Leak Detector

  
High sensitivity, portable temperature comparator. This sensitive circuit is basically a comparator, detecting very slight temperature changes in respect to the ambient temperature. It was primarily intended to detect draughts around doors and windows that cause energy leaks but can be used in many other ways, when a sensitive temperature change detector is needed. Two LEDs are used to signal if the temperature change is pointing above (Red LED) or below (Green LED) the ambient temperature. Detects draughts around doors, windows, etc.
Leak Detector - schematic

IC1 acts as a bridge detector and amplifier: its output voltage raises when temperature increases and vice-versa. This happens because the n.t.c. resistor R2 reduces its resistance value as temperature increases and vice-versa, therefore unbalancing the b



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