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 is suitable for use in radio receivers to improve the quality of weak signal...
This power source was found in a Motorola manual from 1968. Transistors are from the era, and...
This circuit should be placed between a turntable and recorder or playback media from the input to...