My temperature control circuit uses a 1k thermistor which i understand has a negative coefficient. This causes the relay to switch on when the temperture gets too cold.
However I need it to work the opposite way, so that when the temperature rises it swtiches the relay in the circuit on.
WIll this just be a case of changing the thermistor to a positive coefficient or will I have to do more tinkering (which I cannot afford to do at present) with the circuit.
Is there any other thing i could do? i basically need an electric fan to switch on when the temp rises
many thanks
However I need it to work the opposite way, so that when the temperature rises it swtiches the relay in the circuit on.
WIll this just be a case of changing the thermistor to a positive coefficient or will I have to do more tinkering (which I cannot afford to do at present) with the circuit.
Is there any other thing i could do? i basically need an electric fan to switch on when the temp rises
many thanks