10 Aug '17, 8am

Convert Temperatures the Analog Way

Convert Temperatures the Analog Way

Everyone knows how to convert from Celsius to Fahrenheit, right? On a digital thermometer you just flick the little switch, on a weather app you change the settings, or if worse comes to worse, you let Google do the math for you. But what if you want to solve the problem the old-fashioned way? Then you pull out a few op amps and do your conversions analog style . We’ve seen before how simple op amp circuits can do basic math , and the equation that [Kerry Wong] wants to solve is even simpler. Recalling the old Tf = 9/5·Tc + 32 formula (and putting aside the relative merits of metric versus traditional units; we’ve had enough of that argument already), [Kerry] walks us through a simple dual op amp circuit to convert the 1 mV/°C output of a thermocouple module to 1 mV/°F. The scaling is taken care of by a non-inverting amplifier with resistors chosen to provide a gain of 1.8...

Full article: http://hackaday.com/2017/08/10/convert-temperatures-the-a...

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