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How to build Relay Timer switch
August 8, 2010 - category: TimerDescription
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
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
circuit from http://users.otenet.gr/~athsam/relay_timer_switch.htm
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