Temperature sensor circuit diagrams
A simple device to indicate various levels of hot water in a tank.
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Beeps if you leave open the door over 20 seconds
3V battery operation, simple circuitry
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Controlled by indoor and outdoor temperature
Simple, high reliability design
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Remote sensor sends data via mains supply
Temperature range: 00.0 to 99.9 °C
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Suitable for computer cooling fans. LED motor speed indicator
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A simple op-amp circuit that will trigger a relay when a preset temperature is reached. Please note that there is no hysteresis in this circuit, so that if the temperature changes rapidly, then the relay may switch rapidly.
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High sensitivity, portable temperature comparator Detects draughts around doors, windows, etc.
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This circuit controls very accurately a fan of any size. Just adjust the associated resistors for a different type like the R6 resistor of 100 ohm, 2 watt type and you're all set. The above circuit diagram is for a small 12 volt fan, the size and type determined by the user.
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A simple thermistor triggered switch with adjustable threshold. It triggers with cold temperatures so may be used as a frost alarm or cold temperature switch.
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Gradually increases speed as temperature increases Widely adjustable temperature range
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