This is a multi-part message in MIME format. ------=_NextPart_000_002D_01C37BE4.675FD700 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Hi EE, The output of an opto shows a 3us slope in both edges with a 4n26 in follow emitter configuration (not 4n32 as stand on the diagram). I've used this configuration to prevent signal inversion. Is it possible to reduce this slope? I worked around load impedance and capacitance, resistor form base to ground, etc. Or I just change the opto for another like 6n137. I'll appreciate any suggestion, Dennis. Ps: thanks Jinx for providing this *practical* Paintbrush Symbols Library! -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. 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