Timer switch circuit

Posted on May 16, 2012

A 100 second delayed turn ON relay RL1 switch, if plug power +12V in circuit. In Fig.2 see a two range 6-60 second and 1-10 minute auto turn off relay timer circuit, with 555.

Timer switch circuit
Click here to download the full size of the above Circuit.

Part List R1=1 Mohms C4=100nF 63V IC2=LM555 R2=330 Kohms C1-2=100uF 16V RV1=470 Kohms pot. R3=680 ohms C3=1000uF 16V RL1-2=12V >120 ohms Relay R4=2.2 Kohms D1=1N4148 S1-2=Push button n.o R5-7=4.7 Kohms D2-3-4=1N4001 S3=2X2 switch R6=47 Kohms Q1=BC214 R8-9=22 Kohms IC1=LM741

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