This circuit is suitable for the calibration of old analog oscilloscopes. It was found in documentation from the 1970s and could be useful if someone is recovering an oscilloscope of the time.
The oscillator in the figure has its frequency determined by the crystal. The indicated value is...
This circuit activates an incandescent lamp (or LEDs) when the light stops hitting the sensor, which...
This didactic circuit was found in a 2001 documentation. It automatically counts in an increasing and...