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Circuit (Network) analysis is the process of finding the voltages across, and the currents through, every component in the network. Consider using in conjunction with tags for the particular analysis technique(s) in question: "nodal-analysis", "mesh-analysis", "superposition", etc.

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What is wrong with this relay circuit?

Your measurements say no current flow through the photo does in your photo isolator, you need to investigate why. A suggestion above re diode voltage drops may be the answer, or some other issue. More …
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