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These two circuits allow you to set the temperature at which the relay will energize and de-energize. COMMENTS SUGGESTIONS Two Temperature-Controlled Relays MORE CMOS CIRCUITS Construction Guide The Rest of Ron's Circuits Write To Ron More Free-to-Use Circuits Circuit Exchange International Click Here For A Detailed Circuit Description The first circuit energizes the relay when the temperature rises above the preset level. The second circuit energizes the relay when the temperature falls below the preset level. The two circuits are practically identical. The only difference between them is the polarity of the transistor. The value of the thermistor is not critical. The important thing is the voltage on pins 5 & 6. Any value thermistor should work satisfactorily. But you may need to change the value of R1 - to achieve the desired range of adjustment. ...
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