I am very new to ECE and when i googled circuits for the beginner and this was one of them.
So far i have a basic knowledge of transistors and that they exist. please correct me if i am wrong.
Current flows to junction 1 and ignores it because transistor is currently off.
current flows to water sensor and if it is not sensing any water means that the circuit is not active.
in case there is water, at junction 2 current activates the DC 548 transistor.
i assume after that current from junction 3 goes in to the ground.
At the same time, at junction 1 current starts to flow towards junction 4 and 5 which activates the speaker.
Capacitor is connected between junction 4 and junction 2 is there to act as a some kind of short battery to make the sound to decay nicely instead of weird crackling.
Question: Also i have a thought that capacitor could be use as some kind of oscillator but i don't see how would it work in this circuit.
i started to learn electric circuits this morning so please be gentle.