Anyone know anything about wiring up a thermistor (sp?)
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. -- \\\|/// ( @ @ ) -----------oOOo(_)oOOo--------------- oooO ---------( )----Oooo---------------- \ ( ( ) \_) ) / (_/ The original frugal ponder ! Koi-ahoi mates.... |
Anyone know anything about wiring up a thermistor (sp?)
do a search for "comparator" or "quad comparator", or even "op amp"
and you'll get a plethora of circuits -you need a voltage reference (a pot will do, you need a resistor and the thermistor in series (the junction of the two being the other feed to the comparator) and you need a stable power supply (get a 7805) - pretty simple, no? On Fri, 10 Mar 2006 03:58:22 GMT, (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. Bill www.wbnoble.com to contact me, do not reply to this message, instead correct this address and use it will iam_ b_ No ble at msn daught com *** Free account sponsored by SecureIX.com *** *** Encrypt your Internet usage with a free VPN account from http://www.SecureIX.com *** |
Anyone know anything about wiring up a thermistor (sp?)
There are a wide range of cars that have thermo switches mounted in the
radiator to do just this, what's wrong with copying the circuit from the car you pull the switch out of? They will already be suitable for 12 volts and are fairly weatherproof. You can also use the standard thermostat from a hot water system on 12 volts and they would carry enough current to stitch your fan. Might not have the vibration resistance if you wanted to use it on a car. They would also have to be mounted dry outside but in contact with the meal surface of the water holding "tank"? Cooking thermometers can be mounted to some items and there are ones that hook up to certain model ovens to turn off the element and maybe ring a bell when the roast is cooked. They will have a mounting that can be copied or transferred to almost any tank you might want to use, or inline with a plumbing fitting. Fishtank heaters have a thermostat and can be rewired to suit. There are other options, Hope this helps, Peter 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. -- |
Anyone know anything about wiring up a thermistor (sp?)
|
Anyone know anything about wiring up a thermistor (sp?)
|
Anyone know anything about wiring up a thermistor (sp?)
On Fri, 10 Mar 2006 03:58:22 GMT, the renowned
(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. What's the current rating on the fan? Is it an electronic BLDC type? Best regards, Spehro Pefhany -- "it's the network..." "The Journey is the reward" Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com |
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