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hi bobp thanks for your advice. the site recommended by you is quite useful once again thank you. s.rajendran rajens@tr.dot.net.in

hi u can build on your own. use Lm 335 national temp sensor provides 10 mv/ deg k , use front end diff amp to scale to degc / degf then connect it to a dpm to read temp of your interest , i think usual full scale range for this device is up to 7o deg , check manufacturers data sheet .

ref to intersil or teledyne data book for icl 7107 31/2 digit dpm application notes where fully operational true rms ckt using opamp is detailed , if you ere not able to get on your oen mail me your e mail id for the circuit

hi, working with 555 is a fun , send yr schematic , i will fix it.