Circuit Diagram
GIVES BEEP WHEN WATER IS IN CONTACT WITH THE WIRE
Description
Description
Water is a conductor of electricity. When water is in contact with
the probe then there is a flow of current which reaches to the base of
Q1. Transistor Q1 is a NPN transistor which conducts. With the
conduction of Q1 electron reaches to Q2 which is a PNP transistor .Q2
also conducts and current flows through the speaker. In a speaker there
is inductive coil which causes motion in one direction and also produce
induce current which is in opposite direction to the flow of current
this induce current in the form of pulse flows through a capacitor,
resistance and switches off Q1 and relax .this process repeats again and
again till probe is in contact with water or we can say there is a
oscillation in the circuit thus speaker diaphragm vibrates and gives a
tone. Frequency of the circuit depends on the value of Speaker Coil
impendence, Capacitor and Resistance Value.
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