Family datasheet spanning the 4N29 through 4N33 optocouplers, a 157 KB PDF listed in the schematic category. All of these are six-pin Darlington-output isolators that differ in guaranteed transfer ratio and isolation figures, so one table usually compares them side by side. For bench work it answers questions about pin assignment, base pin use, LED forward voltage and output saturation when diagnosing an isolated switching stage. Read the grade-specific limits before treating any two numbers as interchangeable.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @cyberlanelectonik. Enginerys does not host this file.
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The standard format for schematics, block diagrams, power-sequence charts and service manuals.