Temperature Controller

i am thinkin of making a temperature controller..
if its set to heat the liquid (water) to 50c...then it should start heating it from room temp to the set point and as its about to reach the set point..instead of shutting the power off to the coil it should automatically decrease power to the coil so tht it remains constant at 50c

plz share any idea or circuitry if u guys hav

there is already a fan controller project which is of same nature, the only difference is you want high temperature and that project is for maintaining low temperature.

you control heater for temperature, and that project controls fan for same purpose. so almost everything is interchangeable.

Search in forum for Temperature controlled fan.

thanks ajay for providing me related info regarding my new idea
respect! !dance