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 uses matched transistors. The circuit is from Electronics Now magazine and has a...
This variable power supply circuit was found in a German publication from the 1980s. The circuit is...
The operational amplifier used in this circuit admits an equivalent, since the circuit is from old...