This 9-pixel circuit has been implemented with 9 LDRs and can be coupled to a processing system for an elementary artificial eye. The circuit is from Radio Electronics, November 1986.
This circuit was found in a 1970s General Electric documentation. Transistors are uncommon today....
When the lights turns off this circuit will produce a sound like a cricket. When the lights are...
Found in National Semiconductor documentation this circuit converts a rectangular signal into an...