This circuit uses a heated filament as a sensor. With the air current it changes resistance, and the circuit detects it. The circuit is from a 1969 EEE.
May 2016 - It can be obtained from Mouser Electronics new microcontrollers from Texas MSP430...
This circuit is from a 1986 Revista Española de Electrónica. It consists of an amplifier with...
This differential amplifier with high input impedance is used in instrumentation. Other...