opto couplers

[BJ]

Daniel Schouten wrote:
> 
> Hi all,
> 
> The last couple of weeks I'm busy making a midi interface with a
> PIC16C73, for one of my analog synth projects.
> The opto coupler I used in the first place was a CNY17-2 from QTC, which
> didn't work properly. After measurements I found out that this one was
> just to slow, because the rise and fall times at the transistor side
> were too long.
> After that I used the same type but from an other manufacturer (HP I
> think). This opto worked well.
> 
> My question is, which (low cost) opto is mostly used for midi
> applications? Maybe the CNY17-2 isn't really suited for this kind of
> stuff.
> 
> Thanks.
> 
> ____Daniel____
No the CNY17-2 are not well suited for this kind off operation
its to slow as you have recognised.

Many manufactures use 6N138 and the old  PC900 series and
i have seen infact a TIL 111 in som equipment.

Regards BJ