NIbbels Posted March 10, 2005 Report Share Posted March 10, 2005 Hi I have made the schematic of the temp controlled fan.It works, but here is my question.You can set the starting temp of the fan.But is it also possible to tell @ a certain temp to stop the fan? Quote Link to comment Share on other sites More sharing options...
audioguru Posted March 10, 2005 Report Share Posted March 10, 2005 Hi Nibbels,Welcome to our forum.Which temp-controlled fan project did you make? We have 3 of them.Please "copy shortcut" then paste a link to it.Separate start and stop temps can be adjusted if you use a window comparator circuit. I think the circuits that control the speed of the fan are better, my new computer has one. I can faintly hear its fan speed-up a little when it is number-crunching. Quote Link to comment Share on other sites More sharing options...
NIbbels Posted March 10, 2005 Author Report Share Posted March 10, 2005 Hihere is the linkhttp://www.electronics-lab.com/projects/motor_light/025/index.htmlThe problem is that schematic is made for 230VACAnd I don't have any DC availble Quote Link to comment Share on other sites More sharing options...
audioguru Posted March 10, 2005 Report Share Posted March 10, 2005 Hi Nibbels,Yeah, that circuit pulses at 100Hz and doesn't have DC available either. It is a very simple circuit to control the speed of the fan with temperature changes, not to turn the fan on and off accurately.Have you tried changing the value of its C1? Quote Link to comment Share on other sites More sharing options...
NIbbels Posted March 10, 2005 Author Report Share Posted March 10, 2005 How much should I change it you think?And what would be the effect? Quote Link to comment Share on other sites More sharing options...
audioguru Posted March 10, 2005 Report Share Posted March 10, 2005 It is too simple to make changes. It would be better to design a circuit to do what you want. Quote Link to comment Share on other sites More sharing options...
NIbbels Posted March 10, 2005 Author Report Share Posted March 10, 2005 If I could design one,I would but I don't exact know how I would do it.That's why I started this temp control project.And start from there to go on and change to my needs, but it's not so easy :-\If you would have any ideas, they're welcome Quote Link to comment Share on other sites More sharing options...
steven Posted April 26, 2005 Report Share Posted April 26, 2005 :)you may find those thermal switches in microwave ovens helpfull these switch on or off, and circuit you use it in just apply the heat of a cigarrette lighter to the metal face of the thermal switch then listen for the click as it switches off the circuit or on. Quote Link to comment Share on other sites More sharing options...
Guest Alun Posted April 26, 2005 Report Share Posted April 26, 2005 NIbbels,Just a few questions:At what temperature to you want to turn the fan off?What temperature do you want the fan to turn on?Power supply?Sorry you confused me ??? AC/ DC, what voltage?You need a thermistor a special type of resistor that changes its resistance as the temperature changes. I would uses this as part of a potential divider, and use a comparator to turn a relay of transistor on/off. If you answer the above questions I'll design the circuit for you. Quote Link to comment Share on other sites More sharing options...
NIbbels Posted April 29, 2005 Author Report Share Posted April 29, 2005 Hi AlunI have made that project and it works with the 230VAC, I think the DC was just an error.The fan should turn on @ approx 40 Quote Link to comment Share on other sites More sharing options...
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