Water Sensor Circuit with Alarm If you are looking for a Water
level indicator or a Water level controller, there are pretty
good circuits we have developed. This one is just a fun project
made for hobby purpose! You can call this a water sensor circuit
for sure! This is a simple musical alarm circuit which produces
a musical tone when water or some conducting liquid comes in
contact with the two sensor wires provided. The circuit is based
on four transistors and one melody generator IC (M 3482). When
water comes in contact with the sensors wires A & B, the base of
Q1 gets connected with the negative and it conducts. This makes
Q2 and Q3 ON. When Q3 is ON the power is available for the music
generator circuit and it starts producing 12 different melodies
one after another. The music continues as long as there is water
between the sensor wires. The POT R12 can be used as a volume
controller. Circuit diagram with Parts list. - Assemble the
circuit on a good quality PCB or common board. - Two insulated
aluminum