I took lesson microelectronic two years ago and i learnt a lot of thing, diode , transistor, kirchoff, gain etc...
My simple question is that when i searched simply temperature circuit on google, i see that there are a lot of circuits.. but i havent still understood how work it and how understand this circuit? for example how does it understand high temperature and low temperature...?

 

Are you trying to do something specific? Do you have a temperature range you need?Which circuits are you confused by?

 

1. I dont want ready circuit diagram, i want to design myself.
2. no
3. -5,+5 e.g. how can i design?

I'd like to help but I really can't understand what you want. Maybe someone else will understand better than I do.

Good luck.

 

There are components that change electrical characteristics as a function of temperature. An ordinary small signal PN junction diode like the 1N914 will change at about 1.8 millivolts per degree C. This is the same with base-emitter junctions of transistors and this sort of phenomenon can be exploited to measure temperature. Below are voltage vs current curves for the 1N914 at various temperatures.





Another component that changes in response to temperature changes are thermistors. You can find thermistors with pretty dramatic resistance vs temperature curves. The resistance as a function of current curves below are for a family of negative temperature coefficient thermistors. They also make them with positive temperature coefficients.



There are many phenomena in electronics that show chnage wiht temperature, thes are just two of the most common types.

 

thank you so much !!!!