Hi,
How to use 4N35 for getting tacho reading from a 48V Fan to a PIC microcontroller, The tacho output is open collector and can be upto 60VDC, PIC IO level is 3.3, will the switching speed be enough to read the tacho output correctly.
Regards
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Unfrotunately the 4n35 has been obsolete for a long time and no one is familar neither with the device nor your application.
A hint might be to search Avago's website for similar applications.
Sorry & good luck,
Thomas