water level indicator circuit schematic


Posted on Feb 6, 2014

When the water-level is below the steel rods, no contact is occurring from the metal can and the rods, which are supported by a small insulated (wooden) board. The small circuit built around IC1 draws no current and therefore no voltage drop is generated across R5. IC2A, IC2B and Q1 are wired as a window comparator and, as there is zero voltage at input pins #2 and #5, D3 will illuminate. When the water comes in contact with the first rod, pin #13 of IC1 will go high, as its input pins #9 to #12 were shorted to negative by means of the water contact..


water level indicator circuit schematic
Click here to download the full size of the above Circuit.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    1300 Mhz Frequency meter with prescaler
    500W low cost 12V to 220V inverter
    audio Smallest circuit to make a sound
    P8 CPU Documentatio Hardware
    led flasher circuit schematics
    Video/Audio Wireless Transmitter
    2N4401 NPN General Purpose Amplifier
    Sonic depth finder of the amateur fisher
    REMOTE TELEPHONE BELL RINGER
    Integrated operational amplifier tone control circuit of a simplified equivalent circuit a



    Top