Ice alarm. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Automobile. Electronic devices
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The icing indicator, by monitoring the ambient temperature, warns the driver about the onset of conditions for the formation of ice on the road in wet weather at temperatures from 0 ° to 2,2 ° C.
The circuit controls the duration of the flashes of the HL1 LED: at a temperature of 2,2 °, the flash is short, when the temperature drops to zero, the flash becomes longer, following once per second. A thermistor is used as a temperature sensor, the nominal resistance of which at 25°C is 15 kOhm.
(click to enlarge)
The thermistor is installed in the enclosure and is in contact with the surrounding air. A2 works as a self-oscillating multivibrator with a period of 1 Hz, sawtooth pulses are taken from the capacitor C1.
Chip A3 is a comparator, the lower the temperature, the longer the pulse duration at the output of A3, the longer the LED flash.
The domestic analogue of the LM3900 chip is 1435UD1.
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