Need schematics for electronic thermostat 1

[zlatkodo]

I need schematics for small, simple, precise electronic thermostat for range 20- 80 gr. C, with Pt 100 or similar.
Can someone help me?
Thanks. Zlatkodo.

 

[7anoter4]

For the beginning see:

http://home.howstuffworks.com/home-thermostat3.htm

 

[7anoter4]

And better see:

http://www.ziehl.de/ziehl/englisch/temperature_monitoring/pt100temperaturrelais_e/tr400_e.pdf

 

[RobF]

There are a million different ways of doing what you're asking. You need to determine which is the best for your application. To get you started check out these:

http://www.maxim-ic.com/appnotes.cfm/an_pk/3965

http://focus.ti.com/lit/an/slaa129b/slaa129b.pdf

http://www.national.com/apnotes/Thermostat.html

http://www.zilog.com/docs/appnotes/an0206.pdf

There are LOTS more app notes out there since a thermostat is well understood and makes a great example.

Good luck.

Engineering Incredible Solutions

http://www.incredilution.com

 

[IRstuff]

IS this for school?

TTFN

FAQ731-376

 

[waross]

Hi IRstuff ;
Judging by zlatkodo earlier post, I think that he is years past homework. He may be speaking English as a second (or third or fourth) language. I don't think he is in an area where he can run down to a Home Hardware for an off the shelf thermostat. I suspect that he needs to build something that isn't available to him locally, even though it may be available to you or I.


Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[IRstuff]

I'm not questioning his language, just why he seems to be unable to use Google foe something that's presumably his livelihood.

TTFN

FAQ731-376

 

[GonzaloEE]

BTW, I made a thermostat for fixing my grandma's iron a lot of years ago. Used an old PIC16F870, a cheap NTC thermistor and a relay. Of course, the circuit itself was the easy part...The firmware (in assembler!) was the real fun.

 

[IRstuff]

I'd agree. Measuring "precise" temperature isn't necessarily challenging, but thermostatic control involves understanding, to some degree, the dynamics and transfer function of the system.

Precise thermostatic control requires much more understanding than "small, simple precise thermostat" describes.

Given that the OP still hasn't even described what the application is, how can anyone realistically answer the mail without knowing the complexity of the temperature control and plant part of "thermostat"?

TTFN

FAQ731-376

 

[zlatkodo]

Thank you for your advice. I have already received the appropriate scheme.
Zlatkodo