DIYbanter - View Single Post - Anyone know anything about wiring up a thermistor (sp?)

In article ,
(Roy) wrote:

I want to make a electronic controller to turn a fan(3" muffin type)
when water temp reaches a certain temperature. I know they make water
proof or submersible thermistors, and there can't be too much to the
circuit as one company makes such a fan but its sensed with air temp
and I want water temp.......Fans are all 12 volt DC.. I owuld like to
turn on fan when water temp reaches 81 deg or so and off when it gets
back to about 79 or so degrees.

Any links on circuits etc appreicated or on how to figure out what
thermistors are needed.

For simple, you'd want a thermostat. Boring old bimetallics do a lovely
job at this sort of thing, and switch the power directly. Thermistors
and other (some both better and cheaper than thermistors) temperature
sensors involve a good deal more circuitry - not particularly difficult,
but a lot more complex than a thermostat.

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Cats, coffee, chocolate...vices to live by