Abstract: An electrical control circuit for a constant temperature anemometer includes a first operational amplifier coupled to receive inputs from two intermediate terminals of the Wheatstone bridge, and to generate an output voltage in response to a difference in voltage between the intermediate terminals. A second operational amplifier receives the output voltage, and provides its output as a drive voltage to the Wheatstone bridge. The second operational amplifier also provides its output to a feedback loop which incorporates an A/D converter, a digital processor and a D/A converter. The amplifier analog output is converted to a digital signal. The digital processor calculates a digital offset value, based on a constant ratio of the digital offset value/digital signal, predetermined by selection and setting of the various control circuit components. The D/A converter converts the digital offset value to an offset voltage provided to the second operational amplifier as an input.