, potentiometer S1 = Push switch, momentary offC1 = 220uF/25V, electrolytic S2 = Push switch, momentary onC2 = 470uF/16V, electrolytic Ry1 = 6-9VC3 = 0.001uF (1nF),ceramicC4 = 10pF to 0.001uF, ceramic
Notes:
C4 may not be needed. Add only if relay ‘chatters’. Value can be up to 0.001uF.
Led will be lit when relay is “on”.
Copyright © 2005 – Tony van Roon
