Figure 2 shows how to translate Figure 1’s math into a practical circuit, using to advantage what’s often thought of as a disadvantage of the classic Darlington topology. Figure 2 The flowrate sensor ...

Cs = still-air case-to-ambient conductivity = 6.4 mW/°C K = “King’s Law” thermal diffusion constant = 0.75 mW/°C/√fpm Sa = air speed in fpm. Figure 2 shows a practical thermal sensor circuit organized ...