Hydro alarm circuit diagram using CMOS


Posted on Feb 5, 2014

Circuit diagram is very simple and works as follows: N1 Schmitt trigger works as an oscillator and produce a frequency of about 1 kHz. If in the tank is still enough water, then alternative voltage go from electrode A to electrode C. After rectified of diodes D1 and D2, at the pin 13 of the N4 reaches trough the D3 a logical `0`. By this, the osci


Hydro alarm circuit diagram using CMOS
Click here to download the full size of the above Circuit.

llator sound N4 and buzzer are disconnected. If the water level drops into such an extent that electrode C is no longer in contact with water, then blocking of N4 is suspended and buzzer starts to sound at regular intervals. Alarm duration is determined by the oscillator capacitor N3 and C6. The alarm stops as soon as the tank fills and electrode C is again in contact with water. If S1 button operates before filling D5 LED lights as soon as water reaches the electrode B. D5 turns off after about 10 seconds to load is not too much power. Supply voltage can be between 5 and 15 V. If you choose a voltage lower than 9 V, the electrode surface C must be much higher than that of electrode B. This necessary because there is loss of signal from the electrode C in diodes D1. D3.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Light Transmitter
    Touch Switch Circuit
    Simple Audio Mixer Circuits
    simulation Understanding a high voltage generator circuit
    irbot
    gic
    TV cascades
    NE5534 Integrated Circuits
    The use of a motor control switch automatic circuit a mutual investment



    Top