Posted on May 11, 2012

This circuit is designed to detect the presence or absence of aqueous fluids. An ac signal generated on-chip is passed through two probes within the fluid. A detector determines the presence of the fluid by using the probes in a voltage divider circuit and measuring the signal level across the probes. An ac signal is used to prevent plating orills solving of the probes as occurs when a de signal is used.

Click here to download the full size of the above Circuit.

A pin is available for connecting an external resistance in cases where the fluid impedance is not compatible with the internal 13Kohm divider resistance.

Leave Comment

characters left:

New Circuits



Popular Circuits

Wide frequency oscillator
Stable optocoupler
2x30watt home amplifier circuit
capacitor Choosing components for a triacs snubber
simple and cheap dark detecting led
Features and Power Control Circuit
Effective Load Resistance
8-bit bus control widely used 12-bit DA converter Universal