Frost Alarm or Cold Activated Switch by IC 741
Description:
A simple thermistor triggered cold switch with adjustable threshold.
Notes:
The thermistor used has a resistance of 15k at 25 degrees and 45k at 0 degrees Celsius. A suitable bead type thermistor can be found in the Maplin catalogue. The 100k pot allows this circuit to trigger over a wide range of temperatures…..
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