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

    LCD Caller ID with AT89C2051
    Capacitance switched light
    Led Millivoltmeter
    Optoisolator
    Cheap Motorcycle Alarm
    motion detector sensor circuit
    1KHz IR transmitter circuit
    microcontroller 16f707 capacitive touch button
    Hot Tub Hack
    In System Programming (ISP) for ATMEL chips
    GBPPR 1 GHz RF Spectrum Analyzer
    Precision QRP Transmitter
    25kHz using thyristor inverter welding machine circuit
    Fan motor driving circuit



    Top