On Jul 11, 2010, at 6:12 PM, Mike Pepper wrote: > http://www.perkinelmer.com/CMSResources/Images/44-3429APP_AnalogOpticalIsolatorsAudioApps.pdf Interesting to compare and contrast this with the middle of: http://rubidium.dyndns.org/~magnus/synths/companies/buchla/Buchla_2590_4_200.jpg - Aaron