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 Home » Sensor » Frost Alarm
18:10
Frost Alarm    
The thermistor used has a resistance of 15k at 25 degrees and 45k at 0 degrees celsius. A suitable bead  type thermistor is found in the Maplin catalogue. The 100k pot allows this circuit to trigger over a wide range of temperatures. A slight amount of hysteresis is provided by inclusion of the 270k resistor. This prevents relay chatter when temperature is near the switching threshold of this circuit.



Category: Sensor | Views: 974 |
 
 
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