This level liquid sensor electronic circuit diagram is based on a common Ca3410 operational amplifier IC. This level liquid sensor electronic circuit use two plates sensors ( two probes ), one for the high level an one for low level. If the level of the liquid is not in the adjusted range the LED will glow. The circuit require just a CA3410 op
erational amplifier and other few common components. This dual liquid level sensor require a 15 volt DC power supply circuit.