[sdiy] optocouplers/Vactrols

[Paul Higgins]

Hi all,

I was wondering what optocouplers (LED/LDR combo) list members prefer.  
I've certainly used the PerkinElmer (formerly EG&G/Vactec) Vactrols and 
have made some DIY models as well.  I'm waiting to see if I can get 
some samples of the Silonex (Audiohm) couplers.  I remember Hamamatsu 
(sp?) was mentioned on the list some time ago, but all I can find on 
their site is info on their LDRs (which of course would still be useful 
for DIY couplers).  I also know that I can get some of the Clairex LDRs 
from either Digi-Key or Mouser, I forget which.

I recall the response time being a potential issue with the Hamamatsu 
parts (as fast as OTAs/VCAs), whereas the Audiohm couplers seem to be 
in the same range as many of the Vactrol parts, maybe a bit slower.  
(Rise times for Audiohm parts seem to be in the 3-6 ms range).

Thanks,
-PRH