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.
Found in National Semiconductor documentation from the 90s, this circuit makes use of components from...
This circuit was originally designed to measure capacitance with an ICL7107 but can be used with...
The TDA7000 is a Philips integrated circuit that contains a complete FM receiver with the need for...