AVT764 A

The system is a universal signaling device reacting to a short-circuit of the sensor. It also reacts to the appearance of resistance between the electrodes of the sensor, i.e. the flow of even very small current, the order of the micro-amperes fraction.
The basic application is work as a water sensor, rain and moisture. Specially for this purpose, a sensor with electrodes in the form of a comb is provided on the plate parts. This fragment can be easily broken off and connected to the rest of the system by wires. You can also use a different type of electrodes, even two pieces of wire or plaque.

The device is especially recommended in places where there is moisture, where you need to control the presence of water

Selected parameters:

• signaling device reacting to shorting the sensor electrodes
• fault indication - sound
• it does not require any startup
• very simple layout, two popular transistors were used
• power consumption in standby mode <1uA
• 3Vdc power supply (lithium battery)
• printed circuit board and documentation included
  A version with a set of independent components is available

Detailed description in