pedot

i dont have plan to swap tha thermistor with the 68k resistor... all i need is the operational of my circuit... i take it from internet... i want to know why all the resistor consist that value and may need some calculation and formula... i have to explain all that on my report project..

i`ve a problem that need your help to solve it.. here i attach the circuit.. fro this circuit,can u explain to me how it work.. maybe you can provide some calculation that tell why that we need to use 68k for r1,10k for r2 and etc.. also the relationship with the thermistor value(100k @ 25) let me tell you a little bit that i understand from this circuit.. The thermistor has a negative temperature coefficient (NTC) and when the temperature is high its resistance will be low. This causes the voltage at pin 2 of IC1 to be low. If pin 2 is below the set-point of VR1, the output at pin 6 will be high.. the output of the circuit will be connect to aalog to digital converter(ADC)..after the outpu has been converted i will use 8085 to program it to work.. any suggestion of application that i may use?