Choice of optoisolator for interface?

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Choice of optoisolator for interface?

Hi All,

Im about to build an interface for WSPR etc, based on the KISS circuit elsewhere on this forum (designed by a VK, my appologies for forgeting who!)

This design calls for a 4N23 optoisolator. I dont have any of these, but i have an old UPS which contains 1x 4N33 photodarlington isolator, and 3x P521 isolators.

I would like to use one of these as i have them onhand. Can anyone tell me if there are likely to be any problems with using either of these types? As this is a simple switching arrangement i cant forsee any troubles, but then i have little experience in using optoisolators!

Any advice gratefully received,

Martin G7MRV