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Originally Posted by bojan
Any optocoupler will do. And they all have the same pin-out (The only difference between various types is the number of devices in the package, and type of receiver: transistor, darlington or FET).
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I have one or two 4n25 left along with some 470 ohms 1.4W resistors from "Palm" project and it seems that 4n25 has the same pin-out as 4n26. I've just looked at
the diagram I used to follow for a "Palm" cable and it looks almost the same except it does not have a LED and 330 ohms resistor part. I guess it won't hurt if I don't use them at all . At least I can add them later if I need this visual indication of the whole process :-)
Thanks a lot for this hint.
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You can even build your own optocoupler, using IR LED and phototransistor, properly aligned.....
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I'm not so good at this. I can solder it all together according to a diagram but it's the easiest part of the job.