Water Sensor Circuit with Alarm
Description
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 wires can
be used as the sensor.
- The IC1 must be mounted on an IC
holder.
- The speaker can be a 8 Ohm, ½ W tweeter.
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