The circuit in the figure is an amplifier with gain 10 for alternating signals using the 741. The circuit is from an article in the Radio Electroics magazine of May 1989.
This circuit is from a documentation from the 60s. The circuit can be built with transistors like...
Found in a 1966 General Electric documentation, this dimmer should only be used with incandescent...
To control relays safely with double insulation, we suggest the circuit in the figure. The optical...