![]() So if there is something you haven't specified in the question, now would be a good time to do that. It is obvious from your drawing that V1 & V2 must share grounds to work, but not V3. Simulated below with quadrature rotary opto encoder. The 2nd choice, that I prefer is to replace Opto IS2801-4 with any NPN transistor The 1st obvious to me is to insert a transistor emitter follower to boost current, but that requires cuts & jumpers. There are many methods to boost current gain to logic levels yet the 24V output in not defined as a logic level nor the low-level tolerance. You don't need another opto-isolator do you? Solutions
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