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This is a water sensitive circuit diagram.I suppose this circuit will give you lots of benefits .I have modified this circuit up to some extent and have added to our water pump moter (230 v) I think you also can use this circuit for various purposes.Here I have used common IC Bc109. When you fix the sensor Don't forget to fix it over the water level.This circuit operates with 4.5V to 6v.If you want to operate your water pump 230V 0r 110V you can use a rellay for that.Then this circuit will switch on or off that rellay( use 6V rellay) Note # Use a PCB to build this circuit # Don't supply more than 6V #Don't forget to fix the sensor over the water level

Here I have design a touch sensitive circuit diagram.For this circuit I have used a common transistor BC 547.Normally this circuit can be operated with 4.5 to 6 v.I suppose you will be able to do lots of things with this.I have used this circuit for my room light.So you also can use this circuit for your room light. Note # Use a pcb to build this circuit # Don't supply more than 6V