Relay Timer switch

Relay Timer switch

Circuit Description

In Fig.1 see 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.

Circuit diagram

Circuit

Part List

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

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