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.
This circuit was obtained from a 1966 documentation. The transistors are of the time. The circuit...
This precision rectifier circuit is suitable for applications in an AC / DC converter. We find it...
I found this circuit in a Popular Electronics from November 1999. The magazine is no longer...