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.
Obtained from an Electronic Engineering of the 90s, these circuits can be applied to almost any...
Found on Popular Electronics from 1970, this circuit fires a xenon lamp producing a C1-dependent...
This diagram can serve as a reference for readers who want to know what an old oscilloscope with...