This circuit was found in an old Linear Technology documentation. The working principle can be harnessed in modern designs with current components.
This circuit, used in radio communication, converts CW signals and tones that allow you to follow...
This circuit can generate signals in the range of 50 kHz to 500 kHz using appropriate crystal. The...
This circuit uses as a sensor a thermocouple to detect air flow. We found this circuit in a 1980s...