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Op-Amp temperature controll circuit needed

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scream_er

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Hey guys, I need a circuit to control the temperature using op-amp. I dont want to use any programing since im fairly new to electronics. This is just my 2nd project. I just need to keep a heating strap within a particular temperature and off it manually. Thats all. Any help will be appreciated.
 

burningmosfet

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Please have a look to the circuit on page 7 fig. 11 on this doc:

**broken link removed**

Use Lt spice (free sw) to simulate the circuit

I forget to tell you that this circuit uses a cheap (altough non linear) NTC thermistor for temperature sensing.
 
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