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0:11
YouTube
Electronics Education
Galvanic isolation using optocoupler
This circuit shows how a PC817 optocoupler provides electrical isolation between an HCT logic input and an isolated HCT output. The input signal drives the LED inside the optocoupler, producing a corresponding transistor output on the isolated side. R1 and R2 limit LED and collector current for safe operation. The 74HCT14 buffers and shapes the ...
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