A Thermostat With Adjustable Hysteresis

Posted on Apr 11, 2012

A thermostat doesn't try to maintain a constant temperature. In order to do so - it would have to keep switching on and off every few seconds. Instead - it keeps the temperature within a specific range. When the preset temperature has been reached - it switches off. And it only switches on again - when there has been a significant change in temperature.

A Thermostat With Adjustable Hysteresis
Click here to download the full size of the above Circuit.

The difference between the temperature at which the thermostat switches off - and the temperature at which it switches on again - is the hysteresis. Without this hysteresis - your central heating, refrigerator etc. would keep switching on and off every fe

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