This circuit was found in Motorola documentation from the 1980s. The components are of the time, not currently common as operational and opto receiver.
This circuit was found in an Electronics Now from the 90's. The integrated regulator circuit and...
This circuit is suggested by National Semiconductor in its Linear Applications Handbook. It makes...
The circuit shown is from the 1993 Motorola Linear Interface ICs. The power source may be common...