This circuit, which can be used as a shield, was found in General Electric documentation from the 1980s. The coupler uses a photo-SCR. The circuit admits equivalent components.
This 100-second timer was found in a 2000 Poptronics. The magazine no longer exists, but the...
This circuit uses a photocell as sensor and a sensitive relay according the power supply voltage....
USB58xx and USB59xx Devices Integrate a 2:1 Multiplexer to Support Reversible Connection of USB...