Temperature alarm circuit with 741 operational amplifier

This temperature alarm circuit with operational amplifier activates a relay when the temperature of the place to be controlled exceeds a set level. Useful for an oven temperature control or a cooling system

Over temperature alarm circuit using Thermostat

This alarm circuit uses the 67L080 thermostat (TH) and can be assembled easily, due to the small number of components required.

This circuit convert the sensed temperature by a thermistor into a voltage level. The circuit achieves an acceptable performance between 0°C and 24°C