Road ice alarm circuit diagram
Source: InternetPublisher:黄土马家 Keywords: Alarm control Updated: 2021/11/29
This circuit uses a thermistor and three parts of the LM3900 quad op amp IC. When the temperature drops to 36°F, the LED indicator flashes approximately once per second. When the temperature drops to 32°F, the blinking frequency speeds up and the LED remains bright. Amplifier I compares the thermistor to a standard network resistance and is connected to the non-inverting input.
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