@raschemmel: what's wrong with you? I said it's for controlling camera focus & shutter.
which is why I said :
A camera shutter circuit is neither high speed or high current so it's sort of like asking what brand of peanut butter you should buy
which is the same as
Probably the easiest to get and cheapest.
do you see any difference between the two ?
Skippy or Jiff ?
If you are not going to post a schematic of your circuit we have no way to know if you know what changes you need to make to your circuit for the 4-channel optos. You only asked which to buy. You didn't ask what to change and you didn't say if you knew or didn't know how to design the circuitry for the 4-channel optos. Were you planning to use the same resistor values without doing any calculations ?
It would probably work , but it would be better to look up the specs and do the math.
The forward current is the same or close to the same for all three chips (4N35 and the other two)
If you are going to post here you might as well ask how to read the datasheet so next time you can figure it out for yourself. (if you want to learn)
There's nothing wrong with me. You are the one asking for help so you are the one who needs to tell us exactly what help you need. I asked you a simple question. Do you know how to read a datasheet ?
How am I supposed to know if you do or don't if you don't say so ?
You answered (in your own rather rude way) "NO" . So that being the case, how do you expect to use the 4-channel optos if you don't know what specs to look up and what to do with them. If you want help , tell us exactly what you need the help with. Asking us which to buy isn't going to tell you how to use it. If you know how , fine. If not , say so. we shouldn't have to play 20 questions here. You post should have stated:
"I need to switch from pair of single optos to a 4-channel opto chip. Here is my current circuit schematic using the 4N35. Which chip should I buy and what changes do I need to make to my circuit ?"