Found in a 90’s 303 Circuits, this circuit uses components that are still common and has a common LED as indicator.
Found in an 1868 Mullard documentation this circuit has a dynamic range of 10 Hz to 25,000 Hz....
This circuit generates interval signals controlled by a light sensor. The basic time of the sound...
A The adjustable Q-factor rejector filter in the figure is based on two LM110. These integrated...